KR102665421B1 - Under thread supply device of sewing machine - Google Patents

Abstract

In the sewing machine lower thread supply device of the present invention, the lower thread (2) released from the large lower thread bobbin (80) mounted on one upper side of the sewing machine main body (1) is connected to the guide tube (30) by the air pressure difference without using a separate tool. Since the tension is adjusted quickly and continuously without frictional resistance along the inside of the hook body (40), when supplying the lower thread (2), the lower thread (2) is supplied due to frictional resistance due to the use of the tension control part of the existing lower thread (2) and the anti-sag ring. It has the advantage of preventing twisting and short-circuiting by eliminating the stress on the lower thread (2).

Description

Sewing machine lower thread supply device {UNDER THREAD SUPPLY DEVICE OF SEWING MACHINE}

The present invention relates to a sewing machine lower thread supply device, and more specifically, to a sewing machine lower thread supply device that can supply lower thread without limitation from an external large spool.

Generally, a sewing machine consists of an upper thread supply device that supplies upper thread and the needle moves vertically, and a lower thread supply device that supplies the upper thread supply device and lower thread and threads the upper thread and lower thread.

The lower thread supply device includes a hook body (outer whorl) that is fixed to the hook drive shaft and rotates, a housing (inner whorl) that is mounted inside the hook body (outer whorl) and is provided with a bobbin case fixing rod and is fixedly installed, and the housing It consists of a bobbin that is inserted into the bobbin case fixing rod of the inner whorl and has a lower thread wound thereon, and a bobbin case into which the bobbin is inserted and fixed to the frame.

In the lower thread supply device with the above configuration, the length of the thread wound around the bobbin is 50 to 80 m, and the lower thread must be changed by hand every 5 to 30 minutes at the shortest. Therefore, if the lower thread falls during sewing, a loose stitch occurs and the product is immediately defective. When sewing products in which joint stitching is not allowed, the lower thread must not fall during sewing, and defective products frequently occur, increasing the cost of raw materials and wasting manpower and time due to winding of the lower thread on the bobbin, work stoppage, and replacement of the lower thread. There was a problem in that productivity in the sewing and clothing industry decreased.

Therefore, in the past, as an alternative to the above problems, a device in which the lower thread is supplied from an external large spool has been proposed.

In other words, the external supply device for lower thread, which allows unlimited supply from large spools, is in high demand in industrial sites where industrial sewing machines are mainly used, and industrial sewing machines can produce 3,000 to 6,000 stitches per minute, that is, the hook and the hook drive shaft that drives the hook are sewn at 3,000 to 6,000 stitches per minute. Rotate at 3,000 to 6,000 high speeds.

The external lower thread supply device proposed so far creates a through hole inside a long hook drive shaft of 270 mm or more, inserts a long tube in proportion to the long hook drive shaft, and supplies external lower thread to the hook through the rear end of the inserted long pipe. As a device, the tube inserted into the long hook drive shaft rotating at high speed rotates with the hook drive shaft or has a high coefficient of friction, which reduces durability and when the connected thread breaks, the external lower thread is pulled and supplied through a small and long pipe using a tool. This resulted in a very difficult work process, and since tools from various devices were mixed at the rear end of the hook drive shaft, there was a problem that it was difficult to put it into practical use, despite the urgent need for a lower thread supply device without limitations from large external failures.

Republic of Korea Public Utility Model Publication No. 20-0298704 (2002.12.09.)

The purpose of the present invention was conceived in consideration of existing problems, and it is possible for workers to easily and without limitation supply lower thread from an external large lower thread bobbin to the inside of the hook body through air supply at a convenient location without using separate tools. The purpose is to provide a sewing machine lower thread supply device.

Another object of the present invention is to provide a sewing machine lower thread supply device that can easily supply fine oil to the hook body and power transmission means to increase durability by lubricating, preventing oxidation, preventing rust, preventing corrosion, and minimizing the coefficient of friction.

A sewing machine lower thread supply device according to an embodiment of the present invention for solving the above technical problem includes a work table supporting the sewing machine body to be seated on the upper portion; Front and rear drive shafts that are horizontally connected to the lower front and rear sides of the work table via a power transmission means and rotate simultaneously; a guide tube installed with a tolerance at the center of the front drive shaft and having a lower thread inlet at the rear end to supply lower thread to the front end of the front drive shaft between the front and rear drive shafts; a hook body fixed to the front end of the front drive shaft; a housing provided inside the hook body, the guide rod formed therein having a draw-out hole communicating with the guide pipe; and a bobbin case in which a cut groove is formed in a fixing tube coupled to the guide rod, wherein an air inlet is formed at a rear end of the guide tube at a predetermined interval rearward than the lower thread inlet.

