EP0882830B1 - Präzisionsnähmaschine - Google Patents

Präzisionsnähmaschine Download PDF

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Publication number
EP0882830B1
EP0882830B1 EP19970830324 EP97830324A EP0882830B1 EP 0882830 B1 EP0882830 B1 EP 0882830B1 EP 19970830324 EP19970830324 EP 19970830324 EP 97830324 A EP97830324 A EP 97830324A EP 0882830 B1 EP0882830 B1 EP 0882830B1
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EP
European Patent Office
Prior art keywords
edge
sewing
edged
welt
machine 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.)
Expired - Lifetime
Application number
EP19970830324
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English (en)
French (fr)
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EP0882830A1 (de
Inventor
Renato Pandolfi
Mario Valle
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.)
Conti Complett SpA
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Conti Complett SpA
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Filing date
Publication date
Application filed by Conti Complett SpA filed Critical Conti Complett SpA
Priority to EP19970830324 priority Critical patent/EP0882830B1/de
Publication of EP0882830A1 publication Critical patent/EP0882830A1/de
Application granted granted Critical
Publication of EP0882830B1 publication Critical patent/EP0882830B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/06—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding
    • D05B35/062—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding with hem-turning
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members

Definitions

  • the present invention relates to a precision-stitch sewing machine for attaching a welt to an edge of a knitted or woven fabric or the like, along a predetermined sewing line, of the type comprising: means for feeding the edge to a sewing area of the machine; a draw unit for drawing both the welt and the edge to be edged, said unit being positioned downstream of the sewing area, for advancing the welt and the edge to be edged along the sewing line; a folding unit for folding the welt, said unit being positioned upstream of the sewing area with reference to the direction of advance of the welt along the sewing line, for folding the welt around the edge to which it is to be attached; a needle plate for supporting the welt and the edge in the sewing area; and a sewing unit positioned in the sewing area.
  • edges of a garment such as the neck, cuffs and waist of a pullover, are usually finished by a so-called edging operation in which a welt of knitted or woven fabric or the like is attached to the edge that requires finishing.
  • the edging operation can be done on linking machines which give an excellent finish to these edges.
  • these machines not only demand a high level of ability on the part of the person carrying out the edging operation but also have the drawback that linking each welt takes a considerable amount of time, such as to render their use economically worthwhile only with the more expensive garments.
  • the edging operation can also be done on precision-stitch sewing machines which quickly and economically attach a welt to the edge in question by a simulated linking operation.
  • the problem upon which the present invention is based is thath of devising a machine for performing the abovementioned edging operation, the structural and functional characteristics of which are such as to satisfy the abovementioned need and at the same time to solve the problems referred to earlier.
  • a precision-stitch sewing machine of the type specified characterized in that said means for feeding the edge are positioned upstream of the sewing area and in that said draw unit comprises: a transporting member defining, at least for a defined section close to the sewing area, a supporting surface for the welt and for the edge to which the latter is to be attached, and a draw roller cooperating with said transporting member for advancing the welt and the edge to be edged from the sewing area.
  • Said transporting member is preferably a first belt conveyor having a flat section close to the sewing area, which flat section forms a supporting surface for the welt and the edge to which the welt is to be attached and is caused to travel away from the sewing area.
  • Said draw roller preferably presses down on the flat section of the first belt conveyor so that the welt and the edge to which the welt is to be attached can be inserted between the belt conveyor and the draw roller downstream of the sewing area.
  • 1 is a general reference for a precision-stitch sewing machine according to the invention for attaching a welt 2 to an edge 3 to be edged of a garment, for example the waist of a pullover.
  • the machine 1 comprises a frame 4 supporting a horizontal work surface 5 with: a sewing unit 6, feed means 7 for feeding the edge 3 to be edged of the garment, a draw unit 8 for drawing the welt 2 and the edge 3 to be edged, and a folding unit 9 for causing the welt 2 to fold around the edge 3 to be edged of the garment.
  • the sewing unit 6 comprises a vertical column supporting an overhanging sewing head 10.
  • a bar 11 extends from the free end of the sewing head 10 towards the work surface 5 in a vertical direction Z-Z.
  • the bar 11 is caused to reciprocate in the vertical direction Z-Z by an electric motor of the machine 1 to which it is kinematically connected.
  • the bar 11 holds a needle 12 that extends in the vertical direction Z-Z.
  • the machine 1 Underneath the sewing head 10, the machine 1 comprises a needle plate 13 parallel to the work surface 5 and containing a vertical through hole to allow the needle 12 to descend as it sews.
