KR100740523B1 - Under thread supply device of sewing machine - Google Patents

Abstract

An under thread supply device of a sewing machine is provided to supply directly the under thread from an under thread cone, thereby performing a sewing work continuously. An outside winder(150) is rotated by a hollow type driving shaft(110) and has a winder tip. An inside winder(170) is rotatably combined with the outside winder. A bobbin cap(190) is fixedly installed at the inside winder and fixed by a winder guide. A penetration hole is formed at the center of the outside winder so that an under thread passing through the hollow type driving shaft is penetrated. A guide hole is penetrated from the left side to the right side of the winder tip so that the under thread is penetrated. A tension control member is equipped to the guide hole and controls the tension passing through the guide hole. A guide tube(130) is equipped into the hollow type driving shaft and the penetration hole of the outside winder.

Description

Lower thread feeder of sewing machine {UNDER THREAD SUPPLY DEVICE OF SEWING MACHINE}

1 is a perspective view schematically showing a bobbin supply device of a sewing machine according to an embodiment of the present invention,

Figure 2 is an exploded perspective view schematically showing the separation of the outer kiln, inner kiln and bobbin cap,

3 is a cross-sectional view schematically showing a cross-sectional state along the line A-A of FIG.

4 is a cross-sectional view schematically showing a cross section of a state in which the outer kiln is mounted on the drive shaft and the guide tube.

5 is a partial perspective view schematically illustrating an enlarged state in which a tension adjusting member is mounted on a hook;

6 is a cross-sectional view schematically illustrating a cross-sectional state along the line B-B in FIG. 5.

FIG. 7 is a view showing a state immediately before the hook of the rotating outer hook hangs the needle thread loop which descends together with the needle;

8 to 12 are views sequentially showing the step of forming the bark according to the rotation of the outer kiln.

*** Explanation of symbols for main parts of drawing ***

10: lower thread supply device 110: drive shaft

130: guide tube 150: kiln

152: kiln 153: guide ball

154: through hole 170: inner kiln

190: bobbin cap 210: tension control member

212: screw 214: tension control plate

910: bobbin thread 930: needle thread

970: fabric

The present invention relates to a lower thread supply device of the sewing machine that can be continuously sewing by supplying the lower thread directly from the lower thread cone installed on the work table during the sewing operation, and in detail rotated by a hollow drive shaft and hook The outer kiln is formed, the inner kiln is rotatably coupled to the outer kiln, comprising a bobbin cap fixed to the inner kiln and fixed by the kiln, the hollow drive shaft in the center of the outer kiln It relates to a lower thread supply device for a sewing machine characterized in that the through-hole is formed through which the lower thread passing through is formed, the guide hole penetrates to the right and left side of the hook and the lower thread drawn out through the through-hole.

In general, a widely used sewing machine includes a needle thread supply device which is installed on an upper part of a work table and moves up and down a needle into which a needle thread is inserted, and a lower thread supply device installed in a lower part of the work table so as to be linked with the needle thread supply device. Is done.

Among these, the lower thread supply device includes a drive shaft that is rotated by a power unit, a hook that is attached to the drive shaft and hangs a needle thread loop formed by the needle, and a thread in which the stud is rotated and fixed in the outer hook. A kiln, a bobbin axially coupled to the stud of the inner kiln and the bobbin wound around the bobbin, and a bobbin cap which prevents the bobbin from being separated from the inner kiln and fixes the position of the inner kiln by the hook holder.

In particular, since the bobbin can be wound around a small amount of bobbin thread because of its relatively small size, the bobbin is frequently replaced due to the consumption of the bobbin thread during sewing. As such, there are problems such as unnecessary work time due to the interruption of work due to the replacement of bobbins, recombination of the lower thread, the hassle of replacing the bobbin, and deterioration of product quality.

In order to solve the problems caused by frequent replacement of bobbins, there are a number of patent publications No. 195-11286, Utility Model Registration No. 20-256032, Publication No. 2003-53882 and Publication No. 2002-43919. Has been proposed.

