KR200284416Y1 - Rotary shuttle device for sewing machine - Google Patents

Abstract

The present invention prevents idling of bobbins and bobbins of bobbins where the bobbin thread is wound by installing a spring on the bottom side of the bobbin cap holder, prevents sludge deposition on the spring mounting part, and prevents single yarn phenomena of the bobbin thread. The present invention relates to a rotating book device for a sewing machine to improve performance and to improve the quality of a sewing product.

The prior art having a leaf spring on the bobbin cap body side has problems such as a lower thread break due to bobbin compression of the leaf spring by sludge.

The present invention has a hook body mounted on a drive shaft rotatably connected by a power unit, a hook body accommodated in the hook body, a stud is placed on a bottom surface thereof, and a through space is formed, Bobbin cap holder (Bobbin Cap Holder) that is rotatably inserted, the bobbin that is stored in the bobbin cap holder and the bobbin wound around the bobbin, and fixed to the axial end of the barrel and having a flange having a base portion (Bobbin) And a bobbin cap body for accommodating the bobbin, wherein the spring is provided with a spring for elastically supporting the bobbin on the bottom surface side of the bobbin cap holder. As,

The spring forms a through hole for being inserted into the stud of the bobbin cap holder, and a standing end of a predetermined height inserted into the through space from the bottom surface of the bobbin cap holder, and in plan view with one end surface of the standing end, A base part integrally formed at both sides of the through-hole and having an inner space therethrough, and at one end in both inner spaces of the base part, one end is integrally connected to the base part, and the other end is formed on the inner space and bent in multiple stages. And a protrusion formed to protrude from the base portion is configured as a tangy piece for elastically supporting one point of the inclined portion of the flange of one side of the bobbin.

Description

Rotating book device for sewing machine {ROTARY SHUTTLE DEVICE FOR SEWING MACHINE}

The present invention relates to a rotating book device for a sewing machine, in particular, by installing a spring on the bottom side of the bobbin cap holder to prevent idle bobbin winding and sagging of the bobbin thread, as well as prevent sludge deposition on the spring mounting portion, bobbin thread The present invention relates to a rotating book device for sewing machine, which prevents single yarn from improving the performance of the sewing machine and improves the quality of the sewing product.

In general, embroidery, home or industrial sewing machines are provided with a rotary book device for supplying the lower thread as shown in Figure 1 an exploded perspective view thereof.

The rotary book device includes a hook body 2 mounted to a drive shaft 1 rotatably connected by a power unit, and a bobbin cap holder 3 housed in the hook body 2. And a bobbin 4 housed in the bobbin cap holder 3 and wound with a bobbin thread, and a bobbin cap body 5 for storing the bobbin 4.

Typically, the bobbin 4 has a staff cylindrical winding 4a on which a bobbin thread is wound, and flanges 4b and 4c fixed to both axial ends of the winding 4a, and the flanges 4b and 4c. ) Has a structure having a central portion of a predetermined thickness and an inclined portion 4bb (4cc) that becomes thinner gradually to the outer edge.

And the stud (3b) is installed in the bottom surface (3a) of the bobbin cap holder 3, the bobbin barrel (4a) is rotatably inserted into the stud (3b), the bottom surface (3a) The through space 3c is formed.

In addition, the bobbin cap body 5 is provided with a leaf spring 6 in contact with the bobbin 4.

The leaf spring 6 is in contact with the flange 4c of the bobbin 4 to hold the bobbin 4 elastically to prevent the bobbin from idling.

According to the configuration of the rotary book device, the hook body 2 and the bobbin cap holder 3 rotate relatively during sewing, and the bobbin lower thread is released and passes through the bobbin cap body 5 and passes through the hook body 2. The fabric is sewn onto the upper thread supplied from the upper part of the fabric to be sewn through).

However, such a conventional rotary book device for sewing machines appeared to cause some problems.

When the operating speed becomes uneven due to the replacement of the drum thread, idling occurs in the bobbin 4 and sagging and lumps are generated in the lower thread, and various types of sludge is deposited in the leaf spring 6 installed to prevent this. It is a problem.

That is, dust in the lower thread is generated in the bobbin storage space formed by the bobbin cap holder 3 and the bobbin cap body 5 when the bobbin 4 rotates, and lubricating oil is supplied to the hook body 2.

Therefore, the lubricating oil is vaporized into the bobbin storage space by the heat generated inside when the sewing machine is driven to form a sludge by agglomeration with the thread dust. The bobbin cap holder 3 has a through space 3C formed on the bottom surface thereof. As the air flow is actively made, the sludge is deposited toward the bobbin cap body 5, which is opposite to the through space of the bobbin cap holder, to the blocked bobbin cap body 5, and is deposited on the plate spring 6 mounting portion.

The leaf spring 6 has a thickness of about 0.1 mm, and the space in which the leaf spring is installed has a precise structure having a dimension such that a leaf spring of thin thickness can be installed.

