KR200364370Y1 - A rotary shuttle device with a part opened bobbin case body for sewing machine - Google Patents

Abstract

The present invention has a bobbin case body is formed in a part of the open type in which the main wall is minimized within the extent that the radius of the bobbin case body is extended and does not invade the lower thread take-off area, the bobbin case base forms a depression to cut a part of the main wall, the radius is The lower thread take-off part of the extended bobbin case body is installed so that the lower thread receiving space is remarkably increased without affecting the tension of the lower thread, thereby improving the sewing workability and sewing quality. It relates to a rotary book device.

The present invention for realizing this, a hook body (Hook Body) mounted on the drive shaft, a bobbin case base (Bobbin Case Base) and a bobbin case for holding the bobbin from the outside is accommodated in the hook body and the stud is installed on the bottom A bobbin case including a bobbin case body and a bobbin installed in the bobbin case and wound around a bobbin thread, and the bobbin case base has a step portion at one side of the main wall. The bobbin case body is a rotary drum device of a sewing machine comprising a main wall having a latch portion formed with a latch and a leaf spring guide member, and the bobbin case body has a radius of the main wall extending and withdrawing the lower thread. Only the lower thread withdrawal part, which is the area where the ball and the guide member are installed, is saved and the remaining area is composed of some open type. The bobbin case base is characterized in that a recess is formed on a part of the inner circumferential surface of the main wall so that the front end of the bobbin case body can be inserted into the bobbin case body.

Description

Rotating drum device for sewing machine with some open bobbin case body {A ROTARY SHUTTLE DEVICE WITH A PART OPENED BOBBIN CASE BODY FOR SEWING MACHINE}

The present invention relates to a rotating book device of a sewing machine, and in particular, the bobbin case body is formed in a part of the open type that the main wall is minimized within the range that the radius is extended and does not invade the lower thread extraction area, the bobbin case base is a part of the cutting main wall Part that makes remarkable improvement of productivity of sewing machine work and high quality sewing sewing by forming a recessed part and inserting the lower thread withdrawal part with an extended radius to increase the lower thread receiving space without affecting the tension of the lower thread at all. The present invention relates to a rotary book apparatus of a sewing machine having an open bobbin case body.

In general, as shown in Figure 1, the sewing book rotary device 100 of the prior art 1 for supplying the lower thread is installed. The rotary book device 100 is mounted on a drive shaft 110 rotatably connected to a power unit, also referred to as a hook body (Hook Body) 120, and a bobbin case housed in the hook body 120 ( Bobbin Case: BC) and the bobbin bobbin (Bobbin) 140 is wound around, the bobbin case (BC) is accommodated in the hook body 120, and also called the bobbin case base (Bobbin Case Base) ( 130 and a bobbin case body 150 for accommodating the bobbin from the outside of the bobbin 140.

The bobbin case body 150 serves to guide the lower thread released from the bobbin to the sewing area. The bobbin case body 150 is formed of a hook portion 152 and a main wall 153 having a latch 151 formed thereon, and a bobbin on one side of the main wall 153. A drawing member 155 for drawing out the lower thread released from the 140 is formed, and guide members 155 formed in a leaf spring shape to guide the lower thread coming out through the drawing hole 154 and to prevent the lower thread from being separated. ) Is provided.

A stud 131 is installed at the bottom of the bobbin case base 130 into which the bobbin case body 150 is inserted and installed to rotatably install the bobbin 140, and guides of the bobbin case body 150. A stepped portion 133 is formed in which a part of the circumferential wall is formed low so that the portion where the member 155 is formed is coupled.

According to the configuration of the bobbin case BC, the lower thread loosened from the bobbin 140 is formed between the outer surface of the main wall and the guide member 155 via the lower thread outlet hole 154 of the main wall 153 of the bobbin case body 150. You will pass by.

Referring to the operation of the rotary book device schematically, the hook body 120 is rotated by the rotation of the drive shaft 110 and the bobbin is released from the bobbin 140 while forming a noose around the bobbin case (BC: 130,150) by walking the upper thread. The lower thread drawn out through the lower thread drawing hole 154 and the guide member 155 of the case body 150 is mounted on the upper thread noose, so that sewing is performed.

In this sewing operation, the upper thread should first be able to smoothly raise the lower thread, and the tension of the upper thread and the lower thread made in this way should be balanced. If the tension of the lower thread becomes stronger or weaker than the set tension, tension imbalance occurs between the upper thread loop, causing single yarn to break the thread or loop phenomenon (towel phenomenon) that causes the thread to be interrupted. It lowers the sewing quality.

On the other hand, as the amount of the lower thread in the sewing machine increases the bobbin replacement to increase the work productivity, various efforts are being made for this, and the applicant has already proposed various techniques for increasing the lower thread.

