TW201819706A - Upper thread cutter assembly, two-needle sewing machine and piped pocket sewing system - Google Patents

Abstract

An upper thread cutter assembly (9) for a two-needle sewing machine has a cutter installation (10) for cutting off at least two upper threads which are in each case assigned to the stitch-forming components of one of the two needles. A counter cutter installation (11) for cutting off the upper threads interacts with the cutter installation (10). The cutter installation (10) has two individual blades (12, 13) for each of the upper threads. A cutter spacing adjustment installation (20) serves for predefining a nominal spacing (A) between the individual blades (12, 13) transverse to a sewing direction (19). The predefined nominal spacing (A) is selectable from at least two cutter spacing values. This results in an upper thread cutter assembly which can be employed in a flexible manner for various sewing tasks of the two-needle sewing machine.

Description

   Upper thread cutting unit, two-needle sewing machine and piping bag sewing system   

The content of German patent application No. DE 2016 222 427.1 is hereby incorporated by reference.

The present invention relates to an upper thread cutting assembly for a two-needle sewing machine, a two-needle sewing machine having this type of upper thread cutting assembly, and a piped pocket sewing system having this type of two-needle sewing machine.

Documents DE 199 26 866 C1, DE 42 23 527 C1, and DE 198 45 624 C1, as well as references cited herein, show the thus configured beaded bag sewing system and double needle sewing machine. Document JP 07116376 A discloses a loop trimmer assembly for a two-needle sewing machine.

The object of the present invention is to improve a thread-cutting assembly of the type mentioned at the beginning so that the thread-cutting assembly can be used in a flexible manner for various sewing tasks of a two-needle sewing machine.

This object is achieved according to the invention by a thread-cutting assembly for a two-needle sewing machine, said thread-cutting assembly having a cutting device for cutting at least two upper threads, said upper threads being assigned to said two in each case A stitch forming part of one of the root needles; a counter cutting device for cutting the thread to interact with the cutting device, wherein the cutting device has two independent blades which are used in each case for the thread 1. The cutting interval adjusting device is used to preset a nominal interval between independent blades transverse to the sewing direction, wherein the preset nominal interval can be selected from at least two cutting interval values.

A cutting device capable of interacting with the paired cutting device is used to cut the needle thread or the upper thread of the sewing machine. The paired cutting device can be implemented in a fixed position or fixed to the frame. Due to the cutting interval adjusting device, the upper thread cutting assembly can be adapted to different needle intervals. In this case, it is no longer necessary to provide a dedicated thread cutting assembly for each specific needle interval value. It has been recognized herein that it is also possible to reliably cut the two blades when not using a single blade for the two winding lines, but in each case using one blade for each of the two winding lines. online. In addition to cutting the upper thread, the upper thread cutting assembly can also hold the upper thread, that is, especially capture and clamp the upper thread, so that the controlled guidance of the upper thread is achieved especially after the upper thread has been cut.

It is particularly flexible to set the interval between the minimum and maximum cutting interval values in a stepless manner by means of a cutting interval adjusting device.

For each of the on-line threads assigned to one of the stitch forming members in each case, two independent paired blades provided with a paired cutting device, when the two independent paired blades are also used in the on-line cutting assembly, In the area of the central plane extending between the two needles in the direction of the vertical center in the sewing direction, a channel is created between the independent blades, and the channel can be used as a space for other machine parts to move. Independently paired blades can also be implemented as adjustable in terms of their mutual spacing.

The two component supports having an independent blade and a counterpart blade in each case are adjusted via the component spacers' mutual spacing at the same time to achieve simultaneous adjustment of the independent blades and adjustment of the corresponding counterpart blades assigned to the independent blades.

The embodiment of the cutting interval adjusting device is implemented such that independent of the corresponding nominal interval being adjusted, the centering of the position of the independent blade is performed relative to a center plane extending in a vertical center between the two needles in the sewing direction, This is comfortable and does not require any additional centering of the upper wire cutting assembly after the interval adjustment has been performed. Such a self-centering cutting interval adjusting device can be employed especially in the case where the upper wire cutting assembly has two component supports and the component supports each have an independent blade and a counterpart blade. In the case of another configuration, such as when independent blades and associated counterpart blades are assigned to different component supports, centering of the independent blade positions is also alternatively feasible.

