DE19542804A1 - Comber outlet detaching pressure roller - Google Patents

Abstract

The pressure roller (36), to bear against a powered cylinder (32) at a textile machine and especially a comber, is driven by friction contact with the cylinder, with the gap between them acting as the working gap for the fibre material. The roller has a section (44) in contact with the fibre material, at least along the length (L) of the roller/cylinder gap, and further sections (46,48) of a material with increased friction are directly in contact with the drive cylinder (32), to transmit the rotary drive to the pressure roller (36). Preferably the high friction sections (46,48) have a larger diameter (D) than the roller diameter in contact with the fibre material, located at an end of the pressure roller (36) or both ends. The drive contact sections (46,48) are of a rubber elastic material. The roller section (44), in contact with the fibre material, is a hard and generally pore free closed mantle surface, with a lower friction resistance than the drive carrier sections (46,48). The roller surface (44) in contact with the fibre material is of dirt-resistant and/or wear resistant material round the surface, and is electrically conductive. The roller surface (44) can be coated. The pressure roller (36) body (50) is a hollow cylinder, with outer rings (46,48) for the friction drive transmission. The roller body (50) is of metal, and especially steel or aluminium, or it is of plastics, a compound fibre material, "Kevlar" (RTM: aromatic polyamide fibre), etc..

Description

The invention relates to a pressure roller for pressing a driven cylinder of a textile machine, in particular a combing machine, which pressure roller by friction is taken from the driven cylinder and with this working gap receiving a fiber material Are defined.

Such pressure rollers are used especially in spinning riding machines such as B. combers and lines puts. They each work with a driven cylinder together, which defines a working gap through which e.g. B. fiber material present in fleece form. While the driven cylinder is usually made of steel there are, the previously used pressure rollers in the Usually with a continuous cover made of rubber-elastic Provide material.

Especially with non-pulling pressure roller / cylinder pairs there is now a risk that fiber material around the Printing roller winds, which can lead to considerable malfunctions and usually requires the machine to be switched off. On such coiling is due, among other things, to that the fiber material contains dirt and sticky particles. Correspondingly, pollution occurs regularly Circumferential surface of the pressure roller. It also increases this risk of winding formation due to electrostatic charges increases. Wrapping is also caused by moisture increases. Finally, this is used for the pressure roller coating dete rubber material always relatively porous. Will this gummima material when pressing the pressure roller in the nip area miert, so it can in the neighboring areas to a public the pores, which tends to carry away Fibers is further increased.  

By painting the peripheral surface of the printing roller, this can The risk of winding formation is countered within certain limits will. The usual paint finishes, however, have a relative short lifespan. The pressure rollers must therefore be in relatively short intervals repeatedly sanded and to be repainted again.

The aim of the invention is to provide a printing roller of the beginning to create the type mentioned, in which the risk of winding bil is significantly reduced.

The object is achieved according to the invention in that the Printing roller in the longitudinal direction in at least one we considerably extending over the length of the working gap, roller section coming into contact with the fiber material and at least one, at least in the circumferential area Existing material, directly with the specified driven cylinder contacting driving section un is divided over which the printing roller is taken.

The drive cylinder is driven by the driven cylinder accordingly takes place via at least one locally limited, ie Right in contact with the driven cylinder take section that extends laterally along the length of the ar beitspaltes extending, in contact with the fiber material stepping roller section is arranged and from friction elevating material. Thus, according to the invention a separation of functions, which is that the entrainment the pressure roller is done to the side of the working gap while the fiber material is guided in the working gap. After that Fiber material can only be guided in the working gap the frictional resistance of the work length gap extending roller section arbitrarily small be. Which extend over the length of the working gap  de, coming into contact with the fiber material cut can thus be particularly hard, at least in have a substantial pore-free closed peripheral surface, which minimizes the risk of wrapping is reduced. It is therefore not a blending of the pressure roller required more. When using the fiction among other things also achieved that for constant cleaning of the pressure roller zen serving plush roller are cleaned less often got to. The printing roller according to the invention is of particular advantage Part especially with non-pulling pressure roller / cylin of pairs can be used where there is a risk of was the biggest.

The entrainment made of friction-increasing material suitably has a larger diameter than the roller contacting the fiber material cut. This becomes more frictional when the pressure roller is pressed on lifting material of the driving section as a rule compressed so that the working gap is at least smaller than the fleece thickness will. In this case, too, the fiber mat rial in the working gap, however, only and not also trans ported or driven. For example in the case the printing roller according to the invention is thus a combing machine preferably used as a tear-off roller on the outlet side.

