Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
  • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
  • D01H5/70—Constructional features of drafting elements
  • D01H5/74—Rollers or roller bearings
  • D01H5/80—Rollers or roller bearings with covers; Cots or covers

Definitions

• the invention relates to a roll stretching apparatus for spinning machines in which the lining for the printing rollers consists of an outer and an inner layer and the outer layer is thinner than the inner layer, and a strapping or sleeve for use as a covering for printing rolls of such stretchers for spinning machines the thinner-walled outer layer loosely surrounds the thicker inner layer, so that the outer layer can move relative to the inner layer.
• the drafting roller pairs consist of a corrugated steel cylinder, the so-called. Sub-cylinder, and a pressure roller, the so-called. Upper roller, which is pressed onto the steel cylinder by load.
• This pressure roller usually has an elastic coating, so that no nipping line is formed, but by the deformation of the elastic pad a clamping surface, which causes a much better fiber retention.
• soft roller coverings result in better distortion results, since the clamping surface is the greater, the softer the covering is.
• the soft roll coverings have the disadvantage that they wear out very quickly and, in particular, form grooves in the area of the fiber passage. This so-called “shrinkage” is eliminated by sanding the entire surface of the pavement. As a result, the geometry of the drafting roller and thus also the properties of the lining change, which in turn adversely affects the drafting ratios and thus the yarn values.
• the regrinding of the roll covers is also a rather expensive measure.
• the elastic sheath is divided into at least two layers, wherein the outer layer is formed as an elastic sheath of a thin tube, which can be mounted on the elastic jacket of the printing cylinder.
• the formation of the outer layer as a tube allows a slight coating of the elastic jacket and also a slight stripping of this, when this outer peripheral surface is worn.
• the fitting of the elastic hose is ensured by the natural friction between rubber and rubber.
• a covering for drafting rollers of spinning machines is known, which is composed of two superimposed cylindrical layers, wherein the outer layer is harder and thinner than the inner layer. The two layers are glued together. As a result, very different materials can be combined with one another in order to avoid clogging and electrostatic charging. However, it has been found that the problem of good delayability and wear could not be solved satisfactorily. By bonding the changing of the outer layer is also expensive.
• the object of the invention is to eliminate these disadvantages and to find a roll covering, which has a high resistance to wear and permanent elasticity in the overlay and thus ensures optimal draft conditions over a long period. This object is solved by the features of claim 1.
• the outer layer is adapted on its outer side as a fiber contact layer to the requirements of a good fiber clamping and on its inside as a running layer as smooth as possible, low-friction running of the pressure roller.
• This is achieved, for example, in a simple manner by selecting appropriate material compositions for the fiber contact layer and the overlay of the outer layer.
• This outer layer can be designed both as a sleeve around the inner pressure roller as well as an endless belt. It merely needs to be flexible enough to accommodate the deformation of the soft inner layer. It has proved to be particularly advantageous to form the outer layer in the running direction of the chamfering / banding, ie, as inelastic as possible transversely to the roll axis, ie, with little stretch.
• the outer layer can adapt to the unevenness of the Fase ⁇ terbandes. It is achieved in this way an excellent clamping.
• a thread insert By means of a thread insert, the desired reduction in the elongation of the outer layer transversely to the pressure roll axis is achieved particularly well without restricting the extensibility in the direction of the roll axis. Due to the smoothest possible surface Before the running layer of the outer layer, the relative movement between the outer layer and the inner layer are favored and, as a result, the reduction of the tension forces is promoted even better.
• an outer layer formed as a strap For a high delivery speed, it is expedient to use an outer layer formed as a strap and to guide this strap through a deflection rail. In addition, this deflector still have side rims for safe guidance. At high delivery speeds, it has also proved to be particularly advantageous for trouble-free operation when the apron runs at an angle ⁇ > 30 ° to the plane of the fiber structure of the pressure roller.
