EP2447404B1 - Couteau de tuftage à zone de pliage - Google Patents

Couteau de tuftage à zone de pliage Download PDF

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Publication number
EP2447404B1
EP2447404B1 EP10189110.9A EP10189110A EP2447404B1 EP 2447404 B1 EP2447404 B1 EP 2447404B1 EP 10189110 A EP10189110 A EP 10189110A EP 2447404 B1 EP2447404 B1 EP 2447404B1
Authority
EP
European Patent Office
Prior art keywords
tufting
knife
recess
tufting knife
knife according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10189110.9A
Other languages
German (de)
English (en)
Other versions
EP2447404A1 (fr
Inventor
Bernd Hillenbrand
Roland Vogler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Groz Beckert KG
Original Assignee
Groz Beckert KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Groz Beckert KG filed Critical Groz Beckert KG
Priority to EP10189110.9A priority Critical patent/EP2447404B1/fr
Priority to JP2011216502A priority patent/JP5938157B2/ja
Priority to KR1020110101588A priority patent/KR101944234B1/ko
Priority to US13/275,850 priority patent/US8430042B2/en
Priority to CN201110329091.XA priority patent/CN102454072B/zh
Publication of EP2447404A1 publication Critical patent/EP2447404A1/fr
Application granted granted Critical
Publication of EP2447404B1 publication Critical patent/EP2447404B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D05C15/24—Loop cutters; Driving mechanisms therefor
    • 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