In the above invention and devises, both the drive shaft for rotating the outer kiln is formed as a tubular body, and at the same time, a through hole communicating with the lower thread passage of the drive shaft is formed in the center of the outer kiln, and the lower thread passes through the stud of the inner kiln. The main point is to form a guide ball to be supplied to the lower thread supply device for the lower thread wound in the lower thread cone.

However, in the case of the lower thread supply device, since the lower thread blocks the space between the outer kiln and the inner kiln, there is a problem that the sewing process of the fabric is not performed from two times.

In detail, the hook formed on the outer hook rotates according to the rotation of the drive shaft, and the needle thread loop lowered by the needle rotates on the hook.

When the outer kiln is rotated by a certain angle, the inner needle thread of the needle thread loop is introduced into the space between the outer and the inner hook, and the outer needle thread is wrapped around the bobbin cap. When the outer hook is rotated by about 270 °, the needle thread loop is pulled out of the hook and at the same time wraps around the inner hook and passes through the lower thread.

In this way, the needle thread loop wraps around the inner hook, and thus, the needle thread loop hangs the lower thread passing through the through hole of the outer hook and the guide hole of the inner hook when the needle thread loop is raised, thereby preventing smooth sewing. There is.

The present invention for solving the problems of the conventional sewing machine lower thread supply device can smoothly pass the inner thread through the needle thread loop wrapped around the inner ear while simultaneously supplying the lower thread of the lower thread cone to the lower thread supply device. There is a purpose to provide a sewing machine lower thread supply device improved work efficiency, such as sewing is made smoothly, and there is no hassle to replace the bobbin.

The present invention for achieving the above object is rotated by a hollow drive shaft and the outer hook is formed, the inner kiln is rotatably coupled to the outer hook, and fixed to the inner hook and positioned by the hook It is configured to include a bobbin cap is fixed, the through-hole is formed in the center of the outer hook through which the lower thread passing through the hollow drive shaft is formed, the guide hole penetrates from the left and right to the hook is formed to the drawn out through the through hole It provides a lower thread supply device of the sewing machine, characterized in that the lower thread penetrates.

And it provides a lower thread supply device for a sewing machine, characterized in that the tension adjustment member for adjusting the tension of the lower thread passing through the guide hole in the guide hole formed in the hook of the outer kiln.

In addition, there is provided a guide tube which is fixed in position so as not to rotate with the drive shaft in the through hole of the hollow drive shaft and the outer kiln, and provides a lower thread supply device of the sewing machine, characterized in that the lower thread is passed into the guide tube. .

Hereinafter, the lower thread supply device of the sewing machine of the present invention will be described in more detail with reference to the following examples, and the scope of the present invention is not limited to the following embodiments, but is within the scope not departing from the technical gist of the present invention. Of course, it can be variously modified by those skilled in the art.

1 is a perspective view schematically showing a lower thread supply device of an sewing machine according to an embodiment of the present invention, Figure 2 is an exploded perspective view schematically showing the outer kiln, inner hook and bobbin cap separated, Figure 3 is a line AA of Figure 2 Fig. 4 is a cross-sectional view schematically showing a cross-sectional state according to the present invention, and Fig. 4 is a cross-sectional view schematically showing a cross section of a state in which the outer kiln is mounted on the drive shaft and the guide tube.

The lower thread supply device of the sewing machine according to one embodiment of the present invention includes a driving shaft 110, an outer kiln 150, an inner kiln 170, and a bobbin cap 190 as shown in FIGS. 1 and 2. On the other hand, the inner kiln 170 and the bobbin cap 190 is the same as the structure and operation of the conventional outer kiln 150 and the bobbin cap 190, so a detailed description thereof will be omitted.

The drive shaft 110 rotates the outer kiln 150 as shown in FIG. 4, and guides the lower thread 910 wound around the lower thread cone to be smoothly supplied to the outer kiln 150 and the inner kiln 170. For the purpose, the drive shaft 110 is made of a hollow shaft.

