KR100636955B1 - Bobbin case - Google Patents

Abstract

The bobbin case 40 set in the shuttle disposed below the needle plate has a bobbin case main body 42 for accommodating the bobbin bobbin 50 therein and a bobbin thread 52 wound around the bobbin bobbin 50. It has a lower thread guide device for guiding through the case body 42 toward the needle hole provided in the needle plate. The lower thread guide device has a lower thread guide 44 fixed to the bobbin case body 42, and the lower thread guide 44 is a guide portion 45 for redirecting the direction of the lower thread 52 toward the needle hole. This guide portion 45 is located below the needle tip of the sewing needle when the bottom dead center is reached through the needle hole. Therefore, even when vibration occurs in the sewing needle, interference between the needle tip and the lower thread guide can be prevented, and the lower thread can be guided stably and reliably.

Description

Bobbin case {BOBBIN CASE}

1 is a plan view showing the shuttle mechanism of the sewing machine.

2 is a front view showing the shuttle mechanism of the sewing machine.

3 is a front view showing a bobbin case.

4 is a plan view of the bobbin case.

5 is a perspective view showing a bobbin case.

<Explanation of symbols for the main parts of the drawings>

12: needle plate 14: needle hole

26: sewing needle 40: bobbin case

42: bobbin case body 44: lower thread guide

45: guide portion 50: bobbin bobbin

52: lower thread

The present invention relates to a bobbin case in which a bobbin bobbin is accommodated in a sewing machine.                         

The lower thread drawn out in the bobbin case is guided by the lower thread guide in order to keep the position toward the needle hole from the lower side of the needle plate. Coil-shaped components are generally used for this bobbin thread guide, and this is fixed to the upper part of the front side of a bobbin case. Moreover, the technique which simplified the shape and made it hard to pull out a lower thread by using the lower thread guide which bent the spring material, such as steel wire, in S shape is also known (for example, Japanese Utility Model Registration No. 2568827). Publication).

The lower thread guide is provided with a guide part which redirects the direction of the lower thread drawn out from the inside of the bobbin case in the direction of the needle hole. It is preferable to arrange | position this guide part just under the needle hole from the role. However, it is necessary to avoid interference between the needle tip of the sewing needle coming down through the needle hole and the guide part, thereby shifting the position of the guide part forward from just under the needle hole.

When the sewing needle vibrates due to any cause during sewing, the guide portion of the lower thread guide and the needle tip of the sewing needle reaching the bottom dead center interfere with each other and cause needle bending. Therefore, a technique has been proposed in which a bobbin case itself is formed without using a separately formed part as a bobbin thread guide, and guides the bobbin through the bobbin thread (Japanese Patent Laid-Open No. 6-31680). However, such a lower thread guide groove needs to be formed in a tunnel shape in order to change the lower thread, and there are limitations on the place where the lower thread guide groove is installed and the direction and shape of the tunnel. For this reason, it was unsuitable to carry out guiding and turning of a lower thread stably and reliably. In addition, since the lower thread guide groove has a tunnel shape, the work to pass the lower thread passes.

An object of the present invention is to provide a bobbin case capable of stably and reliably guiding a lower thread.

A first aspect of the present invention is a bobbin case set in a shuttle disposed below the needle plate, wherein the bobbin case body for accommodating the bobbin bobbin therein and the bobbin thread wound on the bobbin bobbin through the bobbin case main body to be used above. It has a lower thread guide device for guiding toward the needle hole provided in the needle plate, the lower thread guide device has a lower thread guide fixed to the bobbin case body, the lower thread guide to redirect the lower thread direction in the direction toward the needle hole The guide portion is a bobbin case positioned below the needle tip of the sewing needle when the needle portion passes through the needle hole and reaches a bottom dead center.

According to this configuration, even when vibration occurs in the sewing needle, the needle tip does not interfere with the lower thread guide. For this reason, the lower thread can be guided stably and reliably without being interrupted by the needle tip. In addition, needle bending due to such interference can be prevented.

It is preferable that the lower thread guide extends substantially parallel to the surface of the needle plate on the front side of the bobbin case main body, and one end of the lower thread guide is fixed to the bobbin case main body, and the other end forms the guide part.

This facilitates the design for positioning the guide portion below the needle tip of the sewing needle when the bottom dead center is reached.

Moreover, it is preferable that the guide part of the lower thread guide has a hook shape which can receive the lower thread drawn out from the lower thread bobbin accommodated in the bobbin case main body from the front side of the bobbin case main body.

For this reason, the operation | work which makes a bobbin thread pass through a bobbin thread guide becomes a simple operation only by hanging a bobbin thread from the front side of a bobbin case main part in a hook-shaped guide part, and it becomes difficult to pull a bobbin thread from a bobbin thread guide.

