US3722438A - Sewing machine with multi-needle supporting arm - Google Patents

Sewing machine with multi-needle supporting arm Download PDF

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Publication number
US3722438A
US3722438A US00106677A US3722438DA US3722438A US 3722438 A US3722438 A US 3722438A US 00106677 A US00106677 A US 00106677A US 3722438D A US3722438D A US 3722438DA US 3722438 A US3722438 A US 3722438A
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United States
Prior art keywords
thread
loop
sewing
gripper
needles
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
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US00106677A
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English (en)
Inventor
F Schinzel
H Schwannecke
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KUKA AG
Original Assignee
Industrie Werke Karlsruhe Ausburg AG
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Filing date
Publication date
Application filed by Industrie Werke Karlsruhe Ausburg AG filed Critical Industrie Werke Karlsruhe Ausburg AG
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Publication of US3722438A publication Critical patent/US3722438A/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
    • D05B1/10—Double chain-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating

Definitions

  • a horizontal thread spreader fixedly attached to and moving with the material feeder extends with one end provided with a holding tongue into the thread loop to hold the latter temporarily during the rearward movement of the thread gripper, so as to provide an additional length of lower thread on one side of the row of needles which supply the upper thread, said additional length of lower thread is necessary for producing a seam.
  • Multineedle sewing machines are employed for producing elastic seam connections in woven goods, knitted goods and the like and are also used, for instance, for sewing elastic bands to elastic materials.
  • the seam connections it is required, particularly in garments, that no appreciable impairment of the own elasticity of the sewing materials takes place.
  • it is an important requirement that for the sake of great elasticity and also for a faultless formation of such a seam connection a sufficient amount or length of lower thread is available which by a gripper moving in the same cycle as the sewing needles will be formed into a thread loop which is disposed below the throat plate and into which for the purpose of forming a seam the needles enter with the upper thread therein.
  • Sewing machines with multineedle supporting arms are employed particularly for the production of elastic seams in tube-shaped garments-such as sleeves or the like.
  • the seam connections produced in such type of machines do not meet the today requirements of the textile industry.
  • the thread loop is tensioned by engaging the needle disposed outside of the reversing point of the gripper point, whereby the lower thread length is fixed.
  • the needle about which the thread loop has been placed and is tensioned does not guide an upper thread so that for the formation of the seam there is available a needle which guides an upper thread at a double distance from this empty needle, so that a correspondingly additional lower thread length is available.
  • An object of the invention is a supporting arm sewing machine which operates without any empty needles and avoids the disadvantages of the same, whereby however the elasticity and the appearance of the seams will be in accordance with that required of modern textile products.
  • the invention therefore, relates to a sewing machine with a multineedle supporting arm provided with an oscillating gripper moving transversely to the sewing direction for the purpose of forming a thread loop into which needles enter which each guide an upper thread.
  • a thread spreader is employed which holds the thread loop in the range of the gripper reversing point at least over a substantial portion of the rearward movement of the gripper.
  • the thread spreader which seizes the thread loop after formation of the same in the range of the gripper reversing point holds the thread loop until the gripper has been returned such a distance that a tightening of the formed thread loop can no longer take place.
  • This thread spreader obviously is disposed below the throat plate of the sewing machine and is movable between its holding and release position in the same cycle as the gripper movement.
  • the thread spreader in a simple manner is constructed as a holding tongue which is reciprocable in the sewing direction of the sewing machine in such a manner that the spreader at the moment the gripper returns enters laterally into the thread loop which is being formed, so that the lower thread is tensioned over the holding tongue and thereby in view of the axial movement given the gripper, which is superimposed to the rearward movement of the same, is approximately triangularly tensioned.
  • the holding tongue is withdrawn from the thread loop and the continued sewing operation takes place by employing the lower thread which now is available in sufficient length.
  • Another object of the invention is to construct the thread spreader as a wire hoop which is disposed substantially in the horizontal plane of the thread loops and has a U-shaped section which approximately faces away from the reversing point of the gripper point and whose free end of one leg is provided at its rear end at the mentioned reversing point with a lateral offset which serves as a holding tongue.
  • Still another object of the invention resides in this that the thread spreader is fixedly connected with the feeder which advances the sewing material so that no special drive mechanism is required for this thread spreader.
