Classifications

• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B85/00—Needles
  • D05B85/06—Curved needles
• • 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
• • 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
  • D05B1/12—Lock-stitch seams
• • 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
  • D05B1/24—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making blind-stitch seams
• • D—TEXTILES; PAPER
  • D05—SEWING; EMBROIDERING; TUFTING
  • D05B—SEWING
  • D05B57/00—Loop takers, e.g. loopers
  • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
  • D05B57/22—Loop takers, e.g. loopers for lock-stitch sewing machines with spool-size bobbin for lower thread

Definitions

• the invention relates to a sewing machine with a bow needle.
• Such sewing machines are known from DE 103 49 127 A1 and DE 102011 118 813 B3.
• DE 1 002 189 A discloses a double machine working without Vorste cher with a curved eyelet and rectilinear workpiece feed.
• DE-PS 906403 discloses a sewing machine for sewing thick fabrics.
• DE 10040 807 A1 discloses a blind stitch sewing device.
• US 2017/0246837 A1 and US 2016/0052465 A1 disclose a method and a device for blind stitching a molded component.
• the bobbin thread reserve can be used as a bobbin case for be executed a bobbin thread.
• the sewing material support area is at least one surface section of the sewing machine, which specifies a relative position of the sewing material to be sewn to the seam-forming tools of the sewing machine. A spatial orientation of the sewing material to the sewing material support area is not important. It does not matter whether the material to be sewn rests on the support area or whether the support area rests on the material to be sewn from above.
• a course of the gripper rotation axis parallel to the sewing material support area simplifies the construction of the sewing machine.
• An arrangement of the sewing material support area to a movement path of the curved needle is such that the curved needle pierces the sewing material to be sewn from one sewing material side during the sewing movement along the movement path and exits again on the same sewing material side.
• Such an arrangement according to enables the sewing material to be sewn in the form of a single-sided double lockstitch.
• a secure butt edge mowing of two pieces of sewing material placed against one another is sufficient here.
• the entry / exit material side can face the gripper.
• the sewing machine can be designed as a hand sewing machine.
• a weight of the sewing machine can be less than 5 kg, can be less than 4.5 kg, can be less than 4 kg, can be less than 3.5 kg, can be less than 3 kg, can be less than 2.5 kg, can be less than 2 kg, can be less than 1.5 kg, can be less than 1 kg and can be even less.
• the hand sewing machine regularly has a weight that is greater than 200 g. Such a hand sewing machine is suitable for sewing bulky material or material that cannot be transported for other reasons.
• a parallel course of the needle pivot axis to the gripper rotation axis according to claim 2 leads to a simplification of a drive of the seam formation tools.
• An embodiment according to claim 4 enables the use of the sewing machine ne even with comparatively large material thicknesses.
• a belt drive according to claim 5 can be implemented in a compact manner.
• the belt drive which drives the bow needle and the hook at the same time, enables the sewing machine's seam-forming tools to be synchronized with little effort.
• a needle guide snut according to claim 6 enables safe guidance of the upper thread along the curved needle without the upper thread coming free of the curved needle undesirably.
• the helical shape of the guide groove can be such that the guide groove completes a quarter to a half turn around a curved needle longitudinal axis along the curved needle.
• a higher number of revolutions of the helical arrangement of the guide groove is also possible, in particular in the range between 0.25 and 2 revolutions.
• FIG. 1 is a schematic view of stitch formation and drive components of a sewing machine when butting edges sewing two adjacent pieces of sewing material; and FIG. 2 shows a view of FIG. 1 in a representation similar to FIG.
• the sewing machine 1 is overall designed as a hand sewing machine, so it is not permanently installed for stationary operation and can be held in the hand by an operator during the sewing process.
• the sewing machine 1 can in particular be performed without supply lines connected to an external supply unit.
• the two pieces 2, 3 of the material to be sewn 4 abut against one another via an abutting edge 5.
• the sewing machine 1 is designed for sewing sewing material 4 with a material thickness D greater than 8 mm.