  • a sewing area 15 defined between the sewing head 10 and the needle plate 13 is a sewing area 15, positioned upstream of which is the folding unit 9 and downstream of which is the draw unit 8.
  • the welt 2 advances through the sewing area 15 from upstream to downstream along a sewing line X-X to be sewn by the needle 12 to the edge 3 to be edged of the garment, as will be made clear later in the description.
  • the sewing line X-X is parallel to the needle plate 13 and passes through the vertical Z-Z in which the needle 12 lies.
  • the needle plate 13 is approximately rectangular and is oriented in such a way that its long sides lie in a direction Y-Y perpendicular to the sewing line X-X.
  • the aforesaid draw unit 8 that draws the welt 2 and the edge 3 to be edged comprises a transporting member 23 positioned immediately downstream of the sewing area 15, and a draw roller 16 cooperating with said transporting member 23 in order to advance the welt 2 and the edge 3 to be edged of the garment along the sewing line X-X.
  • the transporting member 23 is positioned in line with the sewing line X-X and, close to the sewing area 15, presents a flat section L which is straight and coplanar with the needle plate 13 (Fig.3).
  • This section L of the transporting member 23 provides a theoretical continuation of the needle plate 13, both for the welt 2 and for the edge 3 to be edged of the garment, downstream of the sewing area 15.
  • the transporting member 23 may advantageously extend in direction Y-Y across the entire width of the needle plate 13.
  • the transporting member 23 takes the form of a first belt conveyor comprising a flat belt 24 supported so as to run around a closed path defined by a plurality of pulleys and drive rollers, which are supported by the sewing unit 6 of the machine 1.
  • the belt conveyor is turned by an electric motor, preferably a stepper motor in such a way that when the machine 1 is running, the aforesaid flat section L of the flat belt 24 is travelling away from the sewing area 15.
  • the draw roller 16 is positioned immediately downstream of the needle plate 13, above the first belt conveyor and with its axis of rotation in the aforementioned direction Y-Y.
  • the draw roller 16 is mounted in such a way that it can move in a direction approximately perpendicular to the needle plate 13, so that the roller 16 is pressing against the flat belt 24 of the first belt conveyor.
  • the draw roller 16 is rotatably cantilever supported by a first end of a lever 25, which latter is free to rotate about a pivot 17 supported by the sewing unit 6.
  • the weight of the draw roller 16 therefore causes it to press down on the belt 24 below.
  • the load of the roller 16 on the flat belt 24 can be increased or reduced as required by acting on the lever 25 with suitably positioned spring means.
  • the draw roller 16 is turned by an electric motor, preferably of the stepper type, not shown in the figures, in such a way that its peripheral speed is approximately equal, plus or minus a small predetermined tolerance value, and opposite to that of the flat belt 24. This means that the welt 2 and the edge 3 to be edged can be drawn by the flat belt 24 and draw roller 16 at the same speed of advance.
  • the flat belt 24 of the transporting member 23 and the draw roller 16 can both be kinematically connected to the same motor, which turns them at equal and opposite peripheral speeds.
  • the drawer roller 16 preferably extends axially across the full width of the transporting member 23, i.e. of the flat belt 24.
  • the draw roller 16 may, in order to satisfy particular requirements extend axially less than the width of the flat belt 24 but must always extend beyond the sewing line X-X.
  • the second end of the lever 25 is preferably connected by a chain 26 to a pedal-type control device 14 mounted at the bottom of the frame 4. Operating the pedal control device 14 turns the lever 25 about the pivot 17 and raises the draw roller 16 from the flat belt 24 of the first belt conveyor, in order to facilitate the initial insertion of the welt 2 and of the edge 3 to be edged of the garment between the draw roller 16 and the flat belt 24, as will be made clear in the course of the description.
  • the feed means 7 for the edge 3 to be edged of the garment preferably comprise a second belt conveyor comprising a flat belt 18 supported so as to rotate around a closed path defined by a plurality of pulleys and drive rollers supported by the machine 1 frame.
  • the second conveyor belt is lined up with the sewing line X-X and, advantageously, is positioned entirely upstream of the sewing area 15.
  • the second belt conveyor Close to sewing area 15 the second belt conveyor presents a flat, straight section R coplanar with the needle plate 13 (Fig.3). Said section R of the flat belt 18 forms a theoretical extension of the needle plate 13 upstream of the sewing area 15. Since there are no problems with interference between the flat belt 18 and the needle 12, it is possible to use a wider flat belt 18 than is possible with the precision-stitch sewing machines of the prior art.
  • the second belt conveyor is turned by an electric motor, preferably d.c. type or brushless type, so that when the machine is running the flat belt 18 is advancing towards the sewing area 15 in the abovementioned section R.
  • an electric motor preferably d.c. type or brushless type
  • the speed of advance of the flat belt 18 of the feed means 7 is regulated so as to be approximately equal, plus or minus a small predetermined tolerance value, to that of the flat belt 24 of the transporting member 23.
