EP1767683B1 - Looper for tufting machine - Google Patents
Looper for tufting machine Download PDFInfo
- Publication number
- EP1767683B1 EP1767683B1 EP05020695A EP05020695A EP1767683B1 EP 1767683 B1 EP1767683 B1 EP 1767683B1 EP 05020695 A EP05020695 A EP 05020695A EP 05020695 A EP05020695 A EP 05020695A EP 1767683 B1 EP1767683 B1 EP 1767683B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- looper
- corrugations
- throat portion
- piles
- hook throat
- 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
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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
- D05C15/22—Loop-catching arrangements, e.g. loopers; Driving mechanisms therefor
Definitions
- the present invention relates to a looper for use in a tufting machine for manufacturing carpets.
- Fig. 6 shows a conventional looper 1 which includes a hook throat portion 2 having a bottom edge 3.
- Loops B are formed on a backing cloth A by moving the looper 1 back and forth as shown by the arrow while feeding the backing cloth A in the direction of the arrow. Since the bottom edge 3 is a straight and smooth ground surface, when the backing cloth A and the looper 1 move, the tips of the loops B slide along the bottom edge 3 toward the opposite end to the tip of the hook throat portion 2 as shown.
- the loops B When the loops B are cut by the knife C, the loops B tend to be pushed by the knife C toward the front corner of the hook throat portion 2 because the knife C has a shear angle D. Some of such loops may not be cut at all or partly cut.
- a looper for use in a tufting machine comprising a hook throat portion having a bottom edge formed with a corrugation is known from DE 37 09 977A1 .
- This known looper has a single corrugation located at the outward end of the bottom edge where the latter merges into the hook.
- This single corrugation has the purpose of avoiding a sharp edge directly behind the hook.
- An object of the present invention is to provide a looper which can form cut piles having uniform lengths, and which allows the knife to reliably, precisely and cleanly cut all the required loops by the cutting edge which has various corrugated shapes and/or a rough surface.
- a looper for use in a tufting machine comprising a hook throat portion having a bottom edge formed with corrugations or a rough surface along the entire length thereof or partly along the length thereof.
- the corrugations may have uniform pitches and heights, or may have uneven pitches and/or uneven heights.
- the corrugations have pitches in the range of about 0.01 to 6 mm and heights in the range of about 0.01 to 2 mm.
- the corrugations formed along the bottom edge of the hook throat portion will provide suitable resistance to loop piles hooked by the hook throat portion, thereby preventing the loop piles from being held in an unexpected position of the hook throat portion.
- This makes it possible to form loop piles having uniform lengths.
- the corrugations will prevent the loop piles from sliding away from the knife, so that the loop piles can be reliably and precisely cut at constant positions.
- it is possible to smoothly cut yarns which have been difficult to cut, such as single yarns having a large denier, monofilaments, filaments, tape yarns and natural fibers like cotton.
- the looper 10 comprises a base portion 11 supported on a looper block, which is described later, a neck portion 12 extending substantially vertically upwardly from the base portion 11, and a hook throat portion 13 extending substantially horizontally from the neck portion 12 and having a bottom edge 14 which is formed with corrugations along the entire length thereof or partly along the length thereof.
- the corrugations are typically formed with equal pitches p and heights h. But the corrugations may be formed such that their pitches and/or heights decrease gradually toward the tip of the hook throat portion 13.
- the corrugations have heights h in the range of about 0.01 to 2 mm, more preferably in the range of about 0.1 to 2 mm, and pitches p in the range of about 0.01 to 6 mm, more preferably in the range of about 0.1 to 6 mm.
- the looper 10 is mounted on a looper block H of a tufting machine (in the case of a "mold" type, the looper is directly mounted on a looper bar LB).
- Loop piles B are formed on a backing cloth A which is being fed in the direction of the arrow in Fig. 2 by moving the looper block H back and forth, and vertically moving the knife C and the needle N, in synchronization with each other.
- the knife C is raised to cut the piles B to form cut piles.