Definitions

  • the invention relates to a tufting knife for a tufting machine for the production of Schneidflor.
  • Tufting machines for the production of cutting pile are basically known and have been in use for a long time.
  • the DE 27 45 793 C a tufting machine, to its always the same basic components a Rietblatt with Rietfingern for supporting the planar support material, a bar with tufting needles, which punctures the substrate rhythmically and thereby pulls thread loops in the substrate, a gripper bar with grippers for receiving the generated loops and a knife bar with knives for slicing the loops belong.
  • the knife contact pressure between the knife and the gripper causes wear on the grippers and also on the knives, which limits the service life of the knife and / or gripper. This is especially true when the gripper has a carbide insert, the respect Messers has increased abrasive action.
  • Tufting gripper and tufting knife are known with soldered carbide cutting body.
  • the disclosed DE 28 56 344 the attachment of tufting knives in a knife block to a bar.
  • the knife block is tuned to the thickness of the knife. If knives of higher flexibility and consequently smaller thickness are to be used, the knife block must be changed. This represents a considerable effort.
  • Out GB 1 087 196 A shows a tufting knife for a tufting machine, which has an elongated strip-shaped base body, at one end of a cutting edge is formed. This body is made of elastic spring steel.
  • a tufting knife for a sewing machine with a flat body is in GB 487 478 described.
  • the tufting knife according to the invention has a strip-shaped main body, at one end of which a cutting edge is formed. At some distance from the cutting edge, a bending joint is formed, which defines a transverse to the main body bending axis.
  • the bending joint divides the main body into two legs, which are elastically connected to each other via the bending joint. One of the legs carries the cutting edge, while the other leg can be anchored to a knife block.
  • the bending joint allows the bending point and thus the position and angular orientation of the leg carrying the cutting edge to be adjusted in a controlled manner.
  • the contact force between the tufting knife and the gripper can be adjusted as desired, regardless of the thickness of the tufting knife. This gives good control over the position of the knife and the forces acting on it and on the hook. In particular, excessive blade wear and / or excessive gripper wear can be avoided.
  • the bending joint or the bending hinge is a spring hinge, which not only ensures the mobility of the two legs of the tufting knife against each other, but also acts as a leaf spring.
  • the spring hinge is formed integrally with the rest of the base body, i. It consists of the same material as this one and connects seamlessly and seamlessly to it. In principle, however, it is also possible to form the spring hinges as a separate element which is connected to the two legs of the tufting knife, e.g. is connected by laser welding seams or other joining methods.
  • the resilient portion which forms the spring hinge have a smaller material thickness than the rest of the base body. It may be formed by a trough-shaped recess which extends from one longitudinal edge of the tufting knife to its other longitudinal edge.
  • the two Long edges may be straight edges or may follow curved, stepped or other contours.
  • the trough-shaped recess or depression can be formed on only one of the flat sides of the tufting knife. It is also possible to attach a trough-shaped depression on both sides.
  • the recess extends over the entire width of the flat side, again preferably with a constant cross section.
  • the recess may have different cross-sectional shapes. Preference is given to the formation of the recess with a rounded bottom, so that the trough expires flat at both edges. For example, From the edge of the trough, the material thickness in the longitudinal direction of the tufting blade is reduced to the center of the trough to rise from there to the next edge again. In the center of the trough, the material thickness of the bending hinge is preferably 30% to 70%, more preferably 40% to 60%, and in the concrete present embodiment 50% of the material thickness of the rest of the body. There are also trough shapes with other contours, e.g. Trapezoid contour possible.
  • the recess has a width to be measured in the tufting knife longitudinal direction, which width is greater than the strip width of the main body to be measured transversely thereto. Further preferably, the recess follows a radius of curvature, which is about twice as large as twice the width of the base body. The width of the base body is measured at the location of the recess from the longitudinal edge to the longitudinal edge of the base body. In addition, the distance of the center of the recess from the cutting edge is preferably less than half of the radius of curvature and greater than one third of the same.
  • a 0.8 mm thick tufting knife according to the invention can provide the same contact pressure as a standard tufting knife with a thickness of 0.6 mm.
  • the tufting knife according to the invention enables a very simple adjustment of the tufting machine.
  • the contact pressure of a tufting knife on the gripper can be adjusted for example by laterally adjusting the knife bar to the gripper bar in the tufting machine.
  • the adjustment must be made so that the tufting knife on the one hand should not run too hard on the opposite gripper, on the other hand, a secure cutting function must be guaranteed.
  • this setting must be very sensitive, so that the contact pressure is neither too great nor too small. It is difficult to ensure the correct setting for all knives at the same time and to guarantee compliance with the tolerances over longer operating periods.
  • the provided with the bending joint Tuftingmesser invention are far more tolerant here.
  • Another advantage of the invention is particularly evident in tufting knives with cutting insert.
  • the measure encounters limits on tufting knives with cutting inserts, e.g. made of tungsten carbide or ceramic.
  • Such tufting knives consist of a carrier with a pocket or a recess for receiving the cutting insert. If the carrier is too thin, it will be weakened too much at the receiving of the cutting insert, which can lead to premature failure.
  • the bending joint of the tufting knife according to the invention makes it possible in particular to make thicker tufting knives flexible with a cutting insert, so that the knife pressure can be reduced to the value of the next thinner knife.
  • the type of knife holder can remain the same.
  • FIG. 1 a tufting apparatus 10 is illustrated which is used to make tufted material such as carpet.
  • This consists of a carrier material 11 through which 12 loops 13, 14, 15 and 16 are stung by means of tufting needles, which are to form the pile 11 to be produced on the carrier material. While the carrier material rests on a Rietblatt with Rietfingern 17, the loops 13, 14, 15 and 16 are received by a gripper 18. This sits with other congruent and identical grippers in modules or directly to a gripper bar 19, which synchronously in the power stroke to the tufting needles 12 for receiving the newly formed during insertion into the carrier material 11 loop (13, 14, 15, 16) to be moved.