• the strap suitably consists of several layers, wherein the inside is formed as a smooth running layer, the outside as a fiber contact layer. Between the layers, a thread insert is provided, which prevents the stretching in the direction of the strap, without affecting a desired transverse strain.
• FIG 1 shows the construction of the two-layered structure according to the invention
• FIG. 2 shows a cross section through the device according to FIG. 1.
• Figure 3 the execution of the outer layer as a strap.
• Figures 4 and 5 show schematically the structure of the outer layer with an insert for stiffening in the direction transverse to the axis of the cylinder. 6 shows the leadership of the strap by means of a deflection rail in
• FIG. 7 is a plan view of FIG. 6.
• a pressure roller 3 is arranged above the drafting cylinder 5, which has a covering 2 which is firmly connected in the usual way with the pressure roller 3.
• the drafting cylinder 5 and the pressure roller 3 form the pair of output rollers of a drafting system, which runs according to the delivery at high speed.
• another covering 1 is provided as an outer layer.
• This outer layer consists in the embodiment shown here of a thin-walled sleeve 1 made of flexible material, which behaves almost without stretch in the running direction of the sleeve 1 relative to the material of the inner layer 2.
• This sleeve 1 is loosely placed over the inner layer 2 of the pressure roller 3, so that a gap 6 can form in the non-loaded area between the inner and outer layers. It is essential that the sleeve 1 can move relative to the inner layer 2 of the pressure roller 3.
• the inner layer 2 however, as usual firmly mounted on the pressure roller 3. Under the load of the pressure roller 3, the soft inner layer 2 is pressed onto the drafting cylinder 5 and deformed, so that no linear contact with the drafting cylinder 5 takes place, but a surface support takes place. Since the outer layer 1 is thin and flexible, it adapts to the deformation of the inner layer 2, without itself being significantly compressed. In the case of the outer layer 1, therefore, no appreciable flexing work is performed in contrast to the inner layer.
• the clamping surface generated by the deformation of the inner layer 2 is passed through the outer layer 1, so that the intended for the delay fiber structure F is clamped by means of this clamping surface when passing through the pair of rollers 3 and 5.
• a clamping surface is formed by the soft elastic coating, which produces a good clamping action. Due to the flexing of the lining, however, tension forces arise in the area of the clamping surface, which have a negative effect on the fiber structure during warpage and also cause the known high wear of the lining.
• the outer layer is designed as a cylindrical sleeve 1.
• a cylindrical sleeve 1 can also be carried out as a longer endless loop.
• Both this cylindrical sleeve 1, as well as a Dressing 10 or 100 can be replaced easily in the case of wear or a groove formation in the area of the fiber structure F.
• a Endlosriemchen 10 is shown, which surrounds the pressure roller 3 with its soft, elastic inner layer 2 and is guided by a deflecting rail 4.
• the training as a longer Endlosriemchen 10 or 100 and its leadership by means of the deflection rail 4 has proved to be particularly advantageous when high delivery speeds are driven.
• the drafting rollers 3 and 5 forming the pair of delivery rollers run approximately 20 to 30 times faster than the pairs of rollers arranged in front of the main drafting zone, which are usually surrounded by fiber guiding aprons.
• These known Faser enclosuresriemchen have proved to be unsuitable for use as outer layer 1 on the pair of output rollers 3 and 5.
• These straps are inadequate in their properties. For example, it has been shown that it is important that the outer layer 1 or the strap 10 or 100 in the running direction of the fiber structure F, d. H. transverse to the roll axis 31 is as inelastic as possible, so that it can not stretch.
• FIG. 4 shows the construction of an outer layer 1, 10 or 100 in cross-section, which is specially designed for these desired properties.
• the outer layer formed as sleeve 1 or elongated endless strap 10 or 100 is expediently composed of several layers: a fiber contact Layer 101 and a running layer 102. Between the two layers 101 and 102, a thread insert 103 is arranged to eliminate the elongation in the longitudinal direction, which is fixedly connected both to the fiber contact layer 101, as well as with the running layer 102.
