KR100819906B1 - Needle defence rotary shuttle device of sewing machine - Google Patents

Abstract

A rotary shuttle device of a sewing machine is provided to guide a needle to move into a penetration hole of a bobbin case base securely even though the needle shakes greatly, thereby securely performing a sewing operation without breaking the needle. A rotary shuttle device comprises a hook body(20) installed on a driving shaft, a bobbin case housed in the hook body and consisting of a bobbin case base(30) and a bobbin case body(50), and a bobbin(40) installed within the bobbin case. A bottom thread is wound around the bobbin. A hole, through which a needle enters and exits, is formed in a main wall of the bobbin case base. A guide groove is formed in an end of the main wall adjacent to the penetration hole. A guide fence(32) is installed outside the penetration hole of the bobbin case base. The guide fence guides the needle falling into the penetration hole.

Description

Rotating drum device of sewing machine to prevent needle breakage {NEEDLE DEFENCE ROTARY SHUTTLE DEVICE OF SEWING MACHINE}

1 is an exploded perspective view of a typical sewing machine rotary book device

Figure 2 is a partially omitted cross-sectional view of the prior art needle lowering

Figure 3 is an exploded perspective view of the rotary book device of one embodiment according to the present invention

4 is an exploded perspective view of the bobbin case base of FIG.

5 is a cross-sectional view showing an operating state according to the present invention

6 is an assembled perspective view of the rotary book device of one embodiment according to the present invention;

* Explanation of symbols for main parts of the drawings

1: rotary book device 2: needle of the present invention

10: drive shaft 20: hook body

30: bobbin case base 31: stud

32: guide fence 32a: fence fence

32b: fastening portion 34: fastening means

35: through hole 37: guide groove

40: bobbin 50: bobbin case body

100: rotary book device of the prior art

The present invention relates to a rotating drum device of a sewing machine, and in particular, even in a situation where trembling of the needle is greatly caused, the needle is safely guided into the through-hole of the bobbin case base so that the needle breaks even when sewing thick fabrics or high-speed sewing. The present invention relates to a rotary drum device of a sewing machine, in which needle break is prevented to safely perform a sewing operation without concern.

In general, as shown in Figure 1, the sewing machine is provided with a conventional rotary book device 100 for supplying the lower thread. The rotary book device 100 is mounted on a drive shaft 110 rotatably connected to a power unit, also referred to as an outer hook, and includes a hook body 120 having a hook 121 and a hook body 120. The bobbin case (BC) is stored in the bobbin (Bobbin Case: BC) and the bobbin bobbin (Bobbin) 140 is wound up, the bobbin case (BC) is accommodated in the hook body 120, also referred to as a bobbin case It is composed of a base (Bobbin Case Base) 130, and a bobbin case body (150) for storing the bobbin from the bobbin 140 outside.

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 main wall 153 on one side thereof. There is formed a withdrawal hole 154 for withdrawing the lower thread released from the bobbin 140, the tension spring of the curved plate form to guide the lower thread exiting through the withdrawal hole 154 and to prevent the lower thread from being separated ) Is provided.

The stud 131 is installed at the bottom of the bobbin case base 130 into which the bobbin case body 150 is inserted, and the bobbin 140 is rotatably installed, and the tension of the bobbin case body 150 is installed. A stepped portion 133 is formed in which a part of the main wall is formed to be coupled to the portion where the spring 155 is formed, and a through hole 135 through which a needle threaded with upper thread is formed is formed at one side of the main wall. A guide groove 137 is formed at the tip of the circumferential wall adjacent to the 135.

The bobbin case (BC) consisting of the bobbin case base 130 and the bobbin case body 150 is integrally coupled and adjacent to the bracket (also called 'Osae', not shown) which is separately installed on the sewing machine body. The bobbin case (BC) is fixed so that the flow is prevented by being fitted into the guide groove (137) formed in the bobbin case base 130 to hold the position.

Looking at the operation of the rotary book device, the hook body 120 is rotated by the rotation of the drive shaft 110, and the bobbin case body 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 hole 154 of the 150, the tension spring 155, and the lower thread drawn out through the guide groove 137 of the bobbin case base is mounted on the upper thread noose, so that sewing is performed.

Looking at the lowering operation of the needle threaded in the upper thread in this operation process as shown in Figure 2 as the needle is raised and lowered is a pointed front end through the through hole 135 formed in the bobbin case base, the needle is While dragging the lower thread, there is a slight difference depending on the tension of the thread or the material of the sewing fabric, but the shaking phenomenon is always generated.

As the needle 2 is not vertically lifted into the through hole 135 and the vibration occurs, the guide part is inclined so that the needle is slid to the inside of the through hole even if a certain amount of vibration is generated at the inlet side of the through hole 135. 135a) is formed in the bobbin case base to prevent the needle 2 from colliding with the bobbin case base body and breaking.

However, since the guide part 135a is fixedly formed on the bobbin case base itself, position adjustment is impossible, and when the sewing material is thick material or high speed sewing, the vibration is further amplified so that the hook 121 of the hook body or Since the impingement to the position out of the guide portion, the needle is broken and the work is interrupted, thereby lowering productivity and sewing quality.

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

It is an object of the present invention to induce the needle to safely enter the through-hole of the bobbin case base even in the situation where trembling of the needle is greatly performed, so that the sewing operation can be safely performed without fear of breaking the needle even when sewing thick fabrics or high-speed sewing. It is to provide a rotary drum device of the sewing machine to prevent the needle break.