The obliquely extending slot-shaped openings in each case have an adjusting bolt extending through said slot-shaped openings, said adjusting bolt being displaceable for adjusting the cutting interval and mounted in a bolt carrier fixed to the frame, which leads to The implementation of the cutting interval adjustment has a slight mechanical complexity. Regarding the implementation of the slot-shaped openings in an obliquely mirrored manner, this results in a self-centering cutting interval adjustment device which can have a slight complexity in terms of construction.

The bolt carrier has an adjustment opening that guides the adjustment bolt to be displaced in the adjustment displacement direction, which allows a limited adjustment movement. The adjustment opening of the bolt carrier can be implemented as a vertically extending groove.

The bolt carrier is implemented with two bolt bearing portions, wherein the two slot-shaped openings are arranged between the two bolt bearing portions, which results in a stable cutting interval adjustment device.

The advantages of the two-needle sewing machine with an upper thread cutting assembly according to the present invention and the beaded bag sewing system with a two-needle sewing machine according to the present invention correspond to those already described above with reference to the upper thread cutting assembly according to the present invention.

1‧‧‧ upper arm

2‧‧‧ lower substrate

4‧‧‧ vertical needle bar guide

5‧‧‧ Needle bar

6, 7‧‧‧ needle

8‧‧‧ Needle plate

9‧‧‧on-line cutting assembly

10‧‧‧ cutting device

11‧‧‧ Paired cutting device

12, 13‧‧‧ independent blade

14, 15‧‧‧ paired blades

16‧‧‧Thread catch hook

17‧‧‧ Inflator

17a‧‧‧Guide

17b‧‧‧Guide sleeve

17c‧‧‧Independent blade holding element

17d‧‧‧Lifting piston

17e‧‧‧Horizontal Guide

18r, 18l‧‧‧part support

19‧‧‧ Sewing direction

19a‧‧‧Plywood

20‧‧‧ cutting interval adjustment device

21‧‧‧center plane

22r, 22l‧‧‧ opening plate

23r, 23l‧‧‧‧inclined slot opening

24‧‧‧Adjustment bolt

25‧‧‧ Fastening nut

26‧‧‧ Gasket

27‧‧‧bolt carrier

28‧‧‧ opening

29‧‧‧ Reorientation

30‧‧‧base mounting plate

31‧‧‧bolt bearing part

32‧‧‧ vertical extension groove

33‧‧‧Support plate

A _min ‧‧‧Minimum cutting interval value

A _max ‧‧‧Max cutting interval value

Exemplary embodiments of the present invention will be described in more detail below with the help of the drawings: FIG. 1 shows a side view of a two-needle sewing machine, wherein the sewing direction extends perpendicular to the drawing surface; FIG. 2 shows the direction II from FIG. 1 An end view of the sewing machine as seen; FIG. 3 shows an upper thread cutting assembly for a two-needle sewing machine according to FIG. 1 for cutting an upper thread guided by the two needles of the two-needle sewing machine, and the upper thread cutting assembly is shown Is in the initial position; Fig. 4 shows the upper wire cutting assembly according to Fig. 3, shown in a cutting position; Fig. 5 shows the upper wire cutting assembly according to Figs. 3 and 4, shown without a fixed blade and a clamping plate, in Initial position with maximum cutting interval; Figure 6 shows the upper thread cutting assembly according to Figures 3 and 4, shown without fixed blades and clamping plates, in the initial position and with a minimum cutting interval; and Figure 7 Exploded view of the components of the cutting interval adjusting device that set the nominal interval between the independent blades of the cutting device of the on-line cutting assembly.

The figure shows a two-needle sewing machine, which typically has an upper arm 1, a lower base plate 2 in the form of a housing, and a vertical support that connects the upper arm and the lower base plate. In the arm 1, a needle bar 5 is mounted in a conventional manner so as to be vertically displaceable in a vertical needle bar guide 4, which can usually be driven by a motor (not shown) via a crank (also not shown) And it is driven up and down by an arm shaft (also not shown). The needle bar 5 carries two needles 6, 7 at its lower end. The needle bar 5 can be implemented such that the interval between the two needles 6, 7 can be set in a variable manner in advance. A needle plate 8 assigned to the needles 6, 7 is arranged on the upper side of the base plate 2, and a clamp (also not shown) is arranged below said needle plate 8. For example, the upper thread cutting assembly 9 shown in its entirety in FIG. 3 is used to cut the upper thread or needle thread guided by the needles 6, 7 in each case.

Thus, the two upper threads to be cut by the upper thread cutting assembly 9 are assigned in each case to a stitch forming member (needle / clamp) of one of the two needles 6, 7.

