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
  • D01H5/86—Aprons; Apron supports; Apron tensioning arrangements
• • 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
  • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons
• • 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
  • D01H5/72—Fibre-condensing guides

Definitions

• the invention relates to a drafting system for spinning machines with a downstream compression device, in which the compression of a warped fiber structure takes place by means of a flexible belt which has a perforation track made of compression holes and which has a fixed suction opening with a width greater than the diameter of the compression holes, transverse to the direction of travel of the fiber structure is guided, wherein compression holes with different extensions in the direction transverse to its running direction can be provided and wherein the compression of the fiber structure takes place by means of the compression holes having the least transverse extension.
• Such a drafting system is known from DE 43 23 472 A1.
• the diameter of the compression holes is to be selected depending on the fineness of the fiber structure to be compressed.
• the combination of the fiber structure can be varied by varying the intensity of the suction air flow.
• the degree of compaction of the fiber structure is determined by those holes whose transverse extent is the least and which thus as the compression holes are to be addressed.
• the holes with a larger transverse extent serve to guide fibers from further into the area of the compression holes causing the actual compression.
• the densification of the fiber structure affects several aspects of the spinning process or the yarn produced.
• a high degree of compaction with regard to the spinning process reduces, among other things, the loss of splitting off edge fibers and thus the flying not only of the ring spinning machine, but also of downstream machines such as the winding machine.
• a high degree of compression in particular reduces weight loss due to lost edge fibers, increases the tensile strength of the game by evenly integrating core and edge fibers and reduces its hairiness - the yarn appears slimmer. It has been shown that in some cases great weight is attached to one effect, but another is less desirable to the extent given.
• the object of the invention was therefore to specify a possibility with which the compression effect can be defined and influenced in a reproducible manner.
• the transverse extent of the compression holes can thus be increased or decreased and / or their mutual spacing increased or decreased.
• the contour of the compression holes can be retained, that is, such larger diameters can be used instead of circular compression holes of smaller diameter. But it is also possible to change from circular compression holes to those with an elongated round or oval contour, which lie transversely to the direction of the strap. Elongated round or oval contours have the advantage that they have a smaller cross-sectional area than circular compression holes of the same transverse extent and their air throughput is accordingly lower.
• straps In addition to compression holes with a small transverse extension, straps often have further holes with a larger transverse extension that do not have the extent of the compression determine. To change the compression effect, it is sufficient to change the transverse extent of only the compression holes.
• the degree of compression of a fiber structure of a given fineness can be selected in a defined manner. If, for example, the hairiness causing a 'fluffy feel of a textile fabric (knitted fabric, knitted fabric, fabric) is not to be eliminated to the maximum possible extent, a strap with a perforation which is in itself intended for a coarser fiber structure can be used. This eliminates the possible maximum compression and reduces the degree of compression achieved.
• the straps can differ with different perforations in the diameter of the compression holes or in their mutual spacing or in a combination of these possibilities.
• a reduction in the degree of compression can be achieved through compression holes with a larger transverse extension or a larger mutual distance or both a larger transverse extension and a larger mutual distance.
• Figure 1 is a schematic side view of a drafting device with a compression device.
• Figure 2 shows an apron for high compression with small compression holes in a view from below.
• Fig. 6 an apron for high compression with alternating holes smaller. and greater transverse extension
• FIG. 7 shows an apron starting from that of FIG. 6 for lower compression, for which the holes with a smaller transverse extent, that is to say the compression holes, are enlarged;
• FIG. 8 shows an apron starting from that of FIG. 6 for lower compression, for which the compression holes have been given a greater transverse extent
• FIG. 1 shows a drafting system 1 for a spinning machine for bundling a fiber structure warped in the drafting system.
• the drafting system has three pairs of rollers 2, 3 and 4 in the running direction of the fiber structure, 3 upper and lower straps 6, 6 'being assigned to the rollers of the middle pair of rollers.
• Downstream of the pair of output rollers 4 is a compacting device 7, which comprises a driven lower roller 5 'running through the length of the machine and an upper roller 5' 'pressed by spring force against the lower roller, as well as an endless, flexible strap 8 which wraps around the upper roller also wraps around a suction shoe 9 facing the pair of exit rollers 4, which is connected via a pipe or hose line 10 to a vacuum source, not shown here.
• the suction shoe 9 is opposed by a cover plate 11 at the bottom.
• a deflection rail 12 arranged in a cage 13, which brings it close to a scraper ruler 14. Fibers stripped here are sucked into a thread break suction pipe 15 and removed