  • the tufting needles 12 are held in large numbers on a corresponding not further illustrated needle bar.
  • FIG. 1 shows two such cut slings 22, 23rd
  • FIG. 2 illustrates the tufting device 10 in front view, wherein the representation of the gripper 18, the tufting knife 20 and the knife bar 21 is reduced. Because the grippers 18 are identical to each other, reference is made to each gripper 18 individually as well as to the grippers 18 in their entirety by the same reference numerals. The same applies to the knives 20.
  • each knife 20 has a base body 24, to which a holding leg 25, a cutting leg 26 and an interposed bending joint 27 are included.
  • the bending joint 27 merges seamlessly into the adjoining legs 25, 26 and consists of the same material as these. It is generally formed in all embodiments described below by a zone of reduced material thickness. Regardless of the bending joint 27 may also be formed as a separate element, for example a spring plate section, which is connected to the adjoining legs 25, 26, for example by welding points or welds.
  • the tufting knife 20 is in FIG. 3 separately illustrated.
  • Its strip-shaped main body 24 has two in the present embodiment straight longitudinal edges 28, 29 which extend from a holding block-side end 30 to a cutting edge-side end 31.
  • the longitudinal edges 28 may be straight as shown or may have different shapes, including, for example, corners, steps, waves or other contours.
  • the base body 24 preferably consists of a strip-shaped sheet metal section, of a suitable metal or similar resilient material. Between its flat sides 32, 33 (see FIG. 4 ), a thickness 34 is to be measured, which is substantially smaller than the width 35 to be measured between the longitudinal edges 28, 29.
  • the tufting knife 20 is provided with a cutting edge 36, which may be straight, wavy, serrated or formed as shown one or more angled.
  • the cutting edge 36 is preferably arranged on the in use the gripper 18 facing side of the tufting knife 20. It can be produced by providing the base body 24 with an obliquely arranged end face at its front end 31, which extends for example, with the flat side 32 meets the cutting edge 36.
  • the bending joint 27 is preferably formed by a depression or trough-shaped recess 37, which extends transversely to the longitudinal direction of the tufting knife 20 via one of its flat sides 32, 33.
  • the longitudinal direction of the tufting knife 20 is determined by the longitudinal edges 28, 29.
  • the recess 37 may extend as shown at right angles to the longitudinal direction.
  • the edges 38, 39 of the recess 37 are recognizable at right angles to the longitudinal edges 28, 29 oriented. They can also be oriented at an acute angle to the longitudinal direction, as in FIG. 3 indicated by dashed lines.
  • the bending joint defines a hinge axis 40 that is transverse to the longitudinal direction of the tufting knife 20. As shown, it can stand at right angles or at an acute angle to the longitudinal direction of the tufting knife. The latter is the case when the edges 38, 39, as shown by dashed lines, are not oriented at right angles to the longitudinal direction.
  • the recess 37 preferably follows an arcuate curvature, as in particular from FIG. 4 is apparent.
  • the radius R, with which the bottom of the recess 37 is curved, is preferably two to three times as large as the width 35 of the tufting blade 20.
  • the distance of the center of the recess 37 from the cutting edge 36 is preferably less than half of the rounding radius R, and greater than a third of it.
  • the center of the recess 37 is located centrally between the edges 38, 39 and approximately corresponds to the position of the hinge axis 40.
  • the edges 38, 39 are those Lines in which the curved bottom of the recess 37 meets the flat side 33. As a reference point for distance measurement to the cutting edge whose center is 41 (see FIG. 3 ).
  • the tufting device 10 described so far operates as follows:
  • the gripper bar 19 and the knife bar 21 are moved relative to one another such that the tufting knife 20 perform a cutting movement towards the lower edge of the gripper 18.
  • the tufting knife 20 put with their flat sides 32 to the gripper 18 and slide along it. They are flexibly deformed and clamped against the side surface of the respective gripper 18, wherein the bending joints 27, as shown FIG. 2 can be seen, yield elastically and thereby resiliently generate the desired contact force between the tufting knife and the gripper 18.
  • the legs 25, 26 deform less or not. The deformation is substantially concentrated on the bending joint 27. In FIG. 5 this is exaggerated again.
  • the thickness 34 is reduced at the thinnest point to a minimum thickness 42 which is to be found in the middle of the recess 37. This location of the minimum thickness 42 determines the position of the hinge axis 40.
  • the flexure 27 provides a desired high compliance of the tufting blade 20.
  • the leg 26 can flexibly avoid the grippers 18 without thereby generating excessive contact forces.
  • the spring characteristic of the tufting knife is much softer than that of a tufting knife of the same thickness without a bending joint 27.
  • the tufting device 10 is thus much more robust, less sensitive to incorrect settings of the cutting gap and more durable. In particular, the abrasive wear between the tufting blades 20 and the grippers 18 is reduced.
  • the bending joint 27 is preferably arranged on the flat side 33 of the tufting knife 20 remote from the cutting edge 36 (see FIG FIG. 4 ). However, it can also be arranged on the opposite side, such as FIG. 6 suggests.
  • the recesses can be generated by material removal or material displacement.
  • the recesses on both flat sides 32, 33 may have the same or different shapes and / or positions.
  • the edges 38, 39 may be formed as shown straight or curved. For example, the edges 38, 39 at the longitudinal edges 28, 29 have a greater distance from each other, as in a central region.
  • the cutting edge 36 may be formed on a hard material insert 43, for example made of ceramic, hard metal or the like. This can be soldered to the base body 24 of the tufting knife 20 or otherwise connected.
  • the leg 26 may have a corresponding receptacle, for example in the form of a pocket, in or on which the cutting insert 43 is arranged. Otherwise, the previous description applies accordingly in addition.
  • An improved tufting knife 20 has a bending joint 27 at a distance from its cutting edge 36, from which one leg 26 extends to the cutting edge 36 and another leg 25 to a knife bar 21.
  • the Bend joint 27 ensures a high degree of flexibility of the tufting blade 20 and the maintenance of a desired contact force between the tufting knife 20 and gripper 18 largely independent of the size of the lateral flexion or deflection of the tufting blade 20. This has a strong wear-reducing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Knives (AREA)