As another embodiment, a lower thread insertion hole into which the lower thread is inserted from the outside is formed at the rear of one side of the sewing machine main body of the present invention, and the lower thread insertion hole is connected to the lower thread inlet and a guide pipe.

As another embodiment, the power transmission means of the present invention includes a case coupled to one lower side of the work table; Front and rear support walls installed at regular intervals within the case; an idle gear rotatably supported on an upper portion between the front and rear support walls via a rotation axis; a drive shaft support member disposed at the lower center between the front and rear support walls and rotatably supporting the rear end of the front drive shaft and the front end of the rear drive shaft, respectively; and a front gear and a rear gear respectively installed on one outer periphery of the rear end of the front drive shaft and one outer periphery of the front end of the rear drive shaft and connected to both ends of the idle gear by simultaneous gear engagement.

As another embodiment, the front and rear support walls of the present invention are characterized in that the front-to-back distance between the front and rear support walls is maintained by upper and lower support pins that are installed horizontally at regular intervals above and below.

As another embodiment, the drive shaft support member of the present invention is characterized in that the position is fixed by the lower support pin penetrating the lower part of the drive shaft support member.

As another embodiment, the drive shaft support member of the present invention is a front and rear wall connected at the top and open at the bottom to maintain a constant front and rear spacing, and the outer circumference of the rear end of the front drive shaft is rotatable on the outer wall of the front wall. It is connected to the rear wall, and the outer periphery of the tip of the rear drive shaft is rotatably connected to the outer wall of the rear wall.

As another embodiment, the outer wall surface of the front wall of the present invention and the outer periphery of the rear end of the front drive shaft are connected by a bearing or an oil bushing, and the outer wall surface of the rear wall and the outer periphery of the front end of the rear drive shaft are connected by a bearing or oil bushing. It is characterized by being

As another embodiment, the present invention is characterized in that a through hole is formed on one side of the front wall so that the rear end of the guide pipe penetrates from the outside to the inside of the front wall with the rotation center of the front drive shaft.

In another embodiment, the guide tube of the present invention is fixed to the front wall at the position of the through hole by a fixing screw.

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As another embodiment, the lower thread inlet and the air inlet of the present invention are bent at a right angle from the rear end of the guide tube and protrude out of the case.

In another embodiment, the air inlet of the present invention is connected to an air pump to supply air into the guide pipe.

As another embodiment, a fine oil supply port for supplying fine oil to the hook body and the power transmission means is installed on one side of the front drive shaft of the present invention through a tolerance between the front drive shaft and the guide tube. do.

As another embodiment, the micro-oil supply port of the present invention is characterized in that one or more screw-type regulators are installed.

In another embodiment, the micro-oil supply port of the present invention is characterized in that it is detachably connected to a micro-oil pump to supply micro-oil into the interior of the front drive shaft.

In the sewing machine lower thread supply device of the present invention, the lower thread released from the large lower thread bobbin mounted on one upper side of the sewing machine body is tensioned without frictional resistance along the inside of the guide pipe to the inside of the hook body by the air pressure difference without using a separate tool. Since this is adjusted and supplied quickly and continuously, there is an advantage in preventing twisting and short-circuiting by eliminating the stress on the lower thread caused by friction resistance due to the tension control part of the existing lower thread and the use of the anti-sagging ring when supplying the lower thread.

In addition, the sewing machine lower thread supply device of the present invention is configured to shorten the length of the existing drive shaft, which is a rotating chain, by separating the front drive shaft and the rear drive shaft as in the present invention, and is installed inside the hook body through a guide pipe installed with a tolerance within the front drive shaft. The tension can be adjusted quickly without frictional resistance due to the difference in air pressure flowing through the lower thread, so it is not only convenient to replace the lower thread, but also has the advantage of shortening the replacement time.

In addition, the sewing machine lower thread supply device of the present invention can easily and quickly supply fine oil to the hook body and power transmission means periodically through the fine oil supply port installed on one side of the front drive shaft, thereby lubricating and oxidizing the hook body and power transmission means. It has the advantage of increasing durability due to anti-rust, anti-corrosion, and minimization of friction coefficient.

1 is an exemplary diagram showing a sewing machine lower thread supply device according to the present invention;
Figure 2 is an illustration showing a power transmission means, front and rear drive means, and lower thread supply means according to the present invention;
Figure 3 is an exemplary diagram showing the combined state of the gears of the power transmission means and the front and rear drive means according to the present invention.