- the corrugations formed along the edge 14 provide suitable resistance to the respective piles B, thus preventing the piles B from sliding along the edge 14 away from the knife C even though the knife C has a shear angle D.
- the piles B can be cut reliably and precisely and smoothly at constant positions, so that cut piles of uniform lengths are formed.
- the crests and troughs forming the corrugations may extend substantially parallel to the width direction of the hook throat portion 13 of the looper (i.e. the direction perpendicular to the side surface of the looper to be brought into sliding contact with the knife C) as shown in Fig. 4A and 4A', or may extend obliquely toward or away from the tip of the hook throat portion 13 with respect to the width direction of the hook throat portion 13 as shown in Figs. 4B, 4B' and 4C, 4C'.
- By adjusting the inclination angle of the crests and troughs forming the corrugations with respect to the width direction of the hook throat portion it is possible to adjust the movement of the pile yarns.
- the crests and troughs forming the corrugations may extend substantially horizontally (i.e. perpendicular to the height direction of the hook throat portion 13 of the looper) as shown in Fig. 4D, or may extend obliquely upwardly or downwardly from the side surface of the hook throat portion 13 as shown in Figs. 4E and 4F.
- the looper 10 according to the present invention is not limited to the looper shown in Fig. 1.
- the looper 10 according to the present invention may include a vertically downwardly extending base portion 11 as shown in Fig. 5A, may include a spring 16 extending along a groove 18 formed in the base portion 11 as shown in Fig. 5B, or may include a clip 17 connected to the neck portion 12 to sandwich loop piles between the clip 17 and the hook throat portion 13 as shown in Fig. 5C.
- the looper 10 according to the present invention may be of a molded modular type which comprises 5 to 20 loopers that are formed into a one-piece body by molding.
- the bottom edge may be formed with a rough surface.
Abstract
Description
- The present invention relates to a looper for use in a tufting machine for manufacturing carpets.
- Fig. 6 shows a
conventional looper 1 which includes ahook throat portion 2 having abottom edge 3. Loops B are formed on a backing cloth A by moving thelooper 1 back and forth as shown by the arrow while feeding the backing cloth A in the direction of the arrow. Since thebottom edge 3 is a straight and smooth ground surface, when the backing cloth A and thelooper 1 move, the tips of the loops B slide along thebottom edge 3 toward the opposite end to the tip of thehook throat portion 2 as shown. When the loops B are cut by the knife C, the loops B tend to be pushed by the knife C toward the front corner of thehook throat portion 2 because the knife C has a shear angle D. Some of such loops may not be cut at all or partly cut. Such loops will be either cut again at different positions of the cutting edge or simply torn and will damage the backing cloth and carpet. So, the cut piles thus formed tend to have widely different lengths S from each other. Thus, during a later shearing step, a large amount of cut piles have to be removed by shearing so that the cut piles have to be removed by shearing so that the cut piles have uniform lengths. A large amount of yarn material is thus wasted. If the pile yarns are made of a material having no remaining elongation or a markedly low remaining elongation compared to ordinary tufting yarn, such as yarns for artificial turf, natural fiber yarns, and thick monofilaments, it is especially difficult to cut loops uniformly with conventional loopers having flat edges. Thus, large amounts of defective carpets tend to be produced. In the worst case, tufting is simply impossible. - A looper for use in a tufting machine comprising a hook throat portion having a bottom edge formed with a corrugation is known from
DE 37 09 977A1 . This known looper has a single corrugation located at the outward end of the bottom edge where the latter merges into the hook. This single corrugation has the purpose of avoiding a sharp edge directly behind the hook. - An object of the present invention is to provide a looper which can form cut piles having uniform lengths, and which allows the knife to reliably, precisely and cleanly cut all the required loops by the cutting edge which has various corrugated shapes and/or a rough surface.
- According to the present invention, there is provided a looper for use in a tufting machine comprising a hook throat portion having a bottom edge formed with corrugations or a rough surface along the entire length thereof or partly along the length thereof. The corrugations may have uniform pitches and heights, or may have uneven pitches and/or uneven heights. Preferably, the corrugations have pitches in the range of about 0.01 to 6 mm and heights in the range of about 0.01 to 2 mm.
