CN103635621A

CN103635621A - Thread cutting device for a sewing machine

Info

Publication number: CN103635621A
Application number: CN201280030767.8A
Authority: CN
Inventors: 吴荣坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-22
Filing date: 2012-05-29
Publication date: 2014-03-12
Also published as: WO2012176992A2; WO2012176992A3; KR101276273B1; WO2012176992A9; KR20130000106A

Abstract

The present invention relates to a thread cutting device for a sewing machine. The thread cutting device may adjust the state of a thread in a knife assembly since it is difficult to adjust the state of the thread through a sewing machine body. A cutting part having first and second protrusions and cut-out grooves may be formed on a knife of the knife assembly so as to reduce wasting of thread since thread remaining after sewing is cut to a short length when compared to that in a thread cutting device according to a related art. Further, the thread may be prevented from being tangled so as to improve work efficiency. The thread cutting device of the sewing machine according to the present invention consists essentially of: a sewing machine body (20); and a knife assembly (30) installed under the sewing machine body and having a knife (70) for cutting the thread after sewing. The knife assembly (30) consists essentially of: a hook body (40) mounted on a driving shaft (42); a bobbin case (50) received in the hook body (40); a bobbin (60) arranged within the bobbin case (50) so as to allow thread to be wound therearound; and the knife (70) disposed on the hook body (40) in order to cut the thread. The knife (70) has a curvature corresponding to an outer circumference of the bobbin case (50). Further, the knife has one side in which a coupling groove (72) is formed for coupling to the bobbin case (50) and the other side on which a cutting part (74) is formed for cutting the thread.

Description

The thread cutting device of Sewing machines

Technical field

The present invention relates to a kind of thread cutting device of Sewing machines, more specifically, the thread cutting device that relates to a kind of Sewing machines, limited owing to adjusting line states by sewing machine main body, therefore, the present invention adjusts line states at cutter assembly, now, at the cutting knife of cutter assembly, form the cutting portion with the first protuberance, the second protuberance and grooving, thereby, after sewing up, cut off and remaining line length is shorter, when sewing up next time, can save than in the past line, can also mutually be wound around by anti-principal vertical line, and finally can increase work efficiency and product quality.

Background technology

Generally, Sewing machines is to penetrate the state through and through suture object of needlework (upper thread) at Sewing machines pin hole.In object bottom surface, have bottom line, two lines that intersect while running through are sewed up.Needlework through above time, move to next suture by stitching object, and then thread a needle again.With machinery, carry out described action continuously and sew up object.

But as shown in Figure 1, when Sewing machines 100 carries out after stitching work tangent line, due to cutting knife 110 bracing wires and exert pressure and carry out tangent line, therefore, remaining line is longer.When keeping residual fraction and proceeding to sew up, because line end part is along with moving down of pin enters the downside of sewing fabric, therefore, in the process of sewing up, line is wound around mutually, and line end is wrapped in "the" shape linear slit, and has the problem of the bad linear slit of the generation quality of so-called bird's nest.

Summary of the invention

The present invention proposes for solving existing issue point, its object is, a kind of thread cutting device of novel sewing machine is provided, limited owing to adjusting line states by sewing machine main body, therefore, the present invention adjusts line states at cutter assembly, now, at the cutting knife of cutter assembly, form the cutting portion with the first protuberance, the second protuberance and grooving, thereby, after sewing up, cut off and remaining line length is shorter, when sewing up next time, can save than in the past line, can also mutually be wound around by anti-principal vertical line, and finally can increase work efficiency.

For reaching described object, the invention provides the thread cutting device of Sewing machines, wherein, comprising: sewing machine main body 20; Cutter assembly 30, is arranged at the downside of described sewing machine main body 20, and possesses after stitching for the cutting knife 70 of tangent line, and described cutter assembly 30, comprising: rotating shuttle body 40, is installed on driving shaft 42; Shuttle casket 50, is contained in described rotating shuttle body 40; Roll 60, is arranged in described shuttle casket 50, for spiral; Cutting knife 70, is arranged at described rotating shuttle body 40, for tangent line.