Claims (12)

  1. Couteau de tuftage (20) pour machine à tufter, comprenant un corps de base (24) allongé en forme de bande et comprenant une arête de coupe (36) formée à une extrémité (31) du corps de base (24), caractérisé en ce qu'une articulation de flexion (27) est formée à distance de l'arête de coupe (36).
  2. Couteau de tuftage selon la revendication 1, caractérisé en ce que l'articulation de flexion (27) est une charnière élastique.
  3. Couteau de tuftage selon la revendication 2, caractérisé en ce que la charnière élastique est réalisée sous la forme d'une partie du corps de base (24) formée de manière à faire ressort.
  4. Couteau de tuftage selon la revendication 3, caractérisé en ce que la partie faisant ressort présente une épaisseur de matière (42) plus faible que le reste du corps de base (24).
  5. Couteau de tuftage selon la revendication 1, caractérisé en ce que le corps de base (24) présente deux côtés plats (32, 33) qui sont limités par des arêtes longitudinales (29, 28), et en ce que l'arête de coupe (36) relie les deux arêtes longitudinales (29, 28) entre elles.
  6. Couteau de tuftage selon la revendication 5, caractérisé en ce que l'articulation de flexion (27) est formée par un évidement (37) en forme d'auge dans au moins un des côtés plats (32, 33) du corps de base (24).
  7. Couteau de tuftage selon la revendication 6, caractérisé en ce que l'évidement (37) en forme d'auge s'étend sur toute la largeur (35) du côté plat (32, 33).
  8. Couteau de tuftage selon la revendication 7, caractérisé en ce que l'évidement (37) présente une section constante suivant sa longueur.
  9. Couteau de tuftage selon la revendication 6, caractérisé en ce que l'évidement (37) présente un fond arrondi.
  10. Couteau de tuftage selon la revendication 6, caractérisé en ce que l'épaisseur minimale (42) du corps de base (24) au niveau de l'évidement (37) correspond sensiblement à la moitié de l'épaisseur (34) du couteau de tuftage (20).
  11. Couteau de tuftage selon la revendication 6, caractérisé en ce que l'évidement (37) suit un rayon d'arrondi (R) qui est environ deux fois supérieur au double de la largeur (35) du couteau de tuftage (20).
  12. Couteau de tuftage selon la revendication 11, caractérisé en ce que la distance du milieu de l'évidement (37) à l'arête de coupe (36) est inférieure à la moitié du rayon d'arrondi (R) et supérieure à un tiers du rayon d'arrondi (R).
EP10189110.9A 2010-10-27 2010-10-27 Couteau de tuftage à zone de pliage Not-in-force EP2447404B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10189110.9A EP2447404B1 (fr) 2010-10-27 2010-10-27 Couteau de tuftage à zone de pliage
JP2011216502A JP5938157B2 (ja) 2010-10-27 2011-09-30 わずかな屈曲点を有するタフティング・ナイフ
KR1020110101588A KR101944234B1 (ko) 2010-10-27 2011-10-06 공칭 절곡점을 구비한 터프팅 나이프
US13/275,850 US8430042B2 (en) 2010-10-27 2011-10-18 Tufting knife with a nominal bending point
CN201110329091.XA CN102454072B (zh) 2010-10-27 2011-10-26 具有名义弯曲点的簇绒刀