Therefore, when the sludge is caught in the mounting portion of the leaf spring 6, the leaf spring is filled with a small space in which the leaf spring can move, and thus the leaf spring 6 is squeezed onto the bobbin, thereby preventing the bobbin from rotating. There was a problem.

The breakage of the lower thread generated during sewing, in particular, causes the defect of the product in high-quality clothes or embroidery, and causes various adverse effects such as loss of work due to interruption of work and deterioration of workability. there was.

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

An object of the present invention is by providing a spring for elastically supporting the bobbin on the bobbin cap holder bottom surface side having a through space,

A rotating drum device for sewing machines that prevents bobbins from being idled and prevents sludge deposition on spring-loaded parts, preventing breakage of the lower thread, minimizing product defects, and significantly improving the performance and workability of the sewing machine. In providing.

1 is an exploded perspective view showing the configuration of the prior art

Figure 2 is an exploded perspective view showing the configuration of an embodiment according to the present invention.

3 is a perspective view of a spring of one embodiment according to the present invention.

Figure 4 is a partially omitted detailed sectional view showing a mounting state of the spring according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: Drive Shaft 2: Hook Body

3: Bobbin Cap Holder

4: Bobbin 5: Bobbin Cap Body

6: leaf spring 20: spring according to the present invention

21: through hole 22: standing

23: base 24: interior space

25: bullet tip 25a: protrusion

26: protrusion

30: bobbin cap holder according to the present invention (Bobbin Cap Holder)

35: home

Rotating book device for a sewing machine according to the present invention to achieve the above object,

Hook body mounted on a drive shaft rotatably connected by a power unit, and a stud is housed in the hook body and a bottom is placed in the bottom surface, a through space is formed, and a bobbin tube, which will be described later, is rotatable on the stud. Bobbin cap holder (Bobbin Cap Holder), the bobbin which is stored in the bobbin cap holder and the bobbin wound around the bobbin thread and fixed to both ends of the axial direction of the barrel, and including a flange having a base portion (Bobbin), In the rotating book device for a sewing machine comprising a bobbin cap body for storing the bobbin,

A spring for elastically supporting the bobbin is provided on the bottom surface side of the bobbin cap holder.

As an embodiment of the present invention,

The spring forms a through hole for being inserted into the stud of the bobbin cap holder, and a standing end having a predetermined height inserted into the through space from the bottom surface of the bobbin cap holder;

A base part which is integrally formed with one end surface of the standing end and has an inner space therethrough;

In the inner space on both sides of the base portion, one end is integrally connected to the base portion, the other end is formed on the inner space, and the protrusions, which are formed in multiple stages and protrude from the base portion, have one point of inclination of one flange of the bobbin. Characterized in that it is composed of a tangy piece for elastic support.

As an embodiment of the present invention,

The base of the spring is formed by integrally forming the engaging projection at both ends,

The bobbin cap holder is characterized in that a groove for inserting the engaging projection of the spring is formed.

As an embodiment of the present invention,

Both ends of the spring base portion is formed as an arc end corresponding to the inner edge of the bobbin cap holder, it characterized in that the engaging projection is formed on both arc ends.

Hereinafter, an embodiment of a rotating book device for a sewing machine of the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing the configuration of a rotating drum device for an embodiment of the sewing machine according to the present invention, Figure 3 is a perspective view of a spring of one embodiment according to the present invention, Figure 4 is a part omitted showing the mounting state of Figure 3 Detailed cross section.

Rotating book device for a sewing machine of an embodiment according to the present invention, as shown in Figures 2 to 4,

Hook body (2) mounted to the drive shaft (1) rotatably connected by the power unit, and stored in the hook body (2), studs 32 are placed in the bottom surface 31, penetrating A space 33 is formed, and the stud 32 is housed in a bobbin cap holder 30 to which a bobbin barrel 4a, which will be described later, is rotatably inserted, and the bobbin cap holder 30. The bobbin 4 and the bobbin 4 which are fixed to the bobbin 4a by which a bobbin thread is wound, flanges 4b and 4c which are fixed to the both ends of the axial direction of this barrel 4a, and have a base part, It comprises a bobbin cap body (5) for storing, the spring 20 for elastically supporting the bobbin (4) is provided on the bottom surface 31 side of the bobbin cap holder (30) It is.

The bobbin 4 is configured to extend between both flanges 4b and 4c and wind the partition wall 4d in order to wind the lower thread more.

The spring 20 forms a through hole 21 to be inserted into the stud 32 of the bobbin cap holder 30, and is inserted into the through space 33 from the bottom surface 31 of the bobbin cap holder. With a standing mouth 22 of the height,

A base portion 23 integrally formed on both sides of the through hole 21 and having an inner space 24 therethrough, in plan view with one end surface of the standing end 22;

Protruding portions 25a which are integrally connected to the base portion 23 in one end and integrally formed on the inner space in both sides of the base portion 23 and are bent in multiple stages to protrude from the base portion 23. ) Is composed of a tungsten piece 25 for elastically supporting one point of the inclined portion 4bb of the flange 4b of the bobbin 4.