  • the equivalence of these speeds is ensured by an electronic regulating and monitoring device known per se and capable of regulating the speed of rotation of the respective electric motors.
  • the feed means 7 for the edge 3 to be edged of the garment comprise, in order to satisfy particular needs, a smooth surface positioned in line with the sewing line X-X and coplanar with the needle plate (13) for at least a defined distance close to the sewing area 15.
  • the smooth surface is made of a material with a low coefficient of friction so that the edge 3 to be edged of the garment slides easily over it during the edging operation.
  • the folding unit 9 comprises a tubular component 19, known per se, into which is inserted the edging 2 which is directed to the sewing region 15 .
  • Deflection tongues 20 attached to the tubular component 19 act on the welt 2 as it leaves the tubular component 19 forcing it to fold itself into a C along the sewing line X-X with both edges 22 parallel to the sewing line X-X and its concave side toward this line (Fig.4).
  • the welt 2 approaching the sewing area 15 is constrained to fold itself around the edge 3 to be edged of the garment as the latter is fed into the sewing area by the flat belt 18, the edges 22 and the outer curve 21 of the welt 2 obviously ending up on opposite sides of the sewing line X-X.
  • the needle plate 13 comprises guide components, known per se and not illustrated in the figures, for checking and guiding the outer curve 21 of the welt 2 during its advance through the sewing area 15.
  • the machine 1 also comprises electrical, regulating and monitoring devices to keep it running effectively. These devices are known per se and are not described below.
  • edge 3 to be edged of the garment is positioned by an operator on the flat belt 18 of the feed means 7 which then carries it towards the sewing area 15.
  • This positioning of the garment is done in such a way that in the abovementioned flat section R close to the sewing area 15, edge 3 to be edged of the garment extends a defined short distance A beyond the sewing line X-X to which it is parallel.
  • the edge 3 to be edged of the garment passes from the feed means 7 to the needle plate 13 as it progresses down the sewing line X-X.
  • the welt 2 coming out of the folding unit 9 is folded around the edge 3 to be edged of the garment and carried forward with the latter along the sewing line X-X.
  • the needle 12 obviously sews the welt 2 to the edge 3 to be edged of the garment while these are passing below the sewing head 6 (Fig.4).
  • the welt 2 and the edge 3 to be edged of the garment now sewn together enter between the belt 24 of the transporting member 23 and the draw roller 16 which together draw them along. Among other things this creates a continuous advancing movement of the welt 2 from the folding unit 9 to the sewing area 15.
  • the vertical distance between the draw roller 16 and the flat belt 24 is determined by the thickness of the welt 2 and of the edge 3 to be edged of the garment.
  • the draw roller 16 is shown pressing down on the welt 2, although in reality the weight of the draw roller 16 causes it also to contact that part of the garment not enclosed by the welt 2.
  • the draw unit 8 of the machine 1 enables the welt 2 and the edge 3 to be edged of the garment to be acted upon close to the sewing area 15 and at the same time provides the welt 2 and edge 3 to be edged of the garment with an extension of the needle plate 13 as they recede from the sewing area 15 for the whole of the section L downstream of the sewing area 15. It is easy to see that this prevents unwanted and unsightly deviations of the line of stitches from developing in the parts yet to be stitched as a result of the removal of the welt 2 and edge 3 to be edged of the garment from the sewing area 15 after being stitched together.
  • the draw roller 16 advantageously extends axially across the full width of the flat belt 24 so that it can work with said belt 24 of the first conveyor in order also to advance the garment to which the welt is to be attached.
  • the sewing machine 1 can be used for the finishing of edges 3 to which a finishing piece 27, e.g. of leather has previously been sewn and which when the edge is finished must project from the outer edge 22 of the welt 2 (Fig.6).
  • a finishing piece 27, e.g. of leather has previously been sewn and which when the edge is finished must project from the outer edge 22 of the welt 2 (Fig.6).
  • edging of this sort involves an initial sewing operation (Fig.5) in which the finishing piece 27 is sewn onto the edge 3 of the garment, followed by a sewing operation in which the welt 2 is folded around both the edge 3 to be edged of the garment and the finishing piece 27 and sewn to both (Fig.6).
  • the precision-stitch sewing machine overcomes the abovementioned need without introducing the disadvantages of prior-art machines, because this machine avoids those unwanted and unsightly deviations of the line of stitches caused by imperfect and varying alignment, during the course of the sewing operation, of the welt relative to the edge to be edged of the garment along the sewing line X-X.
  • Another advantage of the precision-stitch sewing machine according to the invention is that it is able to advance the welt and the edge to be edged of the garment simultaneously and equally after sewing.
  • Another advantage of the precision-stitch sewing machine according to the invention is that it is structurally and functionally simple, and therefore reliable in operation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (16)