Hereinafter, in order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings FIGS. 1 to 3. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. It should be noted that the same configuration may be indicated by the same reference numeral in each drawing. Detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the gist of the present invention are omitted.

1 to 3, the sewing machine lower thread supply device according to an embodiment of the present invention includes a sewing machine body (1), a work table (10), a power transmission means (100), and front and rear drive shafts (20) (22). ), guide pipe (30), hook body (40), housing (50), and bobbin case (60).

That is, a lower thread insertion hole (3) is formed at the rear of one side of the sewing machine body (1) into which the lower thread (2) is inserted from the outside, and the lower thread insertion hole (3) is connected to the lower thread inlet (32) and a flexible guide pipe. It is connected by (70).

At this time, the guide pipe 70 is connected to the lower thread insertion hole 3 inside the sewing machine body 1 through the bottom of the sewing machine body 1 through the through hole 12 formed on one side of the work table 10. do.

The sewing machine body 1 is supported on the upper part of the work table 10, and the work table 10 includes front and rear drive shafts 20 and 22, a guide pipe 30, a hook body 40, and a housing at the bottom. (50), it serves to support the bobbin case (60), the power transmission means (100), etc.

The power transmission means 100 includes a case 200 coupled to one lower side of the work table 10; A front support wall 210 and a rear support wall 212 installed at regular intervals within the case 200; An idle gear 220 rotatably supported on an upper portion between the front support wall 210 and the rear support wall 212 via a rotation axis 218; A drive shaft support member 230 disposed at the lower center between the front support wall 210 and the rear support wall 212 and rotatably supporting the rear end of the front drive shaft 20 and the front end of the rear drive shaft 22, respectively. ; And a front gear 240 and a rear gear respectively installed on one outer circumference of the rear end of the front drive shaft 20 and one outer circumference of the front end of the rear drive shaft 22 and connected to both ends of the idle gear 220 by simultaneous gear engagement. Includes gear 242.

The front and rear support wall 210 and the rear support wall 212 are configured so that the front-to-back distance is maintained by the upper support pins 214 and lower support pins 216, which are installed horizontally at regular intervals above and below. desirable.

The drive shaft support member 230 is preferably configured to be fixed in position by a lower support pin 216 penetrating the lower part of the drive shaft support member 230.

The drive shaft support member 230 is a front wall 232 and a rear wall 234 that are connected at the top and open at the bottom to maintain a certain distance back and forth, and the front drive shaft 20 is located on the outer wall of the front wall 232. It is preferable to configure the outer circumference of the rear end to be rotatably connected, and the outer circumference of the front end of the rear drive shaft 22 to be rotatably connected to the outer wall of the rear wall 234.

The outer wall surface of the front wall 232 and the outer periphery of the rear end of the front drive shaft 20 are connected with a bearing or an oil bushing, and the outer wall surface of the rear wall 234 and the outer periphery of the front end of the rear drive shaft 22 are connected with a bearing or oil bushing. It is desirable to configure it to be connected to .

A through hole 236 is formed on one side of the front wall 232 so that the rear end of the guide pipe 30 penetrates from the outside to the inside of the front wall 232 around the rotation center of the front drive shaft 20.

The front and rear drive shafts 20 and 22 are preferably configured in the form of pipes that are horizontally connected to the lower front and rear sides of the work table 10 via a power transmission means 100 and rotate simultaneously.

On one side of the front drive shaft 20, there is a fine oil supply port 24 for supplying fine oil to the hook body 40 and the power transmission means 100 through the clearance between the front drive shaft 20 and the guide pipe 30. is installed.

At this time, it is preferable that one or more fine oil supply ports 24 are provided with a screw-type regulator, and the fine oil supply ports 24 are configured to supply fine oil into the inside of the front drive shaft 20. It is desirable to configure it to be detachably connected to the connection pipe 262 of the microoil pump 260.

The guide tube 30 is installed with a tolerance at the center within the front drive shaft 20, and supplies the lower thread 2 to the front end of the front drive shaft 20 between the front drive shaft 20 and the rear drive shaft 22. It is desirable to configure it in the form of a tube forming a lower thread inlet 32 and an air inlet 34.

At this time, the guide tube 30 is preferably fixed so as not to rotate by the front wall 232 and the fixing screw 92 at the position of the through hole 236.

It is preferable that the air inlet 34 is formed at the rear end of the guide pipe 30 at a certain distance behind the lower thread inlet 32.

It is preferable that the lower thread inlet 32 and the air inlet 34 are bent at a right angle from the rear end of the guide tube 30 and protrude out of the case 200.