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10189110.9A EP2447404B1 (fr) 2010-10-27 2010-10-27 Couteau de tuftage à zone de pliage

Publications (2)

Publication Number Publication Date
EP2447404A1 EP2447404A1 (fr) 2012-05-02
EP2447404B1 true EP2447404B1 (fr) 2014-02-19

Family

ID=43911599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10189110.9A Not-in-force EP2447404B1 (fr) 2010-10-27 2010-10-27 Couteau de tuftage à zone de pliage

Country Status (5)

Country Link
US (1) US8430042B2 (fr)
EP (1) EP2447404B1 (fr)
JP (1) JP5938157B2 (fr)
KR (1) KR101944234B1 (fr)
CN (1) CN102454072B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014102801B4 (de) * 2014-03-03 2015-11-05 Groz-Beckert Kg Profilierter Schlingengreifer
CN109594274B (zh) * 2018-12-18 2021-03-16 江苏工程职业技术学院 一种可调面积的行星式圆形织物剪绒机构

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB487478A (en) * 1937-11-10 1938-06-21 Oscar Ray Strain Tufting attachment for sewing machines
US3357290A (en) 1964-02-11 1967-12-12 Dock Grinding And Engineering Attaching of cutting tips to shanks or bodies of cutting blades and loopers for carpet making
GB1087196A (en) * 1964-02-11 1967-10-11 Dock Grinding & Engineering Co Improvements in or relating to the attaching of cutting tips to shanks or bodies of cutting blades and loopers for carpet making
US3595184A (en) * 1970-06-23 1971-07-27 Singer Co Tufting mechanism for producing shag fabrics
US3735715A (en) * 1972-01-24 1973-05-29 W Passons Apparatus for tufting uniform cut pile
GB1369887A (en) * 1972-04-13 1974-10-09 Pickering Edgar Ltd Tufting machines
US3880101A (en) * 1974-04-22 1975-04-29 William Erby Passons Looper apparatus for tufting uniform cut pile
US3913505A (en) * 1974-12-04 1975-10-21 Singer Co Staggered needle cut-pile tufting machine
US4067270A (en) 1976-08-04 1978-01-10 Tuftco Corporation Narrow gauge cut pile tufting apparatus
US4207825A (en) 1978-01-09 1980-06-17 Edgar Pickering (Blackburn) Limited Knife assembly for tufting machines
US4193359A (en) * 1978-06-23 1980-03-18 Tuftco Corporation Low pile forming apparatus for tufting machine
US4207826A (en) 1978-10-12 1980-06-17 The Singer Company Throat plate with thread separator rib
US4602576A (en) * 1985-11-08 1986-07-29 Cox Ronnie L Tufting machine hook
US4694761A (en) * 1986-01-06 1987-09-22 Yackob Golda Yarn cutting head
JPH0559656A (ja) * 1991-08-31 1993-03-09 Hanii Steel Kk タフテツド機およびナイフ
GB9924840D0 (en) * 1999-10-20 1999-12-22 Cobble Blackburn Ltd Cut pile tufting machine cutting elements

Also Published As

Publication number Publication date
EP2447404A1 (fr) 2012-05-02
KR20120047764A (ko) 2012-05-14
KR101944234B1 (ko) 2019-01-31
JP2012092486A (ja) 2012-05-17
US8430042B2 (en) 2013-04-30
CN102454072B (zh) 2015-07-01
CN102454072A (zh) 2012-05-16
US20120103239A1 (en) 2012-05-03
JP5938157B2 (ja) 2016-06-22

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