  1. Präzisionsnähmaschine zum Befestigen eines Saums (2) an einer zu säumenden Kante (3) eines gewirkten bzw. gewebten Gewebes oder ähnlichem längs einer vorbestimmten Nählinie (X-X) des Typs, welcher umfaßt:
    eine Zuführeinrichtung (7) zum Zuführen der zu säumenden Kante (3) zu einem Nähbereich (15) der Maschine (1),
    eine Zugeinheit (8) zum Ziehen sowohl des Saums (2) als auch der zu säumenden Kante (3), wobei die Zugeinheit in Beförderungsrichtung hinter dem Nähbereich (15) angeordnet ist, um den Saum (2) und die zu säumende Kante (3) längs der Nählinie (X-X) vorzurücken,
    eine Falteinheit (9) zum Falten des Saums (2), wobei die Einheit in Bezug auf die Beförderungsrichtung des Saums (2) längs der Nählinie (X-X) vor dem Nähbereich (15) angeordnet ist, um den Saum (2) um die zu säumende Kante (3), an welcher dieser zu befestigen ist, zu falten,
    eine Nadelplatte (13) zum Lagern des Saums (2) und der zu säumenden Kante (3) in dem Nähbereich (15) und
    eine Näheinheit (6), welche in dem Nähbereich (15) angeordnet ist,
    dadurch gekennzeichnet, daß die Einrichtung (7) zum Zuführen der zu säumenden Kante (3) in Beförderungsrichtung vor dem Nähbereich (15) angeordnet ist und die Zugeinheit (8) umfaßt:
    ein Beförderungselement (23), welches mindestens für einen definierten Abschnitt (L) in der Nähe des Nähbereichs (15) eine Auflagefläche für den Saum (2) und für die zu säumende Kante (3) definiert, und
    eine Zugrolle (16), welche mit dem Beförderungselement (23) zum Vorrücken des Saums (2) und der zu säumenden Kante (3) aus dem Nähbereich (15) zusammenwirkt.
  2. Maschine nach Anspruch 1, wobei das Beförderungselement (23) in Linie mit der Nählinie (X-X) angeordnet ist.
  3. Maschine nach Anspruch 1, wobei der definierte Abschnitt (L) des Beförderungselements (23) koplanar mit der Nadelplatte (13) ist.
  4. Maschine nach einem der vorangehenden Ansprüche, wobei das Beförderungselement (23) eine erste Bandfördervorrichtung ist, welche einen flachen Abschnitt (L) in der Nähe des Nähbereichs (15) aufweist, wobei der flache Abschnitt (L) eine Auflagefläche für den Saum (2) und die zu säumende Kante (3) bildet und bewirkt wird, daß dieser sich von dem Nähbereich (15) fort bewegt.
  5. Maschine nach Anspruch 1, wobei das Beförderungselement (23) durch eine Antriebseinrichtung bewegt wird.
  6. Maschine nach Anspruch 4, wobei die Zugrolle (16) nach unten auf den flachen Abschnitt (L) der ersten Bandfördervorrichtung drückt, wobei das Zuführen des Saums (2) und der zu säumende Kante (3) in Beförderungsrichtung hinter dem Nähbereich (15) zwischen der ersten Bandfördervorrichtung und der Zugrolle (16) erfolgt.
  7. Maschine nach Anspruch 6, wobei die Zugrolle (16) in der Nähe des Nähbereichs (15) angeordnet ist.
  8. Maschine nach Anspruch 6, wobei sich die Zugrolle (16) in Axialrichtung über die volle Breite der Bandfördervorrichtung erstreckt.
  9. Maschine nach Anspruch 6, wobei die Zugrolle (16) durch eine Antriebseinrichtung bewegt wird.
  10. Maschine nach Anspruch 1, wobei die Einrichtung (7) zum Zuführen der zu säumenden Kante (3) eine zweite Bandfördervorrichtung umfaßt, welche mindestens für einen definierten Abschnitt (R) in der Nähe des Nähbereichs (15) eine Auflagefläche für die zu säumende Kante (3) definiert, wenn diese zu dem Nähbereich (15) vorgerückt wird.
  11. Maschine nach Anspruch 10, wobei die zweite Bandfördervorrichtung in Linie mit der Nählinie (X-X) angeordnet ist und der definierte Abschnitt (R) koplanar mit der Nadelplatte (13) ist.
  12. Maschine nach Anspruch 10, wobei die zweite Bandfördervorrichtung durch eine Antriebseinrichtung bewegt wird.
  13. Maschine nach Anspruch 4 oder 10, wobei die Bandfördervorrichtung ein flaches Band (18; 24) umfaßt, welches durch eine Vielzahl von Laufrollen und Antriebsrollen drehbar gelagert ist.
  14. Maschine nach einem der vorangehenden Ansprüche, wobei die Vorrückgeschwindigkeit der zu säumenden Kante (3) durch die Zuführeinrichtung (7) etwa gleich groß wie die Geschwindigkeit, mit welcher der Saum (2) und die zu säumende Kante durch die Zugeinheit gezogen werden, ist.
  15. Maschine nach Anspruch 1, wobei die Einrichtung (7) zum Zuführen der zu säumenden Kante (3) eine glatte Fläche umfaßt, welche in Linie mit der Nählinie (X-X) angeordnet ist, wobei die glatte Fläche mindestens im Bereich einer definierten Entfernung in der Nähe der Nadelplatte koplanar mit der Nadelplatte ist.
  16. Maschine nach Anspruch 15, wobei die glatte Fläche aus einem Material mit einem geringen Reibungskoeffizienten besteht.
EP19970830324 1997-06-03 1997-06-30 Präzisionsnähmaschine Expired - Lifetime EP0882830B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970830324 EP0882830B1 (de) 1997-06-03 1997-06-30 Präzisionsnähmaschine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97830271 1997-06-03
EP97830271 1997-06-03
EP19970830324 EP0882830B1 (de) 1997-06-03 1997-06-30 Präzisionsnähmaschine