  • the described arrangement of the thread spreader of the invention has the result that a supporting arm sewing machine is produced in which in a very simple manner and without a special enlargement of the size of the supporting arm a sufficient length of the bottom thread is assured without employing any empty needles as it was heretofore considered necessary in sewing machines of this type, whereby at the same time a satisfactory sewing of the sewing material is assured.
  • FIG. 1 illustrates in a perspective view a supporting arm of a sewing machine together with seam-forming parts, but without the throat plate, in which the thread gripper for forming the thread loop is illustrated in a fully outwardly pivoted position.
  • FIG. 2 illustrates a view similar to FIG. 1, but illustrates a position in which the thread spreader is introduced into the thread loop, while the thread gripper performs its rearward movement;
  • FIG. 3 illustrates also a perspective view similar to FIG. 1 in which, however, the thread spreader has released the thread loop and the upper threads have been introduced into the thread loop, while the thread gripper is illustrated in its withdrawn position.
  • a horizontally disposed gripper shaft 11 which has fixed thereto a thread gripper 12.
  • the free or upwardly extending end of the thread gripper 12 comprises an upper arc-shaped section 13 which oscillates below the not-illustrated throat plate during the rotation of the gripper shaft 11 between the end positions shown in the FIGS. 1 and 3, respectively, and in a direction substantially at right angles or vertical to the horizontal direction of the seam, which direction is indicated by an arrow 14.
  • the upper section 13 of the thread gripper 12 moves to and fro.
  • the lower thread 15 is guided toward the gripper 12 by a thread guide 16 and after passing through a not-illustrated additional guide passes through a guide aperture 17 in the outer end of the gripper section 13. From this gripper section 13 the thread is guided substantially upwardly for the purpose of forming the substantially horizontally disposed thread loop 18.
  • the movement of the sewing material is accomplished in known manner by a feeder 19 in the direction of the arrow 14.
  • the thread spreader 20 is constructed as a wire hoop and is provided with a U-shaped section 21 arranged substantially in the same horizontal plane in which the thread loop 18 is formed.
  • the curved portion of the U- shaped section extends approximately in the advancing direction of the gripper section 13 and toward the side remote from the seamforming members proper.
  • the free ends of the two spaced legs of the U-shaped section 21 are approximately bent at a right angle in the sewing direction and in opposite directions. One of these bent free ends of the legs extends approximately into the range of the reversing point of the thread guiding aperture 17 in the thread guide section 13 toward the direction of the thread loop 18 formed by the thread gripper 12 and constitutes a holding tongue 22 having a very short length in axial direction of the thread spreader 20.
  • the rectangularly bent free end of the other leg forms a long fastening rod 23 which extends in the longitudinal direction of the support 24 (FIG. 2) and parallel to the sewing direction of the feeder'19.
  • This fastening rod 23 extends adjacent the stitch-forming members through a bracket 25 which is fixedly attached to the feeder 19 and in spaced rearwardly relation to this bracket 25 the rod 23 is attached by a holding screw 26 to the support 24 in such a manner that an axial adjustment of the rod 23 and therewith of the thread spreader 20 in relation to the support 24, can be accomplished within specific limits.
  • FIG. 1 the needles 27, which are attached to an upwardly and downwardly movable vertical needle bar, are out of engagement with the sewing material; and the thread gripper 12 for the purpose of forming a loop has been pivoted into one of its end positions.
  • the thread spreader 20, which is fixedly attached to the feeder 19 will be moved in axial direction in such a manner that its holding tongue 22 engages the returning thread portion of the thread loop 18 above the thread gripper section 13.
  • FIG. 2 illustrates particularly that the thread gripper 12 during the start of its rearward movement performs a slidable movement in axial direction with respect to the support 24 of the feeder 19 in the manner disclosed in the above mentioned patent so that a triangular thread loop 18 is formed into which enter the sewing needles 27 during the continuous sewing operation as illustrated in FIG. 3.
  • Each of these sewing needles 27 carry an upper thread.
  • the feeder 19 and the thread spreader 20 fixedly attached thereto move together with the feeder 19 rearwardly from the sewing area, whereby the holding tongue 22 of the thread spreader 20 is withdrawn from the thread loop 18 so that the thread loop 18 is released.
  • the seam proper is then produced in customary manner, but compared with conventional sewing machines there has been made available as additional lower thread material the thread loop section 18.
  • said thread spreader comprises a wire member having a substantially U-shaped section disposed in the plane of the thread loop to be formed and having one leg of said U-shaped section bent to form said holding tongue, while the other leg is bent to form a rod section 10 which is longitudinally adjustably secured to said feeder.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00106677A 1970-01-21 1971-01-15 Sewing machine with multi-needle supporting arm Expired - Lifetime US3722438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7001852U DE7001852U (de) 1970-01-21 1970-01-21 Mehrnadeltragarm-naehmaschine.