According to the thread cutting device of Sewing machines of the present invention, wherein, described cutting knife 70 is incorporated into the axle sleeve of the driving shaft 42 of described rotating shuttle body 40, described cutting knife, in a side, be formed with combined hole 72 to be incorporated into the axle sleeve of the driving shaft 42 of described rotating shuttle body 40, at opposite side, be formed with the cutting portion 74 for tangent line.

According to the thread cutting device of Sewing machines of the present invention, wherein, in the cutting portion 74 of described cutting knife 70, be formed with: the first protuberance 742, the outstanding end that is formed at cutting portion 74; The second protuberance 744, inwards separates formation from described the first protuberance 742; And stepped grooving 746, for line is being separated between described first protuberance 742 and the second protuberance 744 of formation.

Invention effect

As mentioned above, according to the thread cutting device of Sewing machines of the present invention, there is following effect, limited owing to adjusting line states by sewing machine main body, therefore, the present invention adjusts line states at cutter assembly, now, cutting knife at cutter assembly forms the cutting portion with the first protuberance, the second protuberance and grooving, thereby, after sewing up, cut off and remaining line length is shorter, when sewing up next time, can save than in the past line, can also mutually be wound around by anti-principal vertical line, finally can increase work efficiency and product quality.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that existing Sewing machines is sewed up back guy state.

Fig. 2 is for the figure of the thread cutting device of Sewing machines is according to a preferred embodiment of the invention described.

Fig. 3 is the exploded perspective view of the cutter assembly in the thread cutting device of Sewing machines according to a preferred embodiment of the invention.

Fig. 4 is for the figure of the cutting knife of cutter assembly is described in the thread cutting device of Sewing machines according to a preferred embodiment of the invention.

Fig. 5 sews up the figure of back guy state at the thread cutting device of Sewing machines according to a preferred embodiment of the invention.

The specific embodiment

Below, according to Fig. 2 to Fig. 5, describe the preferred embodiments of the present invention in detail, in Fig. 2 to Fig. 5, to thering is the inscape of identical function, mark identical symbol.At accompanying drawing and in describing in detail, omit not having the concrete technology of the key element of direct relation to form with technical characterictic of the present invention and the explanation of effect, and omit and illustrate, at this, only schematic representations illustrates that technology related to the present invention forms.

With reference to Fig. 2 to Fig. 5, the thread cutting device 10 of Sewing machines according to a preferred embodiment of the invention possesses sewing machine main body 20 and cutter assembly 30.

Sewing machine main body 20 possesses while stitching for adjusting the nut 22 of the state of product and line, and lower nuts 222 is for adjusting the nut of the quality state of the portion of making, and upper nut 224 is to adjust the nut of the line states of needle point.

Cutter assembly 30 comprises: rotating shuttle body 40, is installed on driving shaft 42; Shuttle casket 50, is contained in rotating shuttle body 40; Roll 60, is arranged in shuttle casket 50, for coiling; Cutting knife 70, is arranged at the axle sleeve (omit diagram) of the driving shaft 42 of rotating shuttle body 40, and for tangent line.

With reference to Fig. 2 explanation have as described in the cutter assembly 30 of formation, this cutter assembly comprises: rotating shuttle body 40, be installed on the driving shaft 42 that is rotatably connected in power set, be called again outer shuttle; Shuttle casket 50, is contained in rotating shuttle body 40; Winding reel 60, for the bottom line of reeling, shuttle casket 50 comprises: shuttle casket base plate 52, be contained in rotating shuttle body 40, be called again interior shuttle; Shuttle casket main body 54, holds winding reel in the outside of winding reel 60.

Vertically in the bottom surface of shuttle casket base plate 52 be provided with double-screw bolt 522, at described double-screw bolt 522, be rotatably provided with winding reel 60, in shuttle casket main body 54, be formed with bobbin case latch 542, so that coupling or dismounting fixing winding reel while being formed at the double-screw bolt 522 of shuttle casket base plate 52.

Illustrate that the action of described cutter assembly 30 is for as follows.By the rotation of driving shaft 42, rotating shuttle body 40 is rotated, and reaches the standard grade and form the ring of coiling shuttle casket 50 on hook, and from roll 60 solutions are left, the bottom line out of the floss hole by shuttle casket main body 54 is hung in ring and pulls on simultaneously, thereby carries out stitching work.Then, after finishing stitching work, the cutting knife 70 that is arranged at the driving shaft 42 of rotating shuttle body 40 carries out tangent line.