• the material to be sewn 4 can have a material thickness, for example, in the range between 10 mm and 25 mm.
• Seam-forming tools 6 of sewing machine 1 include a needle 7 for guiding an upper thread 8 (see also FIG. 2) and a gripper 9.
• the needle 7 is designed as a curved needle.
• the curved needle 7 can be pivoted about a needle pivot axis 10.
• a distance A between the curved needle 7 and the needle pivot axis 10 is equal to a radius r of an arcuate course of the curved needle 7 around the needle pivot axis 10.
• a stitch plate 12 belongs to a sewing material support area 11, which specifies a position of the sewing material 4 relative to the seam-forming tools 6 during butt-edge sewing.
• the sewing material support area 11 is arranged in relation to a movement path 13 of the curved needle 7, which is indicated by dashed lines in FIG. Page 14, which points upwards in FIGS. 1 and 2, punctures and exits again on the same sewing material page 14.
• This entry / exit sewing material side 14 faces the gripper 9.
• the curved needle does not emerge from the sewing material 4.
• the looper 9 is rotatable about a looper rotation axis 15 and has a bobbin thread reserve in the form of a bobbin case 16.
• the throat plate 12 has a capsule stop 17 to prevent rotation of the bobbin case around the looper rotation axis 15.
• the gripper axis of rotation 15 runs parallel to the needle pivot axis 10. Both axes 10, 15 extend in FIGS. 1 and 2 horizontally and perpendicular to the plane of the drawing.
• the gripper axis of rotation 15 runs parallel to the sewing material support area 11.
• a Riemenan drive 18 is used with a drive motor 19, which can be an electric motor with a battery supply, and a belt 20.
• the belt 20 is via a drive shaft 21 of the drive motor 19 - drove and runs over a main shaft 22, a thread lever eccentric 23, a tensioning roller 24 and a gripper shaft which runs along the gripper axis of rotation 15.
• the main shaft 22 is articulated to a rocking lever 26, which in turn is articulated eccentrically via a Nadelan drive wheel 27 with a needle drive shaft 28.
• the needle drive wheel 27 is connected via a further belt 29 to a needle shaft which runs along the needle pivot axis 10.
• the shafts 21, 22 and 28 again run parallel to the needle pivot axis 10 and to the gripper axis of rotation 15.
• the belt drive with the belts 20, 29 is designed so that the gripper 9 revolves twice during one movement period of the curved needle 7.
• An oscillating drive of the curved needle 7 about the needle pivot axis 10, which is synchronized with the rotation of the gripper 9 about the gripper axis of rotation 15, is achieved via the rocker arm 26 and the wide Ren belt 29.
• the sewing machine 1 generates a double lockstitch in the sewing material 4 via the seam-forming tools 7, 9 and the belt drive 18 for mowing the edges and thus securely connecting the two pieces 2, 3 of the sewing material 4.
• the tensioning roller 24 is pretensioned against the belt 20 by a tension spring and ensures sufficient tension of the belt 20.
• the belt 29 can also have a tensioning roller, not shown in the drawing.
• the movement of the bow needle along the movement path 13 is guided via a frame guide 30 fixed to the frame.
• the bow needle 7 is connected to the needle shaft via a needle holder 31.
• a thread lever 32 of the sewing machine is driven via the thread lever eccentric 23.
• the thread lever 32 has a thread lever link 33.
• Fig. 2 additionally shows the upper thread guide components of the sewing machine 1.
• the upper thread 8 is supplied in the form of a thread roll 34 via an upper thread supply. From there, the upper thread 8 first runs over a Fa den biasing unit 35 and a thread deflection eye 36. From there, the upper thread 8 runs over a thread lever eye 37 and another thread deflection eye 38 to a guide groove 39 in a jacket wall the curved needle 7 is arranged helically. The curved needle 7 has an eye 40 at this free end.
• the seam-forming tools 6 and the upper thread guide components are, as far as possible, placed in a housing 43 of the sewing machine 1 (see FIG. 2).

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=74661383

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (22)

• 2020
  • 2020-02-21 DE DE102020202270.4A patent/DE102020202270A1/de active Pending
• 2021
  • 2021-02-12 EP EP21705934.4A patent/EP4107321B1/de active Active
  • 2021-02-12 CA CA3167494A patent/CA3167494A1/en active Pending
  • 2021-02-12 WO PCT/EP2021/053556 patent/WO2021165163A1/de active Application Filing
  • 2021-02-12 CN CN202180016195.7A patent/CN115552065A/zh active Pending
  • 2021-02-12 US US17/800,965 patent/US12054867B2/en active Active

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