In this case, although the lower thread 910 wound on the lower thread cone may pass directly through the hollow drive shaft 110, the lower thread 910 may be flammed by the rotating drive shaft 110 to cause sewing defects. Since there is a risk of trimming due to friction due to rotation at the end of the drive shaft 110, as shown in Figure 4 guide tube 130 fixed to the hollow drive shaft 110 so as not to rotate with the drive shaft 110 It is preferable to guide the lower thread 910 wound on the lower thread cone through the guide tube 130 to the outer kiln 150.

A through-hole 154 communicating with the guide tube 130 is formed at the center of the outer kiln 150 as shown in FIGS. 3 and 4, and the needle thread loop 930 formed through a needle moving upward and downward is formed. One side of the hook 152 to be rotated by walking is formed with a guide hole 153 penetrating from side to side.

The lower thread 910 supplied through the guide tube 130 sequentially passes through the through hole 154 of the outer kiln 150 and the guide hole 153 formed in the kiln 152.

On the other hand, the guide hole 153 of the hook 152 is preferably formed to be inclined at a predetermined angle in the rotational direction of the outer kiln 150 toward the outside, which is the lower thread 910 smoothly without the guide To pass through the ball (153).

5 is a partial perspective view schematically illustrating an enlarged state in which the tension adjusting member 210 is mounted on the hook 152, and FIG. 6 is a cross-sectional view schematically illustrating a cross-sectional state along the line B-B of FIG. 5.

And the guide hole 153 formed in the hook 152 of the outer kiln 150 is further provided with a tension control member 210 that can adjust the tension of the lower thread 910 passing through the guide hole 153 Preferably, this is to prevent the lower thread 910 from falling out of the guide hole 153 of the hook 152 when the outer hook 150 is rotated by the drive shaft 110.

In detail, the configuration of the tension control member 210 is not limited to a large, screw hole formed to communicate with the guide hole 153 on the upper surface of the hook 152, and is screwed to the screw hole Although it may be formed by a tension adjusting screw for adjusting the tension of the lower thread 910, it is preferable to further include a tension adjusting plate 212 in the screw hole as shown in Figs.

That is, a rectangular fixing hole 216 formed to insert and fix the tension control plate 212 on the upper surface of the hook 152 and the rectangular fixing hole on the upper surface of the hook 152. A screw hole 218 formed to have an inner diameter greater than a width of the 216 and a screw hole 218 are screwed into the screw hole 218 to press the tension adjusting plate 212 to guide the hole 153 of the hook 152. It consists of a tension adjusting screw 212 to impart a friction force to the lower thread 910 passing through.

In the outer kiln 150, the inner kiln 170 is rotatably coupled, and the inner kiln 170 is fixed in position by a bobbin cap 190 fixed to the inner kiln 170. Although not shown in the drawing, the position of the bobbin cap 190 is fixed by the hook holder installed in the sewing machine, and thus the inner kiln 170 does not rotate like the outer kiln 150.

Hereinafter, the sewing process by the lower thread supply device of the present invention will be described with reference to the drawings.

Before sewing the fabric, the lower thread 910 wound up in the lower thread cone in advance passes through the guide hole 153 formed in the guide tube 130 and the hook 152 of the outer hook 150 as shown in FIG. 4. In addition, by applying power to the motor, the needle-mounted needle rod is vertically moved, and at the same time, the drive shaft 110 is rotated to rotate the outer kiln 150.

In this case, the lower thread 910 between the guide hole 153 and the guide tube 130 is positioned in a space between the outer kiln 150 and the inner kiln 170.

7 is a view showing a state just before the hook 152 of the rotating outer kiln 150 hangs the needle thread loop 930 which descends together with the needle, and FIGS. 8 to 12 are views of the outer kiln 150. It is a figure which shows the step of forming a bark according to rotation sequentially.