Basically, it is conceivable only at one end of the Print roller a made of friction-increasing material Carrying section to be provided. However, is preferably on Such entrainment from both ends of the pressure roller cut arranged.

During the driving section at least in the area of Circumferential surface expediently made of rubber-elastic Material can exist, which has with the fiber material in  Contacting roller section preferably a hard, at least substantially non-porous closed perimeter area. After the pressure roller over the driving section is carried by the driven cylinder, the Rei Resistance of the circumferential surface with the fiber material contacting roller section arbitrarily small and in particular be smaller than that of the driver section, so that the material for this roller section or its Surface with a view to being as complete as possible Suppression of winding formation can be chosen freely. A dirt-repellent and / or wear is preferred solid material chosen to avoid electrostatic charges also advantageously electrically conductive can be. To achieve the desired surface finish the nature of the material coming into contact with the fiber material Roll section can also be coated accordingly be.

The roller body can, for example, be made of metal, in particular steel or aluminum. However, it is also a roller body made of plastic, fiber composite material, Kevlar or the like conceivable. With a preferred off guide variant, the roller body is uncoated and made Metal, especially steel, made. Exists the rollers body made of aluminum, so it can advantageously be anodized or be hard enamelled. For example made of aluminum existing roller body can also advantageously a coating of dirt-repellent and / or wear solid plastic such as in particular polytetrafluoroethylene Wear synthetic resin. In the case of a plastic coating this with electrically conductive material such as in particular Metal powder and / or graphite powder may be added.

Especially in the case of a roller made of aluminum however, the body is also a plasma coating, in particular  an oxide ceramic coating is possible. Here is before preferably an aluminum-titanium or a tungsten carbide Coating provided.

Is the entrainment made of friction-increasing material section also slightly toothed, so the pressure can pressure of the pressure roller can be reduced. The preferably as Ring-shaped driving section can on the roller body be pressed on. Is the take-along section rubber-elastic material, so it can also on the rollers body vulcanized. Basically it is too conceivable to stick the driving ring on the roller body.

After the pressure roller in the area with the fiber material contacting roller section only the radio tion of a simple guide, we can be manufactured considerably lighter and cheaper. So is provided according to a preferred embodiment, the Form the roller body as a hollow cylinder and via rotary bearings to be stored on a roller comb.

With the lighter construction of the press roll results a smaller moment of inertia, which reduces the entrainment facilitated and the transmission in question is protected.

The weight of the roller can be further adjusted by an appropriate Choice of materials, e.g. B. through the use of plastic, Kevlar and the like.

The hollow cylindrical roller body can for example over internal pivot bearing on a roller core or over preferably external pivot bearings in the lateral stock book sen or the like.  

Further advantageous embodiments are in the subclaims variants of the invention specified.

The invention is described below with reference to exemplary embodiments play explained with reference to the drawing; in this shows

Fig. 1 is a schematic, partly sectional fragmentary view of a combing head of a combing machine,

Fig. 2 is a schematic representation of an embodiment of the Auslaufseiten tear-off roller of the combing head shown in Fig. 1, and

Fig. 3 is a schematic, partially sectioned view of part of a further embodiment variant of a pressure roller.

The combing head 10 shown schematically in Fig. 1 comprises a Lich rotatable kontinuier by a driving motor not shown circular comb roller 12 carrying a circular comb segment 14, and a composed of a lower nipper 16 and a nipper knife 18 pliers assembly 20.

In the illustrated embodiment, the lower pliers 16 are hinged at their front end to front supports 22 which can be pivoted about the axis of the circular comb roller 12 . At the rear end, the lower jaw 16 is articulated on tong arms 24 which are pivotally arranged on a tong shaft 26 . The upper tongs 18 can be pivoted about an axis 28 with respect to the lower tongs 16 .

In addition, the combing head 10 given by way of example comprises two tear-off cylinders 30 , 32 , to each of which an upper tear-off pressure roller 34 and 36 is pressed. Only the tear cylinders 30 , 32 are driven. The tear-off pressure rollers 34 , 36 are entrained by the driven tear-off cylinders 30 , 32 by friction.

To be combing wad W is from a wadding 14, not shown, a bearing in the pliers 16 , intermittently rotating feed cylinder 38 supplied.

