TWI742196B - 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 assembly, double needle sewing machine and piping bag sewing system

The content of German Patent Application No. DE 2016 222 427.1 is incorporated herein by reference.

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

From the document DE 199 26 866 C1, the document DE 42 23 527 C1, and the document DE 198 45 624 C1, as well as the references stated here, the piping bag sewing system and the two-needle sewing machine configured in this way are known. The document JP 07116376 A discloses a knot loop thread trimmer assembly for a two-needle sewing machine.

The purpose of the present invention is to improve the upper thread cutting assembly of the type mentioned at the beginning, so that the upper thread cutting assembly can be applied to various sewing tasks of a double-needle sewing machine in a flexible manner.

According to the present invention, through the upper thread cutting for the double-needle sewing machine This is achieved by a cutting assembly, said upper thread cutting assembly having: a cutting device for cutting at least two upper threads, said upper thread being assigned to the stitch forming part of one of said two needles in each case; A counter cutting device that cuts the upper thread and the cutting device interacts, wherein the cutting device has two independent blades, the independent blades are used for one of the upper threads in each case; the cutting interval adjustment device is used for preset 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 cutting device that can interact with the matching cutting device is used to cut the needle thread or upper thread of the sewing machine. The mating cutting device can be implemented as being installed on the frame or fixed to the frame without changing its position. Due to the cutting interval adjustment 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 upper thread cutting assembly for each specific needle interval value. It has been recognized in this article that when a single blade is not used for the two upper threads, but in each case one blade is used for each of the two upper threads, the two upper threads can also be cut reliably. online. In addition to cutting the upper thread, the upper thread cutting assembly is also capable of capturing the upper thread, that is to say in particular capturing and clamping the upper thread, so that, after the upper thread has been cut, a controlled guidance of the upper thread is achieved in particular.

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

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

The adjustment of the mutual spacing of the two component supports with one independent blade and one counterpart blade in each case enables 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, independently of the corresponding nominal interval being adjusted, the centering of the independent blade position is performed with respect 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. Especially when the upper wire cutting assembly has two component supports, and the component supports have an independent blade and a mating blade in each case, such a self-centering cutting interval adjusting device can be used. In the case of another configuration such as when independent blades and associated counterpart blades are allocated to different component supports, centering of the independent blade positions is also alternatively feasible.

The obliquely extending slot-shaped opening has in each case an adjustment bolt extending through the slot-shaped opening, which can be displaced in order to adjust the cutting interval and is installed in a bolt carrier fixed to the frame, which results in The implementation of cutting interval adjustment has slight mechanical complexity. Regarding the slot-shaped opening being implemented to extend in an oblique mirror image manner, this causes the self-centering cutting interval adjustment device to have a slight complexity in terms of construction.

The bolt carrier has an adjustment opening that guides the displacement of the adjustment bolt in the adjustment displacement direction, which allows a defined 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 carrying parts, wherein the two slot-shaped openings are arranged between the two bolt carrying parts, which results in a stable cutting interval adjustment device.

The advantages of the double needle sewing machine with the upper thread cutting assembly according to the present invention and the piping bag sewing system with the double 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 components