In order to increase the amount of closed room, it is necessary to expand the internal space of the bobbin and the bobbin case accommodating the bobbin. As a technique for this, a perspective view in FIG. 2A and a cross-sectional view of the state of use in FIG. 2B (guide member 255 are omitted) The prior art 2 (200) including the bobbin case body 250 as shown is known. Prior art 2 (200) in the configuration of the bobbin case body 250 to remove the portion of the main wall 253 is inserted into the bobbin case base and configured to be an open type leaving only a portion adjacent to the ridge portion 252 bobbin case body 250 By not allowing the circumferential wall of) to enter into the bobbin case base 230, the bobbin 240 occupies the space occupied by the circumferential wall 153 of the bobbin case body 150 in the internal space of the bobbin case base 130 in the prior art 1 Winding around is to switch to the lower room. Such a configuration of the prior art 2 can significantly increase the amount of lower thread.

However, the prior art 1 (100) in which the lower thread drawing hole 154 and the guide member are located at the center because the lower thread drawing hole 254 and the guide member 255 should be formed as close as possible to the side of the rib part 252. Compared to the bobbin case body 150 of the bobbin case 252 is biased. As the lower thread draw-out hole 254 and the guide member 253 are positioned to one side, as shown in FIG. 2B, the extraction angle 2θ2 of the lower thread T is narrowed so that the thread wound adjacently is taken out at the time of extraction. There is a fatal problem that the collision occurs that causes tension imbalance and single yarn or loop phenomenon occurs.

That is, the prior art 2 (200) can increase the amount of lower thread, but is a technique that is difficult to apply in practice.

The present invention has been devised to solve the above problems,

The object of the present invention is that the bobbin case body is extended in radius and is formed in a part of the open type, the bobbin case base cuts a part of the main wall to form a depression so that the bobbin case body of the bobbin case body in which the radius is extended is inserted and installed therein. ,

The present invention provides a rotary drum device of a sewing machine having a part of an open bobbin case body that significantly increases the productivity of a sewing machine and a high quality sewing by significantly increasing the lower thread receiving space without affecting the tension of the lower thread.

1 is an exploded perspective view of the prior art 1

Figure 2a is a perspective view of the bobbin case body of the prior art 2

Figure 2b is a cross-sectional view of the use state of Figure 2a

3 is an exploded perspective view of an embodiment according to the present invention

4 is a perspective view from another perspective of the bobbin case body of FIG.

5 is an enlarged cross-sectional view of the combined use state of FIG.

* Explanation of symbols for main parts of the drawings

1: rotary book device 10 of the present invention: drive shaft

20: hook body BC: bobbin case

30: bobbin case base 31; Stud

32: main wall 32a: inner circumference

33: stepped portion 35: depression

40: bobbin 50: bobbin case body

51: latch 53A: lower thread outlet

54: drawing hole 55: guide member

100: rotary book device of prior art 1 150: bobbin case body of prior art 1

200: Rotary book device of the prior art 2 230: Bobbin case base of the prior art 2

250: bobbin case body of the prior art 2

Rotating drum device of the sewing machine having a part of the open bobbin case body according to the present invention to achieve the above object,

Hook body (Hook body) mounted on the drive shaft, a bobbin case base (Bobbin Case Base) accommodated in the hook body and the stud is installed on the bottom and the bobbin case body (Bobbin Case Body) for holding the bobbin from the outside Bobbin Case (Bobbin Case), which is installed in the bobbin case and comprises a bobbin (Bobbin) wound around the bobbin,

The bobbin case base has a stepped portion formed at one side of the main wall, and the bobbin case body is formed on a rotary book apparatus of a sewing machine including a main portion having a latch formed with a latch and a leaf spring guide member. In

The bobbin case body has a radius of the circumference of the main wall is extended and consists of a part of the open form that only the lower thread drawer which is the area where the lower thread draw-out hole and the guide member are installed, and the remaining region is opened,

The bobbin case base is characterized in that a recess is formed on a portion of the inner circumferential surface of the circumferential wall so that the front end portion of the bobbin case body lower thread withdrawal portion can be inserted therein.

Hereinafter, with reference to the accompanying drawings an embodiment of a rotary book device of a sewing machine having a part of an open bobbin case body of the present invention will be described in more detail.

Figure 3 is an exploded perspective view showing the configuration of one embodiment according to the present invention, Figure 4 is a perspective view of another view of the bobbin case body 50 in Figure 3, Figure 5 is an enlarged sectional view of the coupling (guide member 55) of Figure 3 Omitted).