• the fiber contact layer 101 is designed in its surface and in its material for contact with the fiber structure F for receiving the necessary during delay retention forces. This is achieved, for example, by using a material such as is used for pusher covers.
• the running layer 102 is provided with a smooth, surface-promoting surface in order to allow the inner layer 2 to move relative to the outer layer 100, 10 or 1.
• a slip-promoting material is preferably used for the running layer 102, as is used, for example, for the known straps for guiding the fibers in the main drafting zone.
• the thread insert 103 takes the strap 100 in the direction of elasticity, so that an elongation is practically impossible. Transversely to the running direction, that is, in the direction of the pressure roller axis 31, however, the extensibility remains.
• the strap can be adapted to the unevenness of the warped Fase ⁇ / Erban- F, so that always a good clamping is guaranteed.
• a total thickness of 0.8 to 1.0 mm has proven very good both in terms of stability and distortion results. Even after several years of running, no groove formation (inlet) could be detected.
• the desired properties of the overlay 102 and the fiber contact layer 101 can also be achieved by appropriate physical design of the surfaces.
• the running layer 102 and the fiber contact layer 101 of different materials which have the desired sliding properties or the necessary "Gripp". Measurements according to DIN 53375 have shown that, for example, the material described above for the fiber contact layer 101 has a frictional force value which is at least twice as high as the frictional force value of the material of the overlay 102, if this consists of a material, as is the case for straps Fiber guide is used in the main drafting field.
• the running layer 102 thus has good sliding properties, while the fiber contact layer 101 causes an excellent clamping of the fibers.
• a strap 100 is guided through a deflecting rail 4.
• the deflecting rail 4 is not only rounded, but additionally provided with a low-friction coating.
• a cage 42 connects with guide rims 41.
• the apron 100 runs away from the drafting roller 3 at an angle ⁇ with respect to the plane of the fiber structure F. As a result, turbulence and flight formation in the exit region of the fiber structure F are avoided.
• the cage 42 is supported on the support rail 44 via compression springs 43, so that the deflection rail 4 exerts a tension on the strap 100.
• the side walls 41 serve for the lateral guidance of the strap 100. In this embodiment, a quick and easy replacement of the strap 100 is possible. By pushing back the deflection rail 4, the strap 100 is relieved and can easily be lifted over the side walls 41. This side walls 41 are used in addition to the encapsulation of the space between the pressure roller 3 and deflecting rail 4 for lateral guidance of the strap 100. If the outer layer 1 of the pressure roller 3 is arranged asymmetrically to the fiber structure F, the outer layer 1 can be turned so that the left side itself located on the right side and thus the Fasenterband F runs over an unused surface of the outer layer.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Laminated Bodies (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2002
  • 2002-12-19 DE DE10260025A patent/DE10260025A1/de not_active Withdrawn
• 2003
  • 2003-12-17 DE DE50312437T patent/DE50312437D1/de not_active Expired - Lifetime
  • 2003-12-17 US US10/539,182 patent/US7140172B2/en not_active Expired - Fee Related
  • 2003-12-17 AT AT03785849T patent/ATE458075T1/de not_active IP Right Cessation
  • 2003-12-17 AU AU2003294876A patent/AU2003294876A1/en not_active Abandoned
  • 2003-12-17 CN CN200380106757.9A patent/CN1729323B/zh not_active Expired - Fee Related
  • 2003-12-17 EP EP03785849A patent/EP1576217B1/fr not_active Expired - Lifetime
  • 2003-12-17 WO PCT/EP2003/014369 patent/WO2004057072A1/fr active Application Filing
  • 2003-12-17 JP JP2004561323A patent/JP4454501B2/ja not_active Expired - Fee Related
  • 2003-12-17 ES ES03785849T patent/ES2338546T3/es not_active Expired - Lifetime

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