- With this arrangement, the corrugations formed along the bottom edge of the hook throat portion will provide suitable resistance to loop piles hooked by the hook throat portion, thereby preventing the loop piles from being held in an unexpected position of the hook throat portion. This makes it possible to form loop piles having uniform lengths. Also, the corrugations will prevent the loop piles from sliding away from the knife, so that the loop piles can be reliably and precisely cut at constant positions. Thus, using the looper according to the present invention, it is possible to smoothly cut yarns which have been difficult to cut, such as single yarns having a large denier, monofilaments, filaments, tape yarns and natural fibers like cotton.
- Other features and objects of the present invention will become apparent from the following description, made with reference to the attached drawings, in which:
- Fig. 1 is a side of a looper embodying the present invention;
- Fig. 2 is a partial enlarged side view of a tufting machine on which the looper of Fig. 1 is mounted;
- Fig. 3 is a partial enlarged side view of the tufting machine of Fig. 2, showing how the looper of Fig. 1 operates;
- Figs. 4A to 4F and to are perspective views of portions of different loopers embodying the present invention, having their respective corrugations arranged so as to extend in different directions from each other;
- Figs. 4A' to 4C' are top plan views of Figs. 4A to 4C, respectively;
- Figs. 5A to 5C are side views of different loopers embodying the present invention; and
- Fig. 6 is a partial enlarged side view of a conventional looper.
- Now the embodiment of the present invention is described with reference to Figs. 1 to 5. As shown in Fig. 1, the
looper 10 according to the present invention comprises abase portion 11 supported on a looper block, which is described later, aneck portion 12 extending substantially vertically upwardly from thebase portion 11, and ahook throat portion 13 extending substantially horizontally from theneck portion 12 and having abottom edge 14 which is formed with corrugations along the entire length thereof or partly along the length thereof. The corrugations are typically formed with equal pitches p and heights h. But the corrugations may be formed such that their pitches and/or heights decrease gradually toward the tip of thehook throat portion 13. Preferably, the corrugations have heights h in the range of about 0.01 to 2 mm, more preferably in the range of about 0.1 to 2 mm, and pitches p in the range of about 0.01 to 6 mm, more preferably in the range of about 0.1 to 6 mm. - The
looper 10 according to the present invention is mounted on a looper block H of a tufting machine (in the case of a "mold" type, the looper is directly mounted on a looper bar LB). Loop piles B are formed on a backing cloth A which is being fed in the direction of the arrow in Fig. 2 by moving the looper block H back and forth, and vertically moving the knife C and the needle N, in synchronization with each other. When thelooper 10 is in the backward position, shown in Fig. 2, the knife C is raised to cut the piles B to form cut piles. When the piles B are cut by the knife C, the corrugations formed along theedge 14 provide suitable resistance to the respective piles B, thus preventing the piles B from sliding along theedge 14 away from the knife C even though the knife C has a shear angle D. Thus, the piles B can be cut reliably and precisely and smoothly at constant positions, so that cut piles of uniform lengths are formed. - Now referring to Figs. 4A to 4C and Figs. 4A' to 4C', the crests and troughs forming the corrugations may extend substantially parallel to the width direction of the
hook throat portion 13 of the looper (i.e. the direction perpendicular to the side surface of the looper to be brought into sliding contact with the knife C) as shown in Fig. 4A and 4A', or may extend obliquely toward or away from the tip of thehook throat portion 13 with respect to the width direction of thehook throat portion 13 as shown in Figs. 4B, 4B' and 4C, 4C'. By adjusting the inclination angle of the crests and troughs forming the corrugations with respect to the width direction of the hook throat portion, it is possible to adjust the movement of the pile yarns. - Referring next to Figs. 4D to 4F, the crests and troughs forming the corrugations may extend substantially horizontally (i.e. perpendicular to the height direction of the
hook throat portion 13 of the looper) as shown in Fig. 4D, or may extend obliquely upwardly or downwardly from the side surface of thehook throat portion 13 as shown in Figs. 4E and 4F. By adjusting the inclination angle of the crests and troughs of the corrugations with respect to the height direction of thehook throat portion 13, it is possible to extend the life of the knife C and to adjust the movement of the pile yarns and cutting energy. - The
looper 10 according to the present invention is not limited to the looper shown in Fig. 1. For example, thelooper 10 according to the present invention may include a vertically downwardly extendingbase portion 11 as shown in Fig. 5A, may include aspring 16 extending along agroove 18 formed in thebase portion 11 as shown in Fig. 5B, or may include aclip 17 connected to theneck portion 12 to sandwich loop piles between theclip 17 and thehook throat portion 13 as shown in Fig. 5C. Further, thelooper 10 according to the present invention may be of a molded modular type which comprises 5 to 20 loopers that are formed into a one-piece body by molding. - Instead of the corrugations, the bottom edge may be formed with a rough surface.