Publications (1)

Publication Number Publication Date
US3722438A true US3722438A (en) 1973-03-27

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Application Number Title Priority Date Filing Date
US00106677A Expired - Lifetime US3722438A (en) 1970-01-21 1971-01-15 Sewing machine with multi-needle supporting arm

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US (1) US3722438A (de)
DE (1) DE7001852U (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520018A1 (fr) * 1982-01-16 1983-07-22 Union Special Gmbh Machine a coudre comportant une navette et un ecarteur qui agit sur le fil de la navette
US4977842A (en) * 1988-05-31 1990-12-18 Brother Kogyo Kabushiki Kaisha Overlock sewing machine with a threading mechanism for easily threading a looper
EP0582214A2 (de) * 1992-08-05 1994-02-09 PILLER, Helmut Vorrichtung zur Herstellung von Tuftingware
EP0737770A2 (de) * 1995-04-12 1996-10-16 Pegasus Sewing Machine Mfg. Co., Ltd. Verfahren und Vorrichtung zum Überwachen des Greiferfadens einer Doppelkettenstichnähmaschine
US20100192822A1 (en) * 2009-01-30 2010-08-05 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like employing curved sewing needles with corresponding movement of needle bars
US20110000413A1 (en) * 2009-07-01 2011-01-06 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US726310A (en) * 1901-02-28 1903-04-28 Hermann A Klemm Loop-spreader mechanism for sewing-machines.
US1929323A (en) * 1926-06-05 1933-10-03 Union Special Maschinenfab Apparatus for forming enchained stitching loops
US2975737A (en) * 1957-07-03 1961-03-21 Union Special Machine Co Sewing machine with looper thread retainer
US3301206A (en) * 1963-02-21 1967-01-31 Duerkoppwerke Chain-stitch sewing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US726310A (en) * 1901-02-28 1903-04-28 Hermann A Klemm Loop-spreader mechanism for sewing-machines.
US1929323A (en) * 1926-06-05 1933-10-03 Union Special Maschinenfab Apparatus for forming enchained stitching loops
US2975737A (en) * 1957-07-03 1961-03-21 Union Special Machine Co Sewing machine with looper thread retainer
US3301206A (en) * 1963-02-21 1967-01-31 Duerkoppwerke Chain-stitch sewing machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2520018A1 (fr) * 1982-01-16 1983-07-22 Union Special Gmbh Machine a coudre comportant une navette et un ecarteur qui agit sur le fil de la navette
US4977842A (en) * 1988-05-31 1990-12-18 Brother Kogyo Kabushiki Kaisha Overlock sewing machine with a threading mechanism for easily threading a looper
EP0582214A2 (de) * 1992-08-05 1994-02-09 PILLER, Helmut Vorrichtung zur Herstellung von Tuftingware
EP0582214A3 (en) * 1992-08-05 1994-07-20 Helmut Piller Apparatus for making tufted products
EP0737770A2 (de) * 1995-04-12 1996-10-16 Pegasus Sewing Machine Mfg. Co., Ltd. Verfahren und Vorrichtung zum Überwachen des Greiferfadens einer Doppelkettenstichnähmaschine
EP0737770A3 (de) * 1995-04-12 1997-06-11 Pegasus Sewing Machine Mfg Co Verfahren und Vorrichtung zum Überwachen des Greiferfadens einer Doppelkettenstichnähmaschine
US20100192822A1 (en) * 2009-01-30 2010-08-05 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like employing curved sewing needles with corresponding movement of needle bars
US8695518B2 (en) * 2009-01-30 2014-04-15 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like employing curved sewing needles with corresponding movement of needle bars
US20110000413A1 (en) * 2009-07-01 2011-01-06 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like
US8925474B2 (en) * 2009-07-01 2015-01-06 Alberto Landoni Machine and method for sewing, embroidering, quilting and/or the like

Also Published As

Publication number Publication date
DE7001852U (de) 1970-05-06

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