• the strappy 8 has, in the center around its circumference, one, possibly also two, pearl-string-like perforations of compression holes, through which air is sucked in via a suction opening 16 in the suction shoe 9 during operation of the device.
• the starting point is an apron 8, according to FIG. 2, which is provided with compression holes 17 1 of small diameter d and a small mutual distance a 1 for maximum compression of a fiber structure 18 of certain fineness.
• the diameters and the mutual distances between the compression holes are not shown to scale in the figures of the drawing.
• the fibers of a fiber bundle 18 supplied by the upstream pair of rollers 4 in width b 1 are essentially - by the air sucked in laterally to the holes 17 1 - to the roughly the diameter d of the compression holes, as indicated by the arrows.
• the corresponding width b 2 is brought together and fed in this width via the roller pair 575 "to a downstream rotation zone (not shown here). At the outlet of the roller pair 575", no or only a very small spinning triangle is formed with the advantages known for this.
• an apron 8 2 with compression holes 17 2 with a larger diameter d 2 can be used according to FIG.
• the fiber structure 18 is only brought together essentially to the width b 3 corresponding approximately to the diameter d 2 of the compression holes 17 2 .
• a slightly larger spinning triangle then appears and the other advantages of compression are not fully achieved. But the yarn produced has the desired higher hairiness.
• a reduction in the compression effect can also be achieved in that, according to FIG. 4, an apron 8 3 with an increased mutual spacing a 2 of the compression holes 17 3 is used.
• a compression by the air sucked into the compression holes 17 3 takes place only at these compression holes.
• this compression also has an effect on the region of the fiber structure 18 lying between them with increasing distance from the compression holes 17 3 . It is obvious that this reaching out of the compression over the compression holes 17 3 becomes smaller the greater their mutual distance a 2 becomes.
• D 1 and d 2 denote the diameters of the (circular) compression holes in the figures. It is understood that the transverse extension of the compression holes in the direction transverse to the running direction of the compression belt 8 and the fiber structure 18 is decisive for the compression effect, which corresponds to their diameter in the case of circular compression holes. In the case of non-circular compression holes 17 4 , 17 5 of FIGS. 5 and 8, the dimension d 3 and d 5 accordingly designate their transverse extent.
• Appropriate diameters d 1 , d 2 for circular compression holes are between 0.5 mm and 1.2 mm and are preferably between 0.7 mm and 1.0 mm. With larger diameters of the compression holes, their mutual distance is usually also increased. However, this is largely due to the larger Diameter balanced, so that the space between the compression holes is only slightly different for the different diameters. Appropriate mutual distances a ,, a 2 of the compression holes are between 1.5 mm and 6 mm.
• Another way to reduce the compression effect is to increase only the transverse extent d 3 of the compression holes 17 4 , that is to say their expansion in the direction transverse to the running direction of the strappy 8 4 and the fiber structure according to FIG. 5, but also to slim them down to their cross-sectional area to reduce the air flow.
• Compression straps 8 5 according to FIG. 6 are known which, between approximately circular compression holes 17 1 with a small transverse extension d 1, have further oval or elongated round suction holes 19 with a larger transverse extension d 4 , by means of which fibers of the fiber structure that lie far from the perforation track enter the suction area of the Compression holes are sucked 17 times so that they can be included in the compression effect. If the compression effect is to be reduced in such slips, it is sufficient to enlarge the diameter of the compression holes 17 2 according to FIG. 7 (slips 8 6 ) or to increase the transverse extent of these compression holes 17 5 according to FIG. 8 (slips 8 7 ).
• the suction holes 19 have no effect on the extent of the compression and can be kept unchanged even with straps 8 S , 8 6 , 8 7 which are varied according to the invention.
• the suction holes 19 can also be adapted to changed compression holes 17 x with regard to their outline shape and transverse extent.
• FIG. 9 For the outline shape, in particular of the compression holes 17 x , a large number of embodiments are possible according to FIG. 9, the expedient selection of which depends on the parameters of the fiber structure to be compressed, for example its inlet width b into the compression device 7, the number of fibers in its Cross-section, the stiffness of the fibers, their crimp and the like.
• round compression hole in 9a is an elongated round, in 9b an oval, in 9c a triangular, in 9d a square, in 9e an oval with straight edges and in 9f a rectangular compression hole with a larger transverse extension and thus represented a reduced compression effect compared to the exit hole.
• further outline shapes can be expedient.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=29796118

Family Applications (1)

Country Status (5)

Families Citing this family (31)

Family Cites Families (8)

• 2002
  • 2002-07-03 DE DE2002129834 patent/DE10229834A1/de not_active Ceased
• 2003
  • 2003-06-30 WO PCT/DE2003/002163 patent/WO2004005598A1/de active Application Filing
  • 2003-06-30 JP JP2004518413A patent/JP2005531700A/ja active Pending
  • 2003-06-30 EP EP03762423A patent/EP1529128A1/de not_active Withdrawn
  • 2003-06-30 CN CN 03820884 patent/CN1681981A/zh active Pending

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events