Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05C—EMBROIDERING; TUFTING
  • D05C15/00—Making pile fabrics or articles having similar surface features by inserting loops into a base material
  • D05C15/04—Tufting
  • D05C15/08—Tufting machines
  • D05C15/16—Arrangements or devices for manipulating threads
  • D05C15/20—Arrangements or devices, e.g. needles, for inserting loops; Driving mechanisms therefor
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B85/00—Needles

Definitions

• the invention relates to an improved tufting needle
• Tufting needles are known for example from EP 0 874 932 B1.
• the tufting needle illustrated in this publication has a base body, the holding end of which is held in a holding body. The other end runs into a tip that is adjacent to an eye.
• a thread groove extends along the shaft to the eye.
• a tufting needle is known from US Pat. No. 5,189,966, which has curved bevels on its flanks for a loop gripper. However, it does not have a real groove.
• the shaft has a cross section in the region of the bevels in the manner of an arc triangle.
• a tufting needle is known from WO 90/06391, which is provided with a fillet near the eye.
• the fillet serves to provide a loop gripper or other tools with better access to the thread.
• the tufting needle is flattened and mechanically weakened.
• Loop grippers can hit the tufting needle in the area of the groove and reach into the groove across the needle. Over time, the tufting needle will wear as a result of material removal. If this has progressed too far or if a breakthrough to the thread groove is created, the tufting needle must be replaced. This limits the service life.
• the tufting needle according to the invention has a chamfer provided with at least one chamfer, the chamfer standing more steeply on its edge facing the needle flank than further inside.
• the gripper strikes the chamfer in an outer region which is at the angle ⁇ , ⁇ lies for example in the range from 35 ° to 50 ° and is preferably 45 °.
• the needle body can be arranged in the tufting module with an angle of attack. This means that the reference plane of the tufting needle is not oriented at right angles to a contact surface of a needle bar. Such a position, which normally increases the friction between the gripper and the needle, is well tolerated by the needle according to the invention.
• the needle body is preferably flattened. This applies particularly to the area of the fillet.
• the section adjoining the fillet can also be flattened. This results in a good needle elasticity in a needle side direction and a high needle stiffness in a side direction perpendicular thereto, which generally corresponds to the material transport direction of the base material.
• the tufting needle can have a thread groove. If this is not necessary, it can also be omitted if necessary.
• the fillet is preferably symmetrical with respect to a central plane. This means that it can be used in both right and left orientation.
• the fillet can be provided with chamfers on both sides to enable the latter.
• the fillet is in turn preferably oriented symmetrically to the central plane. The way of working in the right orientation and in the left orientation is then the same.
• the cross section of the needle then has a roof-like shape that is rounded or faceted in the area of the fillet. Despite chamfering on both sides of the fillet, there are large wall thicknesses towards the thread groove.
• Shaft width can be reached. This comes e.g. the stability of the tufting needle.
• the symmetrical arrangement of the chamfers can also lead to improved wear behavior of the needle for another reason. It is largely prevented that the gripper scrapes against the edge of the fillet when the thread is laid out on one side during the return stroke of the needle. The risk of sharp edges forming, which could lead to injuries to the carrier material, is reduced. Further details of advantageous refinements and developments of the invention result from the drawing, the description or from claims.
• FIG. 1 shows a perspective view of a section of a bar and a tufting needle module held thereon with a plurality of tufting needles oriented parallel to one another
• FIG. 2 shows the module according to FIG. 1 in front view
• FIG. 3 shows the module according to FIG. 1 in a side view
• FIG. 4 shows a cross section through a tufting needle in the region of its groove
• FIG. 5 shows one of the tufting needles of the modules according to FIGS. 2 and 3 in front view
• Figure 6 shows the tufting needle of Figure 5 in a longitudinal section.
• a bar 1 with a tufting module 2 held thereon is illustrated schematically in FIG.
• the tufting module 2 consists of a body 3 in or on which a group of tufting needles 4 is held.
• the body 3 rests with a 5 flat side on the front side 5 of the bar 1.
• the tufting needles 4 are aligned parallel downward at a distance.
• FIGS. 4, 5 and 6 illustrate the tufting module 2 10 separately.
• the tufting needles 4 are of identical design and flattened with one another. With their upper end they are held in the body 3. As can be seen from FIG. 3, their eyes 6 are aligned, for example, with one another.
• FIGS. 4, 5 and 6 The structure of a single tufting needle 4 is shown in FIGS. 4, 5 and 6.
• the tufting needle 4 has a needle body 7 which forms a shaft 9 which extends up to a tip 8.
• the tip 8 20 marks the center of the shaft 9.
• a flattened section 13 extends in the direction of the tip 8.
• a section 14 adjoins the flattened section 13 and is provided with a fillet 15 30.
• the section 13 is upwards through a Face 16 completed.
• the fillet 15 approaches the longitudinal axis 11 closer to the flat surface 16. It forms a long, saddle-shaped indentation.
• the eye 6 is provided in the immediate vicinity of the groove 15. It is surrounded by a flat ring surface 17, which is preferably arranged in one plane with the flat surface 16.
