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

• the invention relates to a sewing machine with a thread manager assembly.
• Sewing machines are known in many designs, for example from EP 3 088 589 B1, EP 3 360 994 A1, US 6 276 289 B1 and DE 10 2013 107 270 B3.
• DE 20 2012 104 187 U1 discloses a chain stitch sewing machine.
• DE 87 13 500 U1 discloses a double chainstitch sewing machine with Grei fer and looper thread spreader.
• thread starting sections at the beginning of the seam can be pulled away in a controlled manner by sewing material to be sewn from a sewing material viewing area. In the field of vision, there is then no thread starting section which would disturb the visual appearance.
• the sewn seam begins with a neat stitch.
• the fingertip of the at least one thread finger is in the Sehlingen-engaging position between a gripper and a throat plate of the sewing machine. Such an arrangement of the fingertip of the at least one thread finger enables the thread loop to be gripped securely.
• the loop pull-out position of the at least one thread finger can at the same time be a neutral position of the thread finger, in which it can remain after its use at the start of the seam during further sewing.
• the thread loop that is pulled out from the thread finger of the thread finger assembly can be an upper thread loop.
• the thread finger can be designed with low strength.
• a curved design of the at least one thread finger according to claim 2 means that the thread finger only takes up very little space when it is moved in the critical stitch formation area.
• the curvature of the curved thread finger can be adapted with regard to its curvature to a displacement movement of the thread finger, so that a movement path of the thread finger at least approximates how the thread finger is curved.
• a catcher hook according to claim 3 has been found to be particularly suitable for the secure detection of the Fa denschling.
• a thread finger assembly with two thread fingers according to claim 4 can be used together with a two-needle sewing machine.
• a link guide according to claim 5 has been shown to be particularly suitable for the reproducible and rapid guidance of the displacement movement.
• an electric motor drive can also be used as the thread finger drive.
• the sewing machine can be a chain stitch sewing machine and in particular a double chain stitch sewing machine.
• a strength of the thread finger according to claim 7 allows a gripper tip of the gripper to lead close to the throat plate in spite of the finger tip of the thread finger lying between the loop engaging section, which makes it possible to work with short thread loops and, accordingly, possible short thread Beginning sections and thread end sections leads.
• the distance between the gripper and the stitch plate where the thread finger engages between these two components only needs to be made slightly larger than the strength of the Fa denfingers, for example at most 2 mm greater than the strength of the Fa denfingers.
• the thickness of the thread finger in the direction of the distance between tween the gripper and the throat plate is preferably at most 1.8 mm and can in particular be at most 1.5 mm.
• a small width of the thread finger according to claim 8 allows a clean engagement even with small thread loops, which in turn reduces the ma
• the maximum length of thread required for the thread loop is advantageously kept small.
• the width of the thread finger across its longitudinal extension can be less than 4 mm, can be less than 3 mm and can also be less than 2 mm.
• Fig. 1 is a perspective view of the main components of a sewing machine
• Sewing unit for sewing in particular multi-dimensional seams lying in space
• Fig. 2 from a viewing direction similar to FIG. 1 enlarged a Fa denfinger assembly of the sewing machine, the thread fingers of the thread finger assembly are in a loop engagement position for engagement in thread loops generated by the sewing machine in a Stich avoirsbe rich;
• Fig. 3 is a perspective view in an end view of stitch formation components of the sewing machines including the thread fingers, again in the loop engagement position;
• Fig. 4 in a view similar to Fig. 3, the stitch formation components with the thread fingers of the thread finger assembly in egg ner loop pull-out position, which is displaced obliquely downward from the loop-engaging position for pulling out the thread loops from the stitch formation area; and 5 shows a side view from the viewing direction V in FIG. 1 of the stitch formation components according to FIGS. 3 and 4, the thread fingers being displaced from the loop engagement position.
• a sewing system is used for sewing multi-dimensional and in particular not three-dimensional seams lying in space.
• An application example for the sewing system is the attachment of seam applications in the interior of vehicles, for example on instrument panels, door side panels or armrests.
• the sewing system includes a sewing machine 1, of which the main components are shown in FIG.
• the sewing machine 1 is carried by an arm of a robot, not shown in detail, with which the sewing machine 1 can be controlled in any way in five or six degrees of freedom in space.
• the sewing machine 1 is a double chain stitch sewing machine.
• a Kar tesian xyz coordinate system is indicated in each of the figures.
• the x-axis along which the seam is generated in an initial position by stitch-forming tools described in more detail below, runs obliquely to the left in FIG. 1.
• the y-axis runs obliquely to the front left in FIG. 1 and the z-axis runs upward in FIG. 1.
• the sewing machine 1 has a housing 2 with a C-shaped basic structure parallel to the yz plane with an upper housing part 3, a lower housing part 4 and a stand 5 connecting these two parts to form a C-shape.
• the upper housing part 3 and the lower housing part 4 run along the y -Direction.
• the stand 5 runs along the z-direction.
• the sewing machine 1 has two sewing needles 6 as stitch formation components,