10: Cutting device

11: Pairing cutting device

12, 13: Independent blade

14, 15: matched blade

16: thread catching hook

17: Air pump/drive unit

17a: guide rod

17b: Boot sleeve

17c: Independent blade holding element

17d: Lifting piston

17e: Horizontal guide bar

18r, 18l: component support

19: Sewing direction

19a: Clamping board

20: Cutting interval adjustment device

21: Center plane

22r, 22l: opening plate

23r, 23l: inclined slot opening

24: adjusting bolt

25: Fasten the nut

26: Gasket

27: Bolt Carrier

28: opening

29: Repositioning the direction

30: Base mounting plate

31: Bolt bearing part

32: Vertical extension slot

33: Support plate

A _min : minimum cutting interval value

A _max : Maximum cutting interval value

Hereinafter, an exemplary embodiment of the present invention will be described in more detail with the aid of the accompanying drawings: Figure 1 shows a side view of a two-needle sewing machine, in which the sewing direction extends perpendicular to the plane of the drawing; Figure 2 shows from the direction II in Figure 1 See the end side view of the sewing machine; Figure 3 shows the upper thread cutting assembly for the double-needle sewing machine according to Figure 1, for cutting the upper thread guided by the two needles of the double-needle sewing machine, the upper thread cutting assembly is shown Fig. 4 shows the upper wire cutting assembly according to Fig. 3, shown in the cutting position; Fig. 5 shows the upper wire cutting assembly according to Figs. 3 and 4, shown without a fixed blade and wire clamping plate, in The initial position and the maximum cutting interval; Figure 6 shows the upper wire cutting assembly according to Figures 3 and 4, shown as no solid The fixed blade and the wire clamping plate are in the initial position and have the minimum cutting interval; and FIG. 7 shows an exploded view of the parts of the cutting interval adjusting device for pre-setting the nominal interval between the independent blades of the cutting device of the upper wire cutting assembly.

In the figure, a double needle sewing machine is shown, which usually has an upper arm 1, a lower base plate 2 in the form of a housing, and a vertical support connecting the upper arm and the lower base plate. In the arm 1, the needle bar 5 is mounted in a conventional manner so as to be able to be displaced vertically in the vertical needle bar guide 4, the needle bar generally being able to pass through a crank (also not shown) by means of a motor (not shown) And it is driven by an arm shaft (also not shown) in an up and down reciprocating manner. 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 preset in a variable manner. A needle plate 8 allocated to the needles 6 and 7 is arranged on the upper side of the base plate 2 and a clamp (also not shown) is arranged under the 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.

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

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

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

The cutting device 10 has two independent blades 12, 13, each of which is used 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 allocated to each of the independent blades 12, 13.

The two independent blades 12, 13 of the cutting device 10 have in each case a thread catching hook 16 for capturing the corresponding upper thread and transferring the upper thread to a defined cutting position. When the thread is cut, the corresponding upper thread is cut between the leading cutting edge of the corresponding mating blade 14, 15 and the mating trimming edge of the corresponding thread catching hook 16 of the independent blade 12, 13. Here, the independent 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 independent 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 part of an independent blade holding element 17c and fixedly connected to the guide sleeve 17b of the two independent blades at the guide rod 17a Run in. The lifting piston 17d of the gas cylinder 17 is in each case connected to the corresponding independent blade holding element 17c via a horizontally running guide rod 17e so as to be fixed in terms of thrust and tension.

The common component support 18r supports the vertical guide bar 17a for the independent blade 12 of the cutting device 10 on the right in FIG. 3 and the allocated counterpart blade 14 of the counterpart cutting device 11 on the right. Accordingly, the other component support 181 supports the vertical guide bar 17a shown as the independent blade 13 of the cutting device 10 on the left in FIG. 3 and the associated counterpart blade on the left 15.

Each of the independent blades 12, 13 is assigned a wire clamping plate 19a. The corresponding clamping plate 19a is attached to the independent blade holding element 17c, which in turn holds this independent blade 12, 13. When the corresponding clamping plate 19a is biased, it is carried on the allocated independent blades 12, 13 on the side facing away from the allocated 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 assigned independent blades 12, 13 and the thread clamping plate 19a, and the thread clamping plate is then allocated to this Independent blades 12, 13. As long as the independent blades 12, 13 are still in the cutting position, this clamping action is maintained.

The nominal interval A between the independent blades 12, 13 and the counterpart blades 14, 15 is preset via a cutting interval adjusting device 20 described below, and the nominal interval A is transverse to the sewing direction 19 perpendicular to the plane of the drawing according to FIG. 1. 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, the preset nominal interval A can be selected from a plurality of cutting interval values. In the case of this cutting interval adjustment, the horizontal movement of the independent blade holding member 17c is guided by the horizontal guide rod 17e via the horizontal guide sleeve provided therein.

The cutting interval adjusting device 20 is implemented so that the interval between the two component supports 18r, 181 can be preset. Cutting room The spacer adjustment device 20 is implemented so that the centering of the positions of the independent blades 12, 13 and the positions of the counterpart blades 14, 15 is performed independently of the corresponding nominal interval A to be adjusted relative to the center plane 21, which is in the two needles. The space between 6 and 7 extends along the sewing direction 19 in a vertical center. (See Figure 1).