In Fig. 1 the pliers unit 20 is shown in the advanced, open position. In the retracted position, not shown, this is formed by the pliers 16 and the upper pliers 18 pliers unit 20 closed. In this closed state, it holds a forward end portion of the wadding W, a so-called fiber beard. This fiber beard is combed element 14 of the intended on the rotating circular comb roller 12 Rundkammseg. The pliers unit 20 is then moved into the advanced, open position shown. The tear-off cylinders 30 , 32 have now been rotated backwards by a predetermined angle in order to let the rear end section of the previously combed sliver F from the clamping point between the tear-off cylinder 30 and the tear-off pressure roller 34 emerge towards the rear to the forceps unit 20 . The fiber combed from the round comb segment 12 is placed on this end section and pulled together with this back into the nip between the tear-off cylinder 30 and the tear-off pressure roller 34 . For this purpose, the Abreißzylin the 30 , 32 again rotated forward, wherein they are rotated by a predetermined angle, the larger, z. B. about dop pelt is as large as the aforementioned predetermined angle. The combed fiber beard is thus torn off from the cotton wool W lying in the pliers assembly 20 . At the same time, it is pulled through a fixed comb, not shown.

During each comb game, the tear-off cylinders are closed next by the smaller predetermined angle backwards and then rotated forward by the larger predetermined angle, which results in a so-called pilgrim step movement.

While with the combed sliver F pulling the cylinder / roller pair 30 , 34 there is practically no risk of winding formation, the non-pulling cylinder / roller pair 32 , 36 must be reckoned with when using a conventional upper tear-off roller with a continuous rubber coating that fibers get caught on this tear-off pressure roller 36 and are wound onto it. This is due, among other things, to dirt and sticky particles and electrostatic charges contained in the fiber material. Moisture also plays a role here. In addition, when rubber-elastic material is compressed, pores may open in the areas adjacent to the pressure points, which further increases the tendency of fiber material to be carried along.

In order to counteract this tendency of the winding formation, the front, outlet-side tear-off pressure roller 36 of the combing head 10 shown in FIG. 1 is designed according to the invention as described below with reference to FIGS . 2 and 3.

Referring to FIG. 2, the portion with two end pins 40, 42 provided from tear-pressure roll 36 in the longitudinal direction in an at least substantially over the length L erstre the working gap-bridging, passing with the fiber material into contact with rollers 44 and two provided at the two ends, from friction-increasing material existing driving sections 46 , 48 divided, which directly with the driven Abreißzy cylinder 32 (see FIG. 1) come into contact.

The two driving sections 46 , 48 made of friction-increasing material have a larger diameter D than the roller section 44 (diameter d) coming into contact with the fiber material. The two diameters D and d can differ by a few tenths of a millimeter. For example, the difference can be 0.8 or 0.4 mm. The driving sections 46 , 48 can be formed by driving rings made of rubber-elastic material. It is important that these driving sections 46 , 48 are located outside of the zen section 44 coming into contact with the fiber material and the tear-off pressure roller 36 is driven by the tear-off cylinder 32 via this friction-increasing he driving sections 46 , 48 .

In the embodiment shown in Fig. 2 36 annular Mitnahmeab sections 46 , 48 are provided at both ends of the tear-off roller. In principle, however, it is also conceivable to use only such a driving ring.

The driver sections 46 , 48 forming, preferably made of rubber-elastic material driving rings NEN can be pressed onto the roller body 50 or vulcanized. They can also be glued to the roller body. In addition, they can be slightly toothed, whereby the pressure on the tear-off roller 36 is reduced.

While the tear-off pressure roller 36 is taken over by the friction sections of the material-carrying sections 46 , 48 by means of friction, the roller section 44 coming into contact with the fiber material merely takes on the function of simply guiding the fiber material. The roller body 50 and in particular the roller portion 44 coming into contact with the fiber material can therefore in particular in the circumferential region consist of a different material than the driving portions 46 , 48 . It is therefore not neces sary to manufacture the roller section 44 from rubber-elastic material or the like. The mate rial in question or a possible coating can now be chosen so that the risk of winding formation is practically excluded.

Thus, the roller section 44 coming into contact with the fiber material can in particular have a hard, at least essentially pore-free, closed surface. The roller body 50 of this tear-off pressure roller 36 is thus be different than the tear-off pressure roller 34 , which together with the driven tear-off cylinder 30 must pull the combed sliver F from. Such peeling is not necessary in the area of the tear-off roller 36 . A guide of the fiber material or the sliver F is sufficient here, so that the frictional resistance of the roller section 44 of the tear-off pressure roller 36 is less than that of the corresponding roller portion of the tear-off pressure roller 34 and in particular can be as small as desired.