Rotary book device 1 of the sewing machine having a part of the open bobbin case body according to the present invention, as shown in Figures 3 to 5, the hook body (Hook Body) 20 is mounted to the drive shaft 10 ), The bobbin case body 30 accommodated in the hook body 20 and a stud 31 is placed on the bottom and a bobbin case body 50 for holding the bobbin from the outside. Bobbin case (BC) consisting of a (B), the bobbin (BC) is installed in the bobbin case (BC) and comprises a bobbin (Bobbin) 50 is wound around the bobbin,

The bobbin case base 30 has a step portion 33 formed at one side of the main wall, and the bobbin case body 50 has a curled portion 52 having a latch 51 formed thereon. It is made of a main wall is provided with a leaf spring guide member 55,

The bobbin case body 50 has a part of an open shape in which the radius of the circumferential wall is extended and only the lower thread drawing part 53A, which is an area where the lower thread drawing hole 54 and the guide member 55 are installed, is saved and the remaining area is opened. The bobbin case base 30 has a recessed portion 35 formed in a portion of the inner circumferential surface of the main wall 32 in order to accommodate the front end portion 53a of the bobbin case body 50, the lower thread lead-out portion 53A. .

Here, the recess 35 of the bobbin case base is formed inside the step portion 33 of the main wall, and a step 35 is formed between the inner circumferential surface 32a of the tip 35a close to the bottom surface.

In the present invention, the radial expansion dimension of the main wall of the bobbin case body 50 corresponds to the thickness dimension of the main wall, and the depression dimension of the depression 35 of the bobbin case base 30 is also correspondingly formed.

The recessed part 35 of the bobbin case base 30 cuts a part from the thickness of the circumferential wall 32 by cutting a part on the inner circumferential surface 32a, and withdraws the lower thread of the bobbin case body 50 inserted therein. The portion 53A is within the range where the guide member 55 and the drawing hole 54 do not deviate from the positions of the guide member 155 and the drawing hole 154 in the original position, that is, the prior art 1 (100). It is formed so as to minimize, so the width corresponding to the step portion 33 of the bobbin case base 30.

Such a configuration is that the lower thread take-out part 53A, which is the main wall of the bobbin case body 50, is located in the main wall 32 rather than the inner space of the bobbin case base 30, and thus, of the bobbin case base 30. As a result, the radius of the inner space is expanded, which significantly increases the capacity of the lower thread.

According to the present invention, the bobbin case body of the bobbin case body 50 is located at the center of the bobbin case body 50 while increasing the bobbin case amount of the bobbin case as described above. 150, there is no change in the withdrawal angle θθ1 of the lower thread T.

Therefore, regardless of the amount of the lower thread is increased, the tension of the lower thread (T) is maintained accurately, and the single yarn or loop phenomenon, which was a problem in the prior art 2, is prevented.

In the above, preferred embodiments of the present invention have been described with reference to the accompanying drawings. Here, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical spirit of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

As described in detail above, the rotary book device of the sewing machine having an open bobbin case body according to the present invention is a part of an open type in which the main wall is minimized within a range in which the bobbin case body is extended in radius and does not invade the lower thread extraction area. The bobbin case base has a recessed portion cut from a part of the circumferential wall, and the bobbin case body of the bobbin case body having an extended radius is inserted therein so that the bobbin case space is not affected at all without affecting the tension of the bobbin thread. Significantly increased, and thus, the productivity and high-quality sewing quality of the sewing machine work is significantly improved.

Claims (2)

Hook body 20 mounted on the drive shaft 10, the bobbin case base (30) and bobbin accommodated in the hook body 20 and the stud 31 is placed on the bottom Bobbin case (BC) consisting of a bobbin case body (Bobbin Case Body) 50 for holding from the outside, and installed in the bobbin case (BC) and includes a bobbin (Bobbin) 50 wound around the bobbin (BC) Configured by The bobbin case base 30 has a step portion 33 formed at one side of the main wall, and the bobbin case body 50 has a curled portion 52 having a latch 51 formed thereon. In the rotary book device of the sewing machine consisting of a circumferential wall provided with a leaf spring guide member 55, The bobbin case body 50 has a radius of the circumferential wall is extended and consists of a part of the open shape that only the lower thread draw-out portion 53A, which is an area where the lower thread draw-out hole and the guide member 55 are installed, and the remaining region is opened. The bobbin case base 30 is characterized in that the recessed portion 35 is formed on a part of the inner circumferential surface of the circumferential wall 32 in order to accommodate the front end portion 53a of the bobbin case body 50, the lower thread lead-out portion 53A. Rotary book device of the sewing machine having a part of the open bobbin case body. The method of claim 1, The bobbin case base recessed part 35 is formed inside the step part 33 of the circumferential wall, and the tip 35a close to the bottom surface is partially open bobbin characterized in that a step is formed between the inner circumferential surface 32a. Rotary book device of the sewing machine provided with a case body.