In addition, at cutter assembly 30, be arranged at the cutting knife 70 of axle sleeve of the driving shaft 42 of rotating shuttle body 40, in a side, be formed with combined hole 72 to be incorporated into shuttle casket 50, at opposite side, be formed with the cutting portion 74 for tangent line.Now, in described cutting portion 74, be formed with: the first protuberance 742, outstanding formation the in the end of cutting portion 74; The second protuberance 744, inwards separates formation from described the first protuberance 742; And stepped grooving 746, for line is being separated between described first protuberance 742 and the second protuberance 744 of formation.

Grooving 746, side is formed with end difference 7462 from upside to downside within it, forms porosely 7464 in the end of end difference 7462, and the side that faces up on hole 7464 is formed with protuberance 7466.

As shown in Figure 5, its Length Ratio of the line being pulled off by cutting knife is shorter, therefore, when sewing up next time, can save than in the past line, and can be wound around mutually by effectively anti-principal vertical line.

So, line is positioned at the grooving 746 of the cutting knife 70 that is formed on cutter assembly 30 and is cut off, and grooving 746 is darker, the phenomenon of can natural tangent line during tangent line and not drawn, therefore, after stitching work, the line length of staying needle point is shorter, and while carrying out next stitching work, can effectively carry out stitching work.

As mentioned above, the thread cutting device of Sewing machines according to a preferred embodiment of the invention, limited owing to adjusting line states by sewing machine main body, therefore, the present invention adjusts line states at cutter assembly, now, has the cutting portion of the first protuberance, the second protuberance and grooving in the cutting knife formation of cutter assembly, thereby, after sewing up, cut off and remaining line length is shorter, when sewing up next time, can save than in the past line, can also mutually be wound around by anti-principal vertical line, finally can increase work efficiency and product quality.

Above, though the thread cutting device of Sewing machines has according to a preferred embodiment of the invention been described by embodiment and accompanying drawing, but, these only illustrate, and those skilled in the art in the invention are appreciated that within the scope of technological thought of the present invention can carry out various variations and change.

Work utilizes possibility

The present invention relates to a kind of thread cutting device of Sewing machines, more specifically, the present invention can be used in the thread cutting device field of Sewing machines, limited owing to adjusting line states by sewing machine main body, therefore, the present invention adjusts line states at cutter assembly, now, at the cutting knife of cutter assembly, form the cutting portion with the first protuberance, the second protuberance and grooving, thereby, after sewing up, cut off and remaining line length is shorter, when sewing up next time, can save than in the past line, can also mutually be wound around by anti-principal vertical line, and finally can increase work efficiency and product quality.

Claims

1. a thread cutting device for Sewing machines, is characterized in that, comprising:

Sewing machine main body (20);

Cutter assembly (30), is arranged at the downside of described sewing machine main body (20), and possesses after stitching the cutting knife (70) for tangent line,

Described cutter assembly (30), comprising:

Rotating shuttle body (40), is installed on driving shaft (42);

Shuttle casket (50), is contained in described rotating shuttle body (40);

Roll (60), is arranged in described shuttle casket (50), for spiral;

Cutting knife (70), is arranged at described rotating shuttle body (40), for tangent line.

2. the thread cutting device of Sewing machines according to claim 1, it is characterized in that, described cutting knife (70) is incorporated into the axle sleeve of the driving shaft (42) of described rotating shuttle body (40), described cutting knife, in a side, be formed with combined hole (72) to be incorporated into the axle sleeve of the driving shaft (42) of described rotating shuttle body (40), at opposite side, be formed with the cutting portion (74) for tangent line.

3. the thread cutting device of Sewing machines according to claim 2, is characterized in that, the cutting portion (74) in described cutting knife (70) is formed with: the first protuberance (742), the outstanding end of cutting described disconnected portion (74) that is formed at; The second protuberance (744), inwards separates formation from described the first protuberance (742); And stepped grooving (746), for being positioned at, line separates between described first protuberance (742) and the second protuberance (744) of formation.