The upper thread cutting assembly 9 for cutting the upper thread has a cutting device 10 and a paired cutting device 11 that interacts with the cutting device 10 for cutting the upper thread.

The mating cutting device 11 is implemented to be fixed to the frame.

The cutting device 10 has two independent blades 12, 13 each for each of the two upper threads to be cut. In order to cut the corresponding upper thread, the paired blades 14, 15 of the paired cutting device 11 are assigned to each of the independent blades 12, 13.

The two independent blades 12, 13 of the cutting device 10 in each case have a thread catching hook 16 for capturing the respective upper thread and transferring the upper thread to a defined cutting position. When the wire is cut, the corresponding upper thread is cut off between the leading cutting edge of the corresponding mating blades 14, 15 and the mating trimming edge of the corresponding thread catching hook portion 16 of the independent blades 12, 13. Here, the individual blades 12, 13 of the cutting device 10 are repositioned between the initial position shown in FIG. 3 and the cutting position shown in FIG. 4.

This repositioning of the individual blades 12, 13 between the initial position and the cutting position is driven via a drive unit in the form of an air cylinder 17. This repositioning movement is guided via a guide rod 17a fixed to the frame, in each case a part of an independent blade holding element 17c and a guide sleeve 17b fixedly connected to the two independent blades, at the guide rod 17a Running. The lifting piston 17d of the gas cylinder 17 is in each case connected via a horizontally running guide rod 17e to the respective independent blade holding element 17c so as to be fixed in terms of thrust and pull.

The common part support 18r supports the vertical guide bar 17a of the independent blade 12 for the cutting device 10 on the right side in FIG. 3 and the assigned counterpart blade 14 of the counterpart cutting device 11 on the right side. Accordingly, the other component support 18l supports the vertical guide bar 17a shown as the independent blade 13 for the cutting device 10 on the left in FIG. 3 and the associated counterpart blade 15 on the left.

Each of the independent blades 12, 13 is assigned a clamping plate 19a. The respective clamping plate 19a is attached to the individual blade holding element 17c, which in turn holds this individual blade 12,13. When the respective clamping plates 19a are biased, they are carried on the assigned individual blades 12, 13 on the side facing away from the assigned counterpart blades 14,15.

When cutting, that is, when the independent blades 12, 13 are transferred from the initial position to the cutting position, the corresponding upper thread is simultaneously clamped between the allocated independent blades 12, 13 and the clamping plate 19a, and the clamping plate is then assigned to this Independent blades 12,13. This clamping action is maintained as long as the individual blades 12, 13 are still in the cutting position.

The nominal interval A between the independent blades 12, 13 and the counterpart blades 14, 15 is set in advance via a cutting interval adjustment device 20 to be described later, the nominal interval A being transverse to the sewing direction 19 perpendicular to the drawing according to FIG. Here, the nominal interval A between the minimum cutting interval value A _min and the maximum cutting interval value A _max can be preset in a stepless manner via the cutting interval device 20. FIG. 5 shows a cutting device 10 having a maximum cutting interval value A _max . FIG. 6 shows a cutting device 10 having a minimum cutting interval value A _min . Therefore, a preset nominal interval A can be selected from a plurality of cutting interval values. In the case of such a cutting interval adjustment, the horizontal movement of the independent blade holding member 17c is guided by the horizontal guide rod 17e via a horizontal guide sleeve provided therein.

The cutting interval adjusting device 20 is implemented so that the interval between the two component supports 18r, 18l can be set in advance. The cutting interval adjusting device 20 is implemented such that, independently of the corresponding nominal interval A being adjusted, the centering of the positions of the independent blades 12, 13 and the positions of the paired blades 14, 15 is performed relative to the center plane 21, with the center plane at the two The needles 6 and 7 extend in a vertical center along the sewing direction 19. (See Figure 1).

Details of such a cutting interval adjustment will be described below with reference to FIG. 7.