Moreover, the 2nd aspect of this invention is a bobbin case set to the shuttle arrange | positioned under the needle plate, The bobbin case main body which accommodates a bobbin bobbin inside, and the bobbin case wound around the bobbin bobbin are made into the bobbin case main body. It has a lower thread guide device for guiding toward the needle hole provided in the needle plate, the lower thread guide device has a lower thread guide fixed to the bobbin case body, and a guide groove provided in the bobbin case body, the lower thread guide is A guide portion for redirecting the lower thread direction in the direction toward the needle hole, the guide groove is a bobbin case for guiding from the lower thread bobbin of the lower thread drawn out from the lower thread bobbin to the lower thread guide.

According to this configuration, the lower thread reaches the lower thread guide through the guide groove from the lower thread bobbin, and the lower thread from the lower thread bobbin to the lower thread guide is guided by the guide groove of the upper thread by the knife tip accompanying the rotation of the shuttle (outer shuttle) You can be sure to follow the route that will not interfere with the call. In addition, the lower thread can be guided in a direction suitable for the change of the lower thread by the lower thread guide. For this reason, guidance of a lower thread can be performed stably and reliably.

Further, by combining the guide groove of the second aspect with the lower thread guide of the first aspect, the guide of the lower thread can be performed more stably and reliably.

<Example>

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

1 is a plan view showing the shuttle mechanism of the sewing machine, Figure 2 is a front view showing the shuttle mechanism similarly. The shuttle support 10 shown by these figures is located on the sewing frame F (FIG. 2) in the lower part of a sewing head (not shown). The needle plate 12 is fixed to the upper surface of the shuttle support 10, and the shuttle 30 is positioned below the needle plate 12. As shown in FIG. 2, the needle plate 12 includes a needle hole 14 through which a needle 26 is inserted, and through the needle hole 14, the needle tip of the needle 26 is shuttle 30. Descends to the front upper part.

The shuttle shaft 10 is supported so that the lower shaft 16 can rotate in the rear part. Moreover, the shuttle shaft 20 is supported by the center part of the shuttle support body 10 so that an axis line may rotate in the direction orthogonal to each other with respect to the lower shaft 16. As shown in FIG. The lower shaft 16 is rotationally driven in one direction by a motor (not shown) which is a drive source of the shuttle 30. The rotation of this lower shaft 16 is transmitted relative to the shuttle shaft 20 through the engagement of the luxury gears 18, 22 fixed above the respective shafts.

The shuttle 30 is mounted at the end of the shuttle shaft 20, and by the rotation of the shuttle shaft 20, the outer shuttle 32 in one direction from the outside of the inner shuttle 36 (counterclockwise rotation in FIG. 2). Rotate with). At this time, the convex part of the shuttle support 38 fixed to the shuttle support 10 on the front upper part of the inner shuttle 36 so that the inner shuttle 36 does not turn along by the outer shuttle 32 ( 38a) is engaged. Moreover, the bobbin case 40 which accommodated the bobbin bobbin is set in the center of the internal shuttle 36.

3 is a front view of the bobbin case 40, FIG. 4 is a plan view of the bobbin case 40, and FIG. 5 is a perspective view of the bobbin case 40. As is also apparent from these figures, the bobbin case main body 42 has a circular drum shape whose rear side is open. With respect to the inside of the bobbin case main body 42, the bobbin bobbin 50 (FIG. 3) can be made to go in and out from the opened back side. The bobbin bobbin 50 accommodated therein is freely supported by a shaft (not shown) at the center of the bobbin case body 42.

In the upper part of the front side of the bobbin case main body 42, the notch part 42a for avoiding interference with the needle tip of the sewing needle 26 is provided. Moreover, the thread lead-out hole 42b for drawing out the lower thread wound by the lower thread bobbin 50 is formed in the side surface of the bobbin case main body 42 outer periphery (FIG. 5). Similarly, one end of the thread adjustment spring 42c using the leaf spring is attached to the lower surface of the bobbin case main body 42 outer periphery by screwing. By the elasticity of this thread adjustment spring 42c, a resistance is applied to the lower thread which passes through this, and a predetermined tension is given.

The guide groove 42f is provided in the bobbin case main body 42 outer periphery by the thread drawer outlet 42b side. The lower thread drawn out from the thread lead-out hole 42b is led to this guide groove 42f. Moreover, in the front part of the bobbin case main body 42, the upper surface 42d facing the notch part 42a becomes a flat surface substantially parallel to the surface of the needle plate 12. As shown in FIG. On this upper surface 42d, a recess 42e is formed on the front side of the bobbin case main body 42. As shown in FIG.

The lower thread guide 44 is arrange | positioned substantially in parallel with the upper surface 42d, the one end part is fixed to one wall surface of the notch part 42a, and the other end is the guide part 45 bent in hook shape. A metal wire rod (wire) is used for the lower thread guide 44, and the guide portion 45 is located almost above the center of the bobbin case body 42, i.e., just below the needle hole 14. As shown in FIG.