Claims (4)
- A looper (10) for use in a tufting machine comprising a hook throat portion (13) having a bottom edge (14) formed with a corrugation, characterised in that said bottom edge (14) is formed with a plurality of corrugations along the entire length thereof or partially along the length thereof.
- The looper (10) of claim 1 wherein said corrugations have uniform pitches (p) and heights (h).
- The looper (10) of claim 1 wherein said corrugations have uneven pitches (p) and/or uneven heights (h).
- The looper (10) of any of claims 1 to 3 wherein said corrugations have pitches (p) in the range of about 0.01 to 6 mm and height (h) in the range of about 0.01 to 2 mm.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT05020695T ATE364746T1 (en) | 2005-09-22 | 2005-09-22 | GRIPPER FOR TUFTING MACHINE |
EP05020695A EP1767683B1 (en) | 2005-09-22 | 2005-09-22 | Looper for tufting machine |
DE602005001402T DE602005001402T2 (en) | 2005-09-22 | 2005-09-22 | Gripper for tufting machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05020695A EP1767683B1 (en) | 2005-09-22 | 2005-09-22 | Looper for tufting machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1767683A1 EP1767683A1 (en) | 2007-03-28 |
EP1767683B1 true EP1767683B1 (en) | 2007-06-13 |
Family
ID=35801292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05020695A Not-in-force EP1767683B1 (en) | 2005-09-22 | 2005-09-22 | Looper for tufting machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1767683B1 (en) |
AT (1) | ATE364746T1 (en) |
DE (1) | DE602005001402T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014102801A1 (en) * | 2014-03-03 | 2015-09-03 | Groz-Beckert Kg | Profiled loop grab |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105780343A (en) * | 2016-05-23 | 2016-07-20 | 浙江大达家居用品有限公司 | Tufting machine |
CN105887377A (en) * | 2016-05-23 | 2016-08-24 | 浙江大达家居用品有限公司 | Lint hooking tool of tufting machine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4419944A (en) * | 1981-11-09 | 1983-12-13 | Passons William E | Multiple stroke looper mechanism for stitching machine |
DE3709977A1 (en) * | 1987-03-26 | 1988-10-13 | Carl Schlemper Gmbh & Co Kg | Loop gripper for tufting machines |
-
2005
- 2005-09-22 DE DE602005001402T patent/DE602005001402T2/en active Active
- 2005-09-22 EP EP05020695A patent/EP1767683B1/en not_active Not-in-force
- 2005-09-22 AT AT05020695T patent/ATE364746T1/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014102801A1 (en) * | 2014-03-03 | 2015-09-03 | Groz-Beckert Kg | Profiled loop grab |
DE102014102801B4 (en) * | 2014-03-03 | 2015-11-05 | Groz-Beckert Kg | Profiled loop grab |
Also Published As
Publication number | Publication date |
---|---|
ATE364746T1 (en) | 2007-07-15 |
DE602005001402D1 (en) | 2007-07-26 |
DE602005001402T2 (en) | 2007-10-31 |
EP1767683A1 (en) | 2007-03-28 |
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