The Walzenab coming into contact with the fiber material section 44 of the non-pulling outlet-side contact pressure roller 36 consists at least in the region of the peripheral surface of dirt-repellent and / or wear-resistant material. It is expediently also electrically conductive, at least in the region of its peripheral surface, as a result of which electrostatic charges are avoided.

After the roller section 44 only has to take on a guide function, the roller body 50 can also be made lighter and therefore cheaper overall. It can in particular be designed as a hollow cylinder, as shown in FIG. 3.

In the tear-off roller 36 shown in Fig. 3 ', the hollow cylindrical roller body 50 via internal rotary bearings 52 (only one shown) is supported on a roller core 54 . The ends are sealed by a respective sealing ring 56 .

The hollow cylindrical roller body 50 can, for example, also be mounted in lateral bearing bushes via preferably external pivot bearings.

Due to the hollow cylindrical roller body 50 there is a much lower moment of inertia, which makes it easier to take along. This also relieves the load on the transmission.

Due to the displacement of the frictional drive, the tear-off roller 36 and 36 'and the fulfillment of a pure guide function in the region of the roller section 44 coming into contact with the fiber material practically no deflection occurs. The corrugated tear-off cylinder 32 therefore no longer needs to be ground conically, which results in lower manufacturing costs. These are also reduced in that the tear-off pressure roller 36 can be made lighter and in particular as a hollow cylinder.

A hollow cylindrical roller body is expediently provided per 50 , onto which drive rings (drive sections 46 ), preferably made of rubber-elastic material, are placed (see FIG. 3).

The preferably hollow cylindrical roller body 50 can for example consist of metal, in particular steel. In this case it can be uncoated.

The roller body 50 can also consist of aluminum, for example. It is also conceivable to manufacture the roller body from plastic, fiber composite material, Kevlar or the like.

The roller body 50 can in particular also be coated in order to achieve the desired surface quality.

In the case of a roller body made of aluminum this can be anodized or hard enamelled, for example. He can also be a coating of dirt-repellent and / or wear-resistant plastic such as especially Polytetra Wear fluorethylene resin.

With such coatings it is achieved that the upper surface harder and the frictional resistance becomes lower.

A coating made of plastic can with electrically conductive material such as metal powder in particular and / or graphite powder.

Especially in the case of a preferably hollow cylindrical one From the outset, aluminum roller bodies can also be used electrically conductive coating may be provided. Here is preferably a plasma coating, especially one Oxide ceramic coating possible.

This coating can, for example, be an aluminum-titanium or a tungsten carbide coating.

In any case, the entrainment sections 46 , 48 , which are made of friction-increasing material, may preferably be formed in turn by entrainment rings made of rubber-elastic material, which are advantageously pressed onto the preferably hollow cylindrical roller body 50 , vulcanized or glued on.

In the embodiment shown in FIG. 3, the hollow cylindrical roller body 50 has a smaller wall thickness in the region of the driving section 46 formed by a ring, so that a step 58 is formed, through which the receiving ring is positioned exactly. The same applies to the other end. In principle, however, it is also conceivable to provide a driving ring only at one roller end.

As can be seen in FIG. 3, the roller core 54 protrudes from the hollow cylindrical roller body 50 at the ends.

If the end pins 40 (see FIG. 2) or the roller core 54 are made of metal, then electrostatic charges can be derived directly from the end pins 40 or the roller core 54 to the machine frame. It is only necessary to ensure an electrical connection between the pin or the core and the preferably electrically conductive surface of the roller body 50 . If the end pins 40 or the roller core 54 are made of non-conductive material, these can be provided with an electrically conductive coating.

The rotary bearing 52 of the embodiment shown in FIG. 3 can be lubricated via lubrication channels (not shown) provided in the roller core 54 .

Reference list

10 combing head
12 round comb roller
14 circular comb segment
16 pliers
18 top pliers
20 pliers unit
22 front supports
24 gun arms
26 pliers shaft
28 axis
30 tear-off cylinders
32 tear-off cylinders
34 tear-off pressure roller
36 , 36 ' tear-off roller
38 feed cylinders
40 end pins
42 end pins
44 roller section
46 Driving section
48 Take-along section
50 roller bodies
52 pivot bearings
54 roller core
56 sealing ring
58 level

D diameter
d diameter
F combed sliver
L length
Cotton wool

Claims (26)