As shown in FIG. 7, when the lower thread 910 is pulled out by a predetermined length with the guide hole 153 formed in the hook 152 of the outer kiln 150, the outer kiln 150 is rotated as shown in FIG. 8. The hook 152 is rotated by walking the needle thread loop 930 located below the hook 152 by the lowering of the needle. When the hook 152 rotates at a predetermined angle while the needle thread loop 930 is held, the inner needle thread 932 of the needle thread loop 930 is the outer kiln 150 and the needle thread loop 930 as shown in FIGS. 9 and 10. Rotating in the state moved to the space between the outer kiln 150 and the inner kiln 170 by the action of the inner kiln 170, the outer needle thread 934 is fixed to the inner kiln 170 The bobbin cap 190 is rotated while wrapping. In this case, the lower thread 910 is located in the needle thread loop 930.

And when the outer kiln 150 rotates about 270 ° as shown in FIG. 11, the needle thread loop 930 caught by the hook 152 is pulled out of the hook 152, but not shown in the drawing. Needle thread take-up pulls the needle thread 910 upward.

When the needle thread 910 exiting from the hook 152 is pulled by the needle thread take-up, the lower thread 910 drawn to the guide hole 153 of the hook 152 by a predetermined length is the needle thread loop ( Since the lower thread 910 is located in the needle thread loop 930 as shown in FIG. 11, a bar 950 is formed in the fabric 970.

As the outer kiln 150 rotates, the hook 152 is rotated by hooking the needle thread loop 930 formed by the lowering of the needle again as shown in FIG. 12. 8 to 12 by repeating the operation is made to the fabric 970 continuously by the needle thread and the lower thread 910.

As described above, the lower thread supplying device of the sewing machine of the present invention has a through hole through which a lower thread passing through a hollow drive shaft is formed in the center of the outer kiln, and a guide hole penetrates to the right and left of the hook of the outer kiln is formed. By configuring the lower thread drawn out through the through hole, the lower thread of the lower thread cone can be smoothly supplied, and the lower thread passing through the through hole of the outer kiln passes through the space between the outer and inner kilns, Since the needle thread loop that wraps around the inner hook is passed through smoothly without being caught by the lower thread because it is drawn out by the guide hole formed in the hook of the hook, the sewing is effectively performed.

In addition, when all the bobbin thread wound on the bobbin is exhausted by sewing, the bobbin cap is separated from the kiln, the bobbin is separated from the kiln, the bobbin is wound on the separated bobbin, and then the bobbin is mounted on the kiln again. Then, there was a hassle to fix the bobbin cap to the inner kiln, but in the case of the bobbin feeder of the present invention, the hollow bobbin drive shaft, the bobbin thread wound on the bobbin thread wound by the bobbin relatively large amount By sequentially passing through the guide holes formed on the top of the hook of the outer kiln, the bobbins are not required to be frequently removed and mounted, and the work time can be greatly reduced, and the defect rate of the product can be significantly reduced. There is an effect that can greatly improve the work efficiency.

In addition, by providing a tension adjusting member for adjusting the tension of the lower thread in the guide hole, there is an effect that can prevent the lower thread from falling out of the guide hole during the rotation of the outer kiln.

And a guide tube which is fixed to the hollow drive shaft and the through-hole of the outer kiln so as not to rotate with the driving shaft, thereby preventing flammability from being imparted to the lower thread when the lower thread is supplied to the outer kiln through the drive shaft. At the same time there is an effect that can be prevented in advance that the trimming occurs.

Claims (3)

It consists of an outer kiln is rotated by the drive shaft of the hollow and the kiln is formed, the inner kiln is rotatably coupled to the outer kiln, and the bobbin cap is fixed to the inner hook and fixed by the kiln, The through-hole is formed in the center of the outer kiln through which the lower thread passing through the drive shaft of the hollow is formed, the guide hole penetrates to the left and right of the hook is formed so that the lower thread drawn out into the through hole is penetrated. Lower thread feeder. The lower thread supply device of a sewing machine according to claim 1, wherein a tension adjusting member for adjusting the tension of the lower thread passing through the guide hole is provided in the guide hole formed in the hook of the outer kiln. 3. The lower thread supply of a sewing machine according to claim 2, wherein a guide tube is provided in the hollow drive shaft and the through-hole of the outer kiln so as not to rotate with the drive shaft, and a lower thread is passed into the guide tube. Device.

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