The guide part 45 has the hook shape of the shape which was bent toward the front surface of the bobbin case main body 42 once, and was folded back toward the fixed end side of the lower thread guide 44. Furthermore, the tip portion 45a of the guide portion 45 is bent slightly downward and enters the recessed portion 42e of the upper surface 42d (FIGS. 3 and 5). However, a gap that allows the lower thread to pass through is secured between the tip portion 45a and the recessed portion 42e (FIG. 3). And the lower thread guide 44 is attached so that the guide part 45 may be located below the needle tip of the sewing needle 26 when it reaches the bottom dead center through the needle hole 14.

On the front side of the bobbin case main body 42, the handle 46 is provided so that the front-end | tip part on the right side of a figure may be raised in front of a hinge pin (not shown) as a pivot point. By raising this handle 46 directly forward, the lock of the bobbin case 40 with respect to the internal shuttle 36 is released, and the bobbin bobbin 50 is locked without falling out of the bobbin case 40. This allows the bobbin case 40 to be detachable together with the bobbin bobbin 50 with respect to the internal shuttle 36.

In the bobbin case 40 configured in this manner, the lower thread 52 (FIGS. 3 and 5) drawn out of the bobbin case body 42 from the thread extraction hole 42 b passes through the guide groove 42 f. The guide portion 45 of the lower thread guide 44 is caught. By this guide part 45, the direction of the lower thread 52 is turned so that it may face the needle hole 14 of the needle board 12. As shown in FIG. As described above, the guide portion 45 is located below the needle tip of the sewing needle 26 when the bottom dead center is reached during the operation of the sewing machine. For this reason, even when the sewing needle 26 during sewing generate | occur | produces the front-back direction vibration, the needle tip does not interfere with the guide part 45, and needle bending resulting from this interference is prevented.

Moreover, the lower thread 52 can perform threading with respect to the lower thread guide 44 only by simply attaching to the hook-shaped guide part 45 in the front side of the bobbin case main body 42. As shown in FIG. In addition, since the tip portion 45a of the guide portion 45 has a slight gap with respect to the recess 42e of the bobbin case body 42, the lower thread 52 caught by the guide portion 45 is pulled out. It's hard.

As described above, the present invention has the effect of guiding the lower thread stably and reliably.

Claims (8)

A bobbin case set in a shuttle disposed below the needle plate, The bobbin case body which accommodates a bobbin bobbin inside, It has a bobbin thread guide device for guiding the bobbin thread wound on the bobbin bobbin through the bobbin case body toward the needle hole provided in the needle plate, The lower thread guide device has a lower thread guide fixed to the bobbin case body, and the lower thread guide has a guide part for redirecting the direction of the lower thread toward the needle hole, and the guide part passes through the needle hole and has a bottom dead center. The bobbin case located below the needle tip of the sewing needle when it reaches. The method of claim 1, A bobbin case in which a lower thread guide extends substantially parallel to a surface of a needle plate on the front side of the bobbin case main body, one end of which is fixed to the bobbin case main body, and the other end of which forms the guide part. The method according to claim 1 or 2, The bobbin case of the guide part of a lower thread guide becomes a hook shape which can receive the lower thread drawn out from the bobbin bobbin accommodated in the bobbin case main body from the front side of a bobbin case main body. The method according to claim 1 or 2, The bobbin guide device has a guide groove provided in the bobbin case body, and the guide groove performs a guide between the bobbin bobbin of the lower thread drawn out from the bobbin bobbin to the bobbin guide. The method of claim 3, wherein The bobbin guide device has a guide groove provided in the bobbin case body, and the guide groove performs a guide between the bobbin bobbin of the lower thread drawn out from the bobbin bobbin to the bobbin guide. A bobbin case set in a shuttle disposed below the needle plate, The bobbin case body which accommodates a bobbin bobbin inside, It has a lower thread guide device for guiding the lower thread wound on the lower thread bobbin through the bobbin case body toward the needle hole provided in the needle plate, The lower thread guide device has a lower thread guide fixed to the bobbin case body, and a guide groove installed on the bobbin case body, The lower thread guide has a guide part for redirecting the direction of the lower thread toward the needle hole, This guide groove is a bobbin case for guiding between the bobbin bobbin of the bobbin thread drawn out from the bobbin bobbin and the bobbin thread guide. A bobbin case set in a shuttle disposed below the needle plate, The bobbin case body which accommodates a bobbin bobbin inside, It has a bobbin thread guide device for guiding the bobbin thread wound on the bobbin bobbin through the bobbin case body toward the needle hole provided in the needle plate, The bobbin case is provided with a guide groove provided on the bobbin case body, the guide groove guides the lower thread drawn out of the bobbin case body from the bobbin bobbin through a thread adjustment spring. The method of claim 7, wherein The bobbin case communicates with the notch part provided in the bobbin case in order to avoid interference with the needle tip of the sewing needle.

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