1. Pressure roller for pressing against a driven cylinder ( 32 ) of a textile machine, in particular a combing machine, which pressure roller ( 36 , 36 ') is taken by friction from the driven cylinder ( 32 ) and with this defines a fiber material-receiving working gap, thereby characterized in that they come into contact in the longitudinal direction in an at least substantially over the length (L) of the working gap, with the fiber material, the roller section ( 44 ) and at least one, at least in the peripheral region made of friction-increasing material, directly with the driven one Cylinder ( 32 ) contacting driving section ( 46 , 48 ) is divided under, over which the pressure roller ( 36 , 36 ') is taken along. 2. Printing roller according to claim 1, characterized in that the driving portion ( 46 , 48 ) consisting of friction-increasing material has a larger diameter (D) than the roller portion coming into contact with the fiber material. 3. Printing roller according to claim 1 or 2, characterized in that the entraining section ( 46 , 48 ) made of friction-increasing material is provided at one end of the printing roller ( 36 , 36 '). 4. Pressure roller according to claim 3, characterized in that at both ends of the pressure roller ( 36 , 36 ') each have a driving section made of friction-increasing material ( 46 , 48 ) is provided. 5. Printing roller according to one of the preceding claims, characterized in that the driving section ( 46 , 48 ) consists of rubber-elastic material at least in the region of the peripheral surface. 6. Printing roller according to one of the preceding claims, characterized in that the roller portion ( 44 ) coming into contact with the fiber material has a hard, at least substantially pore-free, closed peripheral surface. 7. Printing roller according to one of the preceding claims, characterized in that the roller section ( 44 ) which comes into contact with the fiber material has a lower frictional resistance in the region of the peripheral surface than the driving section ( 46 , 48 ). 8. Printing roller according to one of the preceding claims, characterized in that the roller section ( 44 ) coming into contact with the fiber material consists at least in the region of the peripheral surface of dirt-repellent and / or wear-resistant material. 9. Printing roller according to one of the preceding claims, characterized in that the roller portion ( 44 ) coming into contact with the fiber material is at least in the region of the circumferential surface electrically conductive. 10. Printing roller according to one of the preceding claims, characterized in that the roller portion ( 44 ) coming into contact with the fiber material is coated. 11. Printing roller according to one of the preceding claims, characterized in that the roller section ( 44 ) coming into contact with the fiber material by a preferably hollow cylindrical roller body ( 50 ) and the Mitnahmeab preferably cut by a carrier ring ( 46 ) carried by the roller body ( 50 ) 48 ) is formed. 12. Printing roller according to claim 11, characterized in that the roller body ( 50 ) consists of metal, in particular steel, or of aluminum. 13. Printing roller according to claim 11, characterized in that the roller body ( 50 ) consists of plastic, fiber composite material, Kevlar or the like. 14. Printing roller according to one of the preceding claims, characterized in that the roller body ( 50 ), which preferably consists of aluminum, is anodized or hard enamelled. 15. Printing roller according to one of the preceding claims, characterized in that the preferably aluminum roller body ( 50 ) carries a coating of dirt-repellent and / or wear-resistant plastic such as in particular polytetrafluoroethylene synthetic resin. 16. printing roller according to claim 15, characterized, that the plastic coating with electrically conductive material such as in particular Metal powder and / or graphite powder is added. 17. Printing roller according to one of claims 1 to 13, characterized in that the preferably aluminum roller body ( 50 ) carries a plasma coating, in particular an oxide ceramic coating or a coating of aluminum oxide and Teflon. 18. printing roller according to claim 17, characterized, that the coating is an aluminum-titanium coating is. 19. Printing roller according to claim 17, characterized, that the coating is a tungsten carbide coating is. 20. Printing roller according to one of the preceding claims, characterized in that the driving section ( 46 , 48 ) consisting of friction-increasing material is additionally slightly toothed. 21. Printing roller according to one of the preceding claims, characterized in that the driving ring forming the driving section ( 46 , 48 ) is pressed onto the roller body ( 50 ). 22. Printing roller according to one of the preceding claims, characterized in that the preferably made of elastic material driving ring ( 46 , 48 ) is vulcanized onto the roller body by ( 50 ). 23. Printing roller according to one of the preceding claims, characterized in that the driving ring ( 46 , 48 ) is glued to the roller body ( 50 ). 24. Printing roller according to one of the preceding claims, characterized in that the hollow cylindrical roller body ( 50 ) is mounted on a roller core ( 54 ) via preferably internal rotary bearings ( 52 ). 25. Printing roller according to one of the preceding claims, characterized in that the hollow cylindrical roller body ( 50 ) is mounted in side bearing bushes via preferably external pivot bearings. 26. Use of the pressure roller according to one of the preceding claims as an outlet-side tear-off pressure roller ( 36 , 36 ') in a combing machine.