Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
  • D04B21/20—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes specially adapted for knitting articles of particular configuration
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
  • D03D49/70—Devices for cutting weft threads
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D45/00—Looms with automatic weft replenishment
  • D03D45/50—Cutting, holding, manipulating, or disposing of, weft ends
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04B—KNITTING
  • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
  • D04B35/34—Devices for cutting knitted fabrics
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/929—Tool or tool with support

Definitions

• the invention relates to a cutting device for warp knitted fabrics according to the preamble of claim 1.
• a cutting device With such a cutting device, fancy yarns can be produced, which are also referred to as fantasy yarns.
• Cutting devices of the type mentioned are known.
• the cutting device is arranged directly on the knitting machine between the frontour and a tape take-off.
• the cutters are equipped with either scissors or a knife.
• the known cutting devices are complicated on the one hand and on the other hand cumbersome to handle and do not provide high quality fancy yarns.
• the object of the invention is to improve a cutting device of the type mentioned.
• the cutting device has guide members with projecting guide edges for supporting the weft threads of a warp-knitted fabric to be cut, the guide edges forming a gap between them for engaging a rotatable knife, on the one hand an exact guidance of the weft threads to be cut and a secure engagement of the rotating knife on the other hand guaranteed.
• the weft threads are optimally tensioned, in particular by the guide surfaces for the knitted chains, which spring back on the side of the guide edges and thus support a perfect cutting of the weft threads by the rotatable knife.
• the cutting device is simple, allows easy operation and delivers flawless fancy yarns.
• the cutting device can be integrated in a knitting machine, wherein the feed device and the removal device can be parts of the knitting machine. However, this is more advantageous if the cutting device is designed as an independent unit independently of a knitting machine.
• the cutting device can then be operated separately from the knitting machine, which has the advantage that, on the one hand, it is more easily accessible and, on the other hand, it enables optimum use, since the cutting device can cut much faster than the knitting machine.
• An independent cutting device has a much higher performance than a knitting machine.
• a separate cutting device also has the advantage that the knitting process of a knitting machine is not interrupted by any cutting errors that occur. Incidentally, in the case of a separate cutting device, there is no need to take structural restrictions into account which are caused by an arrangement in a knitting machine.
• the guide links of the cutting device can be designed as sliding bodies, past which the warp knitted fabric slides past.
• the embodiment according to claim 2 is more advantageous, according to which the guide links are designed as rotating bodies which support the movement of the warp knitted fabric along the knife.
• the areas of the guide members adjoining the guide edges are designed to prevent slippage, that is to say to have an anti-slip area in order to improve the entrainment of the guide members designed as rotating bodies.
• the anti-slip area can have a rubber covering.
• the embodiment according to claim 5 is particularly advantageous, according to which the anti-slip area is provided with a ring gear. If necessary, it may be appropriate to provide the rotatable guide members with a drive.
• the knife can rotate freely. However, it is more advantageous if it can be driven by a motor at a peripheral speed that is greater than the running speed of the warp knitted fabric. It can be expedient if the direction of rotation of the rotating knife is opposite to the running direction of the warp knitted fabric, a direction of rotation in the running direction of the warp knitted fabric is more advantageous.
• An embodiment of the cutting device according to claim 8 is particularly advantageous, according to which both the feed device and the discharge device have convex guide members, the recessed parts of which serve to receive the knitted chains.
• These guide members can be slide guides, but the embodiment according to claim 9 is more advantageous as rotatable guide members.
• the feed device is configured as a tensioning device.
• the removal device expediently has a removal roller.
• a particularly advantageous cutting device is obtained if, according to claim 12, a guiding comb which engages between the chains is arranged after the cutting device and can be moved back and forth in a controlled manner transversely to the running direction of the chains. This makes it possible to control the point of intersection along the weft threads, so that chains with frames of varying lengths can be produced as fancy yarns. The effect properties of the fancy yarns can be varied further.
• Figure 1 shows a cutting device for warp knitted fabrics in a schematic diagram
• Figure 2 shows the cutting area of the cutting device in vertical section transverse to
• Figures 1 and 2 show a cutting device for warp knitted fabrics 4 for the production of fancy yarns 2.
• the warp knitted fabric 4 has at least two warp knitted chains 6, between which floating weft threads 8 are arranged.
• the warp knitted fabric as shown, can consist of two warps 6 and weft threads 8 lying between them. As a rule, however, the warp knitted fabric 4 will have a greater width with numerous chains which are connected to one another by floating weft threads.
• the warp knitted fabric 4 is fed via a feed device 10, which is formed by a tension roller 12 and a deflection roller 14, which each have convex guide sections 16.
• the weft threads 8 lie over the projecting part 18 and the chains 6 in the recessed parts 20.
• the warp knitted fabric passes through a cutting device 22 in which the weft threads 8 are cut, the separated chains then being drawn off as a fancy yarn by a removal device 24 ,
• the fancy yarns 2 are then discharged from a downstream take-off roller 30.
• the cutting device 22 contains guide members 32, 34 with projecting guide edges 36, 38, which form a gap 40 between them, into which a rotating bares knife 42 engages.
• the knife 42 can be freely rotatable, but is preferably connected to a drive motor, not shown, which gives it a cutting speed preferably in the direction of the warp knitted fabric 4, which is greater than the running speed of the warp knitted fabric.
• the guide links 32, 34 are provided on the sides facing away from the guide edges 36, 38 with recessed guide surfaces 44, 46 for the chains 6.
• the guide links 32, 34 together form a cambered support surface for the warp knitted fabric to be cut.
• the chains 6 are pretensioned in the recessed part by the recessed guide surfaces 44, 46 and thereby tension the weft threads 8 connecting them over the gap 40 and thus provide optimal conditions for the perfect cutting by the rotating knife 42.
• the guide members 32, 34 can be slide guides, but they are advantageously designed as rotating guide members that are freely rotating. It is expedient if the areas adjoining the guide edges 36, 38 are designed as anti-slip areas 48, as a result of which the entrainment of the guide links is supported by the warp knitted fabric moving past.
• the anti-slip area has a toothed ring 50 for safe entrainment of the guide members 32, 34, the teeth 52 of which engage between the weft threads 8, whereby an optimal entrainment of the rotatable guide members 32, 34 is achieved.
• a guide comb 54 is arranged, which engages between the separate chains and can be moved back and forth in a controlled manner transversely to the running direction of the chains. This makes it possible to laterally offset the warp knitted fabric to be cut on the guide links to a certain extent, as a result of which the point of intersection of the knife on the weft threads 8 can be offset. This makes it possible to produce fancy yarns with fringes 56 of varying lengths. LIST OF REFERENCE NUMBERS

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Knitting Machines (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32831658

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (13)

• 2004
  • 2004-01-30 KR KR1020057014193A patent/KR100671340B1/ko not_active Expired - Fee Related
  • 2004-01-30 JP JP2006501442A patent/JP2006518425A/ja not_active Withdrawn
  • 2004-01-30 CN CNA2004800029023A patent/CN1742126A/zh active Pending
  • 2004-01-30 EP EP04706594A patent/EP1590518A2/de not_active Withdrawn
  • 2004-01-30 WO PCT/CH2004/000049 patent/WO2004070098A2/de not_active Ceased
  • 2004-01-30 US US10/544,052 patent/US20060053997A1/en not_active Abandoned
  • 2004-01-30 BR BRPI0407208 patent/BRPI0407208A/pt not_active IP Right Cessation

Non-Patent Citations (1)

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