Rotating drum device of the sewing machine according to the present invention for achieving the above object,

Hook body mounted on the drive shaft (Hook body), Bobbin case (Bobbin Case) consisting of a bobbin case base (Bobbin Case Base) and a bobbin case body that is accommodated in the hook body and the stud is placed on the bottom, Installed in the bobbin case and comprises a bobbin bobbin (Bobbin) is wound,

In the bobbin case base is a sewing machine rotary book device in which a guide groove is formed at the tip of the main wall adjacent to the through hole and the through hole through which the needle enters one side of the main wall,

 The bobbin case base is characterized in that the guide fence for guiding the descending needle into the through-hole outside the through-hole inlet is installed.

Hereinafter, with reference to the accompanying drawings an embodiment of a rotary drum device of the sewing machine is prevented needle break of the present invention will be described in more detail.

Figure 3 is an exploded perspective view of a sewing machine rotary book device according to the embodiment of the present invention, Figure 4 is an exploded perspective view of the bobbin case base of Figure 3, Figure 5 is a cross-sectional view showing an operating state according to the invention, Figure 6 Assembly perspective view of the rotary book device according to an embodiment of the present invention.

As shown in Figure 3 to 6, the rotary drum device 1 of the sewing machine to prevent the needle break of the embodiment according to the present invention is a hook body (Hook Body) 20, which is mounted to the drive shaft 10, Bobbin case (Bobbin Case) consisting of a bobbin case base (30) and bobbin case body (50) accommodated in the hook body 20, the stud 31 is placed on the bottom ( BC), the bobbin case (BC) is installed in the bobbin (BC) and comprises a bobbin (Bobbin) 40 is wound around, the bobbin case base 30 is a through-hole 35 through which the needle enters and exits one side of the main wall; In the sewing machine rotary book device in which the guide groove 37 is formed at the tip of the main wall adjacent to the through hole 35, the bobbin case base 30 is lowered to the outside of the inlet of the through hole 35. The guide fence 32 for guiding the inside of the through hole 35 is installed.

Here, the guide fence 32 is formed of a fence portion 32a adjacent to the inlet side of the through hole 35 and a fastening portion 32b fixed to the main wall of the bobbin case base 30.

The fence portion 32a may be formed as a curved portion in which one end portion of the fence portion 32 is introduced into the through hole 35.

In addition, at least one fastening hole (h) is formed on the circumferential wall of the fastening portion 32b of the guide fence and the bobbin case base 30 corresponding thereto, and is preferably coupled and mounted by the fastening means 34.

As the fastening means 34, a screw, a rivet, or the like may be used, and may be welded.

With reference to Figure 5 looks at the operating state of the rotating drum device (1) of the sewing machine to prevent the needle broken in accordance with the present invention having such a configuration.

According to the present invention, the guide fence 32 is disposed outside the inclined guide part 35a which is the inlet of the bobbin case base 30 through hole 35 so that the needle 2 before the needle approaches the main wall of the bobbin case base 30. Guides the direction of travel toward the through hole (35).

In addition, since the guide fence 32 is assembled to the bobbin case base 30, the guide fence 32 has an advantage that the position can be adjusted so that the guide fence 32 can be arranged at the optimum position.

Therefore, even in a situation where trembling occurs in the needle 2 greatly, the guide fence 32 positioned at the point before the radius of amplitude is corrected corrects the direction of entry of the needle to induce the needle to safely enter the through hole 35. It is prevented from being moved to the main wall of the hook 21 or bobbin case base 30 of the hook body.

Due to this, even when sewing thick fabrics or high-speed sewing, which greatly causes the shaking of the needle, sewing can be safely performed without fear of breaking the needle.

 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 the common or dictionary meanings, but should be interpreted 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 idea 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, in the rotating book apparatus of the sewing machine which prevents needle breakage according to the present invention, the guide fence is securely inserted into the through hole at the point before the radius of the amplitude is opened even in the situation where the needle is trembling. By inducing correction to enter, there is an excellent effect that can be safely carried out without fear of needle break even when sewing thick fabrics or high-speed sewing.

Claims (4)

 Hook body 20 mounted on drive shaft 10, bobbin case base 30 and bobbin case housed in hook body 20 and stud 31 is placed on the bottom It comprises a bobbin case (BC) consisting of a body (Bobbin Case Body) 50, the bobbin (40) is installed in the bobbin case (BC), the bobbin thread is wound around, In the bobbin case base 30 is a sewing machine rotary book apparatus in which a guide hole 37 is formed at a tip of a main wall adjacent to the through hole 35 and a through hole 35 through which a needle enters and exits from the main wall. The bobbin case base 30 is a sewing machine that prevents needle breakage, characterized in that a guide fence 32 for guiding the needle 2 descending outside the inlet of the through hole 35 into the through hole 35 is installed. Rotary drum device. The method of claim 1, The guide fence 32 is a needle break, characterized in that formed by the fence portion 32a adjacent to the inlet side of the through hole 35 and the fastening portion 32b fixed to the main wall of the bobbin case base 30. Rotary book device of the sewing machine to be prevented. The method of claim 2, The fence part (32a) is a rotary drum device of the needle break is prevented, characterized in that the one end portion in the cross-section is formed as a curved portion introduced into the through hole (35). The method of claim 2, At least one fastening hole (h) is formed at the circumferential wall of the fastening portion 32b of the guide fence and the bobbin case base 30 corresponding to the guide fence, and needle breakage is prevented. Rotary book device of the sewing machine.

Images