The details of this 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, and the opening plate has an obliquely extending slot-shaped opening 23r, 23l in each case. The adjusting bolt 24 extends through the two groove-shaped openings 23r, 23l, and the adjusting bolt is displaceable in order to adjust the cutting interval and is fastened via a fastening nut 25 with 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 slot in the base mounting plate 30 of the assembly 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 part, yet another bolt bearing part 31 forms a part of the bolt bearing 27. The other bolt bearing portion 31 in turn has a vertically extending groove 32 implemented to be aligned 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 slot-shaped openings 23r, 23l are arranged between the two bolt bearing portions 30, 31. The adjusting bolt 24 passes through the adjusting opening 28 of the base mounting plate 30, the inclined slot-shaped opening 23l of the opening plate 22l, the inclined slot-shaped opening 23r of the opening plate 22r, and the slot 32 of the other bolt bearing portion 31 along the road.

Using the cutting interval adjustment device 20, the interval between the two component supports 18r and 181, and therefore the interval between the blades 12, 13 of the cutting device 10 and the counterpart blades 14, 15 of the counterpart cutting device 11, is adjusted as follows: First, the nominal mutual distance A of the two needles 6 and 7 is preset according to the corresponding sewing task. The fastening nut 25 is then loosened, and the adjustment bolt 24 is repositioned in the adjustment repositioning direction 29. Due to the effect of the force exerted on the two opening plates 22r, 22l and the associated component supports 18r, 18l via the inclined slot-shaped openings 23r, 23l by the adjustment bolt 24, this results in the two component supports 18r, 18r, respectively. The repositioning of the 181 relative to each other and the 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 preset in a stepless manner.

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

The needle plate 8 is aligned with the support plate 33 for the article to be sewn. The article to be sewn is, for example, the first article to be sewn, the first article to be sewn is, for example, the 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. The three items to be sewn are sewn together by means of a double-needle sewing machine, and are cut through at the same time in order to form a gap (not shown).

1‧‧‧Upper arm

4‧‧‧Vertical needle bar guide

5‧‧‧Needle bar

7‧‧‧Needle

12‧‧‧Independent blade

14‧‧‧Matching blade

17‧‧‧Air cylinder

19a‧‧‧Thread clamping plate

24‧‧‧Adjusting bolt

25‧‧‧Fastening nut

26‧‧‧Gasket

Claims (8)

A double-needle sewing machine having an upper thread cutting assembly having a cutting device for cutting at least two upper threads, the upper thread being assigned to the stitch forming part of one of the two needles in each case , Having a paired cutting device for cutting the upper thread interacting with the cutting device, wherein the cutting device has two independent blades, the independent blade being used in each case for one of the upper threads, with A cutting interval adjusting device is used to preset a 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, wherein the cutting interval adjusting device implements In order to be independent of the adjusted corresponding nominal spacing, the centering of the independent blade position is performed relative to a center plane extending in a vertical center between the two needles along the sewing direction, wherein the The upper thread cutting assembly is installed to the upper arm of the double-needle sewing machine. The double-needle sewing machine according to claim 1, wherein the cutting interval adjusting device is implemented to preset a nominal interval between the minimum and maximum cutting interval values in a stepless manner. The double-needle sewing machine according to claim 1 or 2, wherein the paired cutting device has two independent paired blades, and the independent The mating blade is used for each upper thread assigned to one of the stitch forming members in each case. The double-needle sewing machine according to claim 1 or 2, further comprising two component supports, the component supports having an independent blade and a mating blade in each case. The double-needle sewing machine according to claim 4, wherein each of the component supports has a slot-shaped opening extending obliquely, an adjustment bolt passes through the slot-shaped opening, and the adjustment bolt is movable for adjusting the cutting interval The adjusting bolt is installed in a bolt carrier fixed to the frame. The double-needle sewing machine according to claim 5, wherein the bolt carrier has an adjustment opening that guides the displacement of the adjustment bolt in the adjustment displacement direction. The double-needle sewing machine according to claim 5, wherein the bolt bearing member is implemented to have two bolt bearing parts, wherein the two slot-shaped openings are arranged between the two bolt bearing parts. A piping bag sewing system, which has the double-needle sewing machine according to any one of claims 1 to 7.

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