Each of the component supports 18r, 18l has an opening plate 22r, 22l, which in each case has a slot-shaped opening 23r, 23l extending obliquely. An adjustment bolt 24 extends through the two slot-shaped openings 23r, 23l. The adjustment bolt is displaceable for adjusting the cutting interval and is fastened via a fastening nut 25 having a washer 26. The bolt carrier 27 for the adjustment bolt 24 fixed to the frame includes an adjustment opening 28 that guides the repositioning of the adjustment bolt 24 in the vertical adjustment repositioning direction 29 in FIGS. 2 and 3. The adjustment opening 28 is implemented as a vertically extending groove in the base mounting plate 30 of the module 9. The drive unit 17 is also attached to the base mounting plate 30. The base mounting plate 30 is then fixed to the frame. In addition to the base mounting plate 30 representing the first bolt bearing portion, another bolt bearing portion 31 forms a part of the bolt bearing member 27. The further bolt-carrying portion 31 in turn has a vertically extending groove 32 implemented in alignment with the vertical groove of the adjustment opening 28. When viewed in the sewing direction 19, the two opening plates 22r, 22l with associated inclined groove-shaped openings 23r, 23l are arranged between the two bolt-carrying portions 30, 31. The adjustment bolt 24 passes through the adjustment opening 28 of the base mounting plate 30, the inclined groove-shaped opening 23l of the opening plate 22l, the inclined groove-shaped opening 23r of the opening plate 22r, and the groove 32 of the other bolt bearing portion 31 along the way.

With the cutting interval adjusting device 20, the interval between the two component supports 18r and 18l, and thus the interval between the blades 12, 13 of the cutting device 10 and the paired blades 14, 15 of the paired cutting device 11, is adjusted as follows: First, the nominal distance A between the two needles 6, 7 is set in advance according to the respective sewing tasks. The fastening nut 25 is subsequently loosened and the adjustment bolt 24 is repositioned in the adjustment repositioning direction 29. Due to the effect of the forces exerted on the two opening plates 22r, 22l and the associated component supports 18r, 18l by the adjusting bolts 24 via the inclined groove-shaped openings 23r, 23l, this results in the two component supports 18r, 18r, Repositioning of 18l relative to each other and corresponding modification of the nominal spacing A between the blades 12, 13, or 14, 15. This repositioning of the adjustment bolt 24 in the adjustment repositioning direction 29 is performed until the desired nominal interval A is reached. Then tighten the fastening nut 25 again. The inclined slot-shaped openings 23r, 23l ensure that the nominal interval A is set in advance in a stepless manner.

The double-needle sewing machine is part of the piping bag sewing system.

The needle plate 8 is aligned with a support plate 33 for an article to be sewn. The article to be sewn is, for example, a first article to be sewn, the first article to be sewn is, for example, a front panel of a jacket, and the first article to be sewn is placed on the support plate 33. A second article to be sewn, such as a piping tape, is placed on the first article to be sewn. Then, a third article to be sewn, such as a patch, is placed on one side of the second article to be sewn. These three items to be sewn are sewn together by means of a double-needle sewing machine, and are cut through simultaneously in order to form a gap (not shown).

Claims (10)

    A thread cutting assembly for a two-needle sewing machine,-having a cutting device for cutting at least two threads, said thread in each case being assigned to a stitch forming part of one of the two needles,-having A paired cutting device that cuts the upper thread and interacts with the cutting device, where the cutting device has two independent blades, which in each case are used for one of the upper lines, with a cutting interval adjustment device for presetting The nominal interval between the independent blades transverse to the sewing direction, wherein the preset nominal interval can be selected from at least two cutting interval values.         The component according to claim 1, wherein the cutting interval adjusting means is implemented to preset a nominal interval between the minimum and maximum cutting interval values in a stepless manner.         The assembly according to claim 1, wherein the paired cutting device has two independent paired blades for each of the windings assigned to one of the stitch forming members in each case.         The assembly according to claim 1, comprising two component supports, which in each case have a separate blade and a counterpart blade.         The assembly according to claim 1, wherein the cutting interval adjusting means is implemented such that, independently of the corresponding nominal interval being adjusted, the centering of the independent blade position is centered vertically with respect to the sewing direction between the two needles The way the center plane extends is performed.         The assembly according to claim 4, wherein each of the component supports has a slot-shaped opening extending obliquely, and an adjustable bolt which is displaceable for adjusting the cutting interval extends through the slot-shaped opening, and the adjusting bolt is installed In a bolt carrier fixed to the frame.         The assembly according to claim 6, wherein the bolt carrier has an adjustment opening that guides the displacement of the adjustment bolt in the adjustment displacement direction.         The assembly according to claim 6, wherein the bolt carrier is implemented with two bolt bearing portions, wherein the two slot-shaped openings are arranged between the two bolt bearing portions.         A two-needle sewing machine having the upper thread cutting assembly according to claim 1.         A beaded bag sewing system having the double needle sewing machine according to claim 9.