• a section 18 begins in which the needle body 7 tapers towards the tip 8. As can be seen in particular from FIG.
• FIG. 4 illustrates the cross section of the tufting needle 4, cut along the line IV-IV shown in FIG. 5. Different representation scales are selected in FIGS. 4 and 5.
• the thread trough 19 is preferably approximately trapezoidal.
• Legs 21, 22 adjoin the thread groove 19 on both sides and are delimited on the thread groove side by flat surfaces 23, 24.
• the flat surfaces 23, 24 form an obtuse angle with one another. They end in edges 25, 26 which are radially clearly outside an outline 27 which the shaft 9 has in the section 12. The legs 21, 22 thus protrude beyond this outline 27.
• the eye cut away and thus not illustrated has a vertical opening direction.
• This is perpendicular to a reference plane 28.
• This is preferably aligned parallel to the flat surface 16.
• the reference plane 28 extends longitudinally through the tufting needle 4 and thus contains the longitudinal axis 11.
• a central plane 29 is to be thought that intersects the reference plane 28, the cutting line being the
• the central plane 29 forms a plane of symmetry for the tufting needle 4.
• a rounding 31 is provided which merges into surfaces that are straight with respect to the longitudinal direction. These surfaces include a plane surface 32 arranged symmetrically to the central plane 29, which is preferably oriented parallel to the reference plane 28. There are chamfers on both sides of the plane surface 32
• the chamfers 33, 34 are arranged that intersect the reference plane 28.
• the chamfers 33, 34 are arranged symmetrically to the central plane 29.
• the bevels 33, 34 are faceted. Accordingly, they each contain two strip-shaped flat surfaces 35, 36 or 37, 38, which merge into a rounded or curved surface 41, 42.
• the surface 41 lies between the flat surfaces 35, 36.
• the surface 42 lies between the flat surfaces 37, 38.
• the chamfers 33, 34 connect to the flat surface 32 via rounded or curved surfaces 43, 44.
• the plane surfaces 35, 36 and 37, 38 form an obtuse angle with each other in pairs. As a result, they lie at different angles to the reference plane 28 or a parallel thereto, as is illustrated in FIG. 4.
• the plane surface 38 includes a pointed ⁇ with a line 45 parallel to the reference surface 28.
• the flat surface 36 includes an acute angle ⁇ with the line 45.
• the angle is smaller than the angle ⁇ .
• the angle ⁇ is preferably in the range from 20 ° to 40 °. In the present preferred embodiment it is 30 °.
• the angle ⁇ is preferably in the range from 35 ° to 55 °. In the present preferred exemplary embodiment, it is 45 °.
• the flat surfaces 35, 37 lie at the edges, ie they preferably end in an edge 46, 47 which lies outside the outline 27.
• the outer flanks 48, 49 of section 14 lie outside the outline 27.
• the flanks 48, 49 are preferably slightly curved.
• the tufting needle 4 described so far works as follows:
• a thread is passed through the thread groove and the eye 6. If the tufting needle 4 now pierces through a base material, the thread is drawn from the eye 6 through the base material, a looper is moved towards the tufting needle 4 in the vicinity of the lower reversal point of the needle 4.
• the looper is designed like a hook. It first meets the flat surface 37 with its tip. Because of its strong inclination to the reference plane 28 (acute angle ⁇ ), a large distance between the edge 47 and the line 45 is achieved. Regardless of existing misalignments, tolerances, inaccuracies or bends, the tip of the looper thus securely hits the chamfer 34. It then glides along the flat surface 37 and then reaches the flat surface 38.
• the curvature present in the chamfers 33, 34 leads at 41 and 42, respectively, to an increase in the wall thickness a, b towards the thread groove 19. Ultimately, this not only benefits the rigidity of the tufting needle 4 but also its wear resistance. Gradual removal of the existing wall only leads to unacceptable wear after very long use.
• a novel tufting needle 4 is characterized by a preferably a center plane 29 formed symmetrically groove 15, which is provided on both sides with chamfers 33, 34.
• the bevels 33 In an area lying on the inside, ie close to the central plane 29, the bevels 33 have only a small acute angle to a reference plane 28, while in an area lying outside on the edge (edges 46, 47) in one area larger acute angle ß are inclined to the reference plane 28. This improves the rigidity, the tufting properties and the mechanical stability and wear resistance of the new tufting needle 4.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Textile Engineering (AREA)
• Knitting Machines (AREA)
• Treatment Of Fiber Materials (AREA)
• Finger-Pressure Massage (AREA)
• Portable Nailing Machines And Staplers (AREA)
• Nonwoven Fabrics (AREA)
• Tires In General (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=32336919

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (15)

• 2004
  • 2004-03-20 DE DE202004004401U patent/DE202004004401U1/de not_active Expired - Lifetime
• 2005
  • 2005-02-17 KR KR1020067019152A patent/KR100790674B1/ko active IP Right Grant
  • 2005-02-17 AT AT05715360T patent/ATE397688T1/de not_active IP Right Cessation
  • 2005-02-17 US US10/593,450 patent/US7328664B2/en active Active
  • 2005-02-17 CN CN2005800090223A patent/CN1946893B/zh active Active
  • 2005-02-17 EP EP05715360A patent/EP1727931B1/fr active Active
  • 2005-02-17 WO PCT/EP2005/001585 patent/WO2005095703A1/fr active IP Right Grant
  • 2005-02-17 DE DE502005004344T patent/DE502005004344D1/de active Active
  • 2005-02-17 JP JP2007503213A patent/JP4436411B2/ja not_active Expired - Fee Related

Non-Patent Citations (1)

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