Publications (2)

Publication Number Publication Date
EP0882830A1 EP0882830A1 (de) 1998-12-09
EP0882830B1 true EP0882830B1 (de) 2001-11-28

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EP19970830324 Expired - Lifetime EP0882830B1 (de) 1997-06-03 1997-06-30 Präzisionsnähmaschine

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008154670A (ja) * 2006-12-21 2008-07-10 Juki Corp ミシンのテープ送り装置
CN105040287A (zh) * 2015-08-18 2015-11-11 深圳市德业自动化科技有限公司 一种用于口袋卷边与缝纫的自动设备
CN107881667A (zh) * 2017-11-30 2018-04-06 苏州翰德利机电科技有限公司 一种缝纫***及用于连接缝纫设备的输送装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2848123C2 (de) * 1978-11-06 1983-10-06 Duerkoppwerke Gmbh, 4800 Bielefeld Nähmaschine mit einem oberen und einem unteren Transportband
IT1159823B (it) * 1983-01-10 1987-03-04 Exacta Spa Macchina cucitrice a punti precisi
IT1206766B (it) * 1987-03-18 1989-05-03 Exacta Spa Macchina cucitrice a punti precisi, in particolare per l'applicazione di bordature in maglia o tessuto a capi di abbigliamento
IT1270014B (it) * 1994-09-26 1997-04-16 Conti Complett Spa Macchina cucitrice a punti precisi,particolarmente per l'applicazione di bordi in maglia a capi di abbigliamento o simili.

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