The tungsten pieces 25 on both sides were formed in a staggered direction.

The base portion 23 of the spring 20 is formed by integrally forming the locking projections 26 at both ends, and the bobbin cap holder 30 has a groove 35 for inserting the locking projections 26 of the spring. Formed to prevent the removal of the spring (20).

Both ends of the spring base 23 may be formed as arc ends 23a corresponding to the inner edge of the bobbin cap holder 30, and the locking projections 26 may be formed at both arc ends 23a. .

Both ends of the spring base 23 may be fixed by welding one point to the bobbin cap holder, respectively.

Look at the working state of the rotary book device for a sewing machine according to the present invention having such a configuration.

The present invention provides a spring 20 on the bottom surface 31 side of the bobbin cap holder 30 to prevent idling of the bobbin, one point of the inclined portion 4bb of the bobbin 4, the tangy piece 25 By holding symmetrically, the bobbin 4 has a structure in which the brake function for preventing idling is excellent while minimizing interference, and also prevents dust sludge from being deposited on the spring mounting portion.

That is, the spring 20 is in contact with the inclined portion belonging to the outer periphery of the flange, without interfering with the rotation of the bobbin, excellent brake efficiency,

The bottom surface 31 of the bobbin cap holder 30 to be installed forms a through space 33, and the air flows through the through space 33 when the sewing machine is driven, so that the bobbin 4 is accommodated. Seal dust sludge generated in the space formed by the cap holder 30 and the bobbin cap body 4 is collected inside the bobbin cap body 5 in the opposite direction in which the spring 20 is installed, and sludge is deposited on the spring 20. There is no fear of becoming.

In addition, the spring 20 is formed by welding or fixing the standing end 22 and the engaging projection 26 to prevent the removal, and further the elastic piece 25 which is in elastic contact with the flange base portion 4bb of the bobbin (5). ) Is formed by the bent projections (25a) is formed so that the contact surface is less to prevent the idling while minimizing interference in the normal rotation of the bobbin (4).

As described above, the rotary book device for the sewing machine according to the present invention provides the spring 20 to the bottom surface side of the bobbin cap holder 3 with active air flow, thereby preventing sludge from being caught in the spring mounting portion, thereby making the spring function smooth. As well as preventing the idle of the bobbin, it is to prevent the bobbin squeezing of the spring by the sludge and the resulting lower thread break due to the problem in the prior art.

The present invention can be variously substituted, modified and changed within the scope without departing from the technical spirit of the present invention for those skilled in the art to which the present invention belongs, it is limited to the above embodiments and drawings no.

As described in detail above, the rotary book device for a sewing machine according to the present invention,

By providing a spring for preventing the idle of the bobbin to the bottom surface side of the bobbin cap holder with active air circulation,

It prevents the thread dust sludge generated in the bobbin storage space from being caught in the spring mounting part, thereby preventing the single thread phenomenon of the lower thread, which is a problem of the prior art caused by the spring pressing the bobbin, to minimize the occurrence of defects of high-quality sewing products and at the same time the sewing machine It is a technology having the advantage of significantly improving the performance and workability of the.

Claims (4)

Hook body mounted on the drive shaft rotatably connected by a power unit, and the hook body is accommodated in the hook body and a stud is placed on the bottom surface and a through space is formed, and the bobbin tube described later is rotatably formed on the stud. Bobbin cap holder (Bobbin Cape Holder) to be inserted, the bobbin which is stored in the bobbin cap holder, the bobbin is wound around the bobbin and the flange is fixed to the axial end of the barrel and having a base portion; In the rotating book device for a sewing machine comprising a bobbin cap body for storing the bobbin, Rotating book device for a sewing machine, characterized in that a spring for elastically supporting the bobbin is provided on the bottom surface side of the bobbin cap holder. The method of claim 1, The spring is, A standing end having a predetermined height, forming a through hole for being inserted into the stud of the bobbin cap holder and being inserted into the through space from the bottom surface of the bobbin cap holder; A base part integrally formed at both sides of the through hole and having an inner space therethrough in plan view with one end surface of the mouth end; In the inner space on both sides of the base portion, one end is integrally connected to the base portion, the other end is formed on the inner space, and the protrusions, which are formed in multiple stages and protrude from the base portion, have one point of inclination of one flange of the bobbin. Rotating book device for a sewing machine, characterized in that consisting of a tangy piece for supporting elasticity. The method of claim 1, The base of the spring is formed by integrally forming the engaging projection at both ends, Rotating book device for a sewing machine, characterized in that the bobbin cap holder is formed with a groove for inserting the engaging projection of the spring. The method according to any one of claims 1 to 3, Both ends of the spring base portion is formed of an arc-shaped end corresponding to the inner edge of the bobbin cap holder, the locking book device for a sewing machine, characterized in that the engaging projection is formed on the both arc-shaped ends.