• the needle bar 8 is mounted in a needle bar upper part parallel to the z-axis in the upper housing part 3, driven up and down.
• Fig. 5 which are mounted on a lower gripper part 11, driven synchronously with the sewing needles 6, 7 for stitch formation.
• the grippers 9, 10 are designed as oscillating or pendulum grippers that oscillate about an axis parallel to the y-axis.
• the grippers 9, 10 can be designed to form a chain stitch.
• the grippers 9, 10 can be designed as inline grippers.
• the lower gripper part 11 forms a column of the sewing machine 1.
• the lower gripper part 11 is mounted on the lower housing part 4. Due to the column design of the lower gripper part 11, a stitch formation area in which the seam is produced with the sewing machine 1 is very freely accessible from all sides.
• the two sewing needles 6, 7 are driven up and down along a longitudinal axis of the needle bar.
• a pivoting movement of the grippers 9, 10 is driven synchronously with this.
• the two sewing needles 6, 7 penetrate stitch holes in a needle plate 11a on which the material to be sewn rests when the stitch is formed.
• the throat plate 11a is arranged above the gripper lower part 11 with the two grippers 9, 10 and is designed to be complementary to the oscillating movement of the grippers 9, 10.
• the sewing machine 1 has a thread finger assembly 12, which is shown as a whole in FIG.
• the thread finger assembly 12 is used to pull an upper thread 13 (cf. FIG. 4) down from a sewing material viewing area after a first stitch of the sewing machine 1 and thus ensures a neat seam appearance.
• the thread finger assembly 12 has two thread fingers 14, 15. Each of these thread fingers 14, 15 is assigned to one of the two stitch formation component pairings sewing needle 6 / gripper 9 and sewing needle 7 / gripper 10. At their free ends, the two thread fingers 14, 15 each have a Fa the catcher hook 15a. An extension of the thread fingers 14, 15 along the z-direction, that is to say a thickness of the thread fingers, is at most 2 mm. A width of the thread fingers 14, 15 along the y-direction is at most 5 mm.
• the two thread fingers 14, 15 are driven and switchable between a loop engagement position shown in FIGS. 1 to 3 and a loop pull-out position which is rela tively relocated downward to this and which is shown in FIG.
• the thread fingers 14, 15 engage in a thread loop of the respective upper thread 13 produced by the sewing machine 1 in the stitch formation area.
• the thread finger 14 engages in the upper thread loop, which is guided by the sewing needle 6 and the thread finger 15 into the upper thread loop that is guided by the sewing needle.
• the water engagement takes place below the sewing material hanging on the throat plate.
• the fingertips of the two thread fingers 14, 15 lie between the respective gripper 9, 10 and the throat plate 11a.
• the two thread fingers 14, 15 are rela tively to the loop engagement position for pulling the upper thread loops from the stitch formation area, as a comparison of FIGS. 3 and 4 shows.
• the two thread fingers 14, 15 are designed to be curved.
• a curvature of the thread fingers 14, 15 is adapted in terms of its curvature to a curvature of a displacement movement between the loop engagement position and the loop withdrawal position.
• a movement path of the thread fingers 14, 15 thus runs approximately like the thread fingers 14, 15 are curved.
• This trajectory and the curvature of the thread fingers 14, 15 are in turn complementary to the curved design of the throat plate 11a and the oscillating movement of the grippers 9, 10, so that the thread finger movement is possible undisturbed in the small installation space between the throat plate 11a and the grippers 9, 10.
• This movement path of the displacement movement of the thread fingers 14, 15 is predetermined via a link guide 16.
• the latter comprises a curved slot 17 which is parallel to the xz plane.
• two guide bolts of a driver lever 19 are guided, on which a thread finger carrier 20 is fixed.
• the driver lever 19 is articulated via a connecting lever 21 to a piston rod 22 of a double-acting pneumatic cylinder 23. the.
• a transmission movement of the connecting lever 21 is guided in a large body 24 via an elongated hole 25 running parallel to the y-direction.
• the pneumatic cylinder 23 represents a thread finger drive 26 of the threadfmger assembly 12.
• the threadfmger assembly 12 is mounted on the housing lower part 4 of the sewing machine 1 via the grand body 24.
• the sewing machine 1 works with the thread manager assembly 12 as follows:
• the thread fingers 14, 15 are then transferred from a neutral position, which can coincide with the loop pull-out position, into the loop engagement position (cf., for example, FIG. 3).
• the fingers of the thread fingers 14, 15 penetrate into the upper thread loops formed.
• the piston rod 22 of the pneumatic cylinder 23 is extended. Following this, the thread fingers are brought back into the loop pull-out position by pulling in the piston rod 22, the catcher hooks 15a taking the respective upper thread 13 with them and pulling an upper thread down through the sewing material out of the sewing material viewing area.
• the thread fingers remain in the loop pulled-out position or the neutral position.
• the sewing head of the sewing machine 1 with the arm of the robot is shifted three-dimensionally in space, so that seam locations that are difficult to access can also be reached.

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=69941391

Family Applications (1)

Country Status (6)

Citations (7)

Family Cites Families (3)

• 2019
  • 2019-04-12 DE DE102019205303.3A patent/DE102019205303A1/de active Pending
• 2020
  • 2020-03-20 US US17/602,762 patent/US20220178062A1/en not_active Abandoned
  • 2020-03-20 JP JP2021560395A patent/JP2022526681A/ja active Pending
  • 2020-03-20 EP EP20713277.0A patent/EP3953518A1/de active Pending
  • 2020-03-20 CN CN202080027853.8A patent/CN113710844B/zh active Active
  • 2020-03-20 WO PCT/EP2020/057855 patent/WO2020207769A1/de unknown

Patent Citations (7)

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