The air inlet 34 is preferably connected to the air pump 250 and the connection pipe 252 to supply air into the guide pipe 30.

The hook body 40 is fixed to the tip of the front drive shaft 20.

The housing 50 is provided inside the hook body 40, and the guide rod 51 formed inside is provided with an outlet hole 52 that communicates with the guide pipe 30.

The bobbin case 60 has a cut groove 62 formed in the fixing tube 61 coupled to the guide rod 51.

The lower thread (2) is released from the large lower thread bobbin (80) mounted on one upper side of the sewing machine body (1) and is inserted into the lower thread insertion hole (3) formed at the rear of the middle height of the sewing machine body (1) to maintain a predetermined tension. After insertion, it is guided into the inside of the guide pipe (30) through the guide pipe (70) connecting the lower thread insertion hole (3) and the seal inlet (32) and supplied through the housing (50) and the bobbin case (60). As the rotation of the guide pipe 30 is blocked, twisting and short-circuiting of the lower thread 2 that passes through the guide pipe 30 and is supplied to the draw hole 52 is prevented.

At this time, when the end of the lower thread (2) released from the large lower thread bobbin (80) is pushed into the guide pipe (70), the air generated by the operation of the air pump (250) flows into the air inlet (34) to guide the lower thread (2). The air flowing out through the outlet hole 52 formed in the guide rod 51 connected to the tube 30 is sucked into the guide tube 70 by a pressure difference, and the lower thread inlet 32 is opened along the direction of the air flow. It reaches the inside of the hook body 40.

In this way, in the sewing machine lower thread supply device of the present invention, the lower thread (2) released from the large lower thread bobbin (80) mounted on one upper side of the sewing machine main body (1) is moved through the guide pipe by the air pressure difference without using a separate tool. Because the tension is controlled and supplied quickly and continuously along the inside of the hook body (40) without frictional resistance along the inside of (30), when supplying the lower thread (2), friction is caused by using the tension control part of the existing lower thread (2) and the anti-sagging ring. It has the advantage of preventing twisting and short-circuiting by eliminating the stress on the lower thread (2) caused by resistance.

In addition, the sewing machine bobbin thread supply device of the present invention is configured to shorten the length of the existing drive shaft, which is a rotating body, by separating the front drive shaft 20 and the rear drive shaft 22 as in the present invention, and a tolerance is left within the front drive shaft 20. Because the tension can be adjusted and supplied quickly without frictional resistance due to the air pressure difference that flows through the lower thread (2) through the installed guide pipe (30) to the inside of the hook body (40), it is not only convenient to replace the lower thread (2), but also reduces the replacement time. There is an advantage in being able to shorten .

In addition, the sewing machine lower thread supply device of the present invention can easily and quickly supply fine oil to the hook body 40 and the power transmission means 100 periodically through the fine oil supply port 24 installed on one side of the front drive shaft 20. Therefore, there is an advantage of increasing durability due to lubrication, oxidation prevention, rust prevention, corrosion prevention, and friction coefficient minimization of the hook body 40 and the power transmission means 100.

Meanwhile, the present invention is not limited to the above-described embodiments, but can be implemented with modifications and modifications without departing from the gist of the present invention, and the technical idea to which such modifications and modifications are applied also falls within the scope of the following patent claims. Must see.

1: Sewing machine body 2: Lower thread
3: Lower thread insertion hole 10: Work table
12: Through hole 20: Front drive shaft
22: rear drive shaft 24: fine oil supply port
30: Guide pipe 32: Lower thread inlet
34: air inlet 40: hook body
50: Housing 51: Guide rod
52: Drawout hole 60: Bobbin case
61: fixation tube 62: incision groove
70: Guide pipe 80: Large lower thread bobbin
90: Bearing 92: Fixing screw
100: Power transmission means 200: Case
210: front support wall 212: right support wall
214: upper support pin 216: lower support pin
218: rotation axis 220: idle gear
230: Drive shaft support member 232: Front wall
234: rear wall 236: through hole
240: front gear 242: rear gear
250: air pump 252: connector
260: fine oil pump 262: connector

Claims (15)

A work table (10) that supports the sewing machine body (1) to be seated at the top;
Front and rear drive shafts 20 and 22 are horizontally connected to the lower front and rear sides of the work table 10 via a power transmission means 100 and rotate simultaneously;
It is installed with a tolerance at the center within the front drive shaft 20, and has a lower thread inlet at the rear end to supply the bobbin thread 2 to the front end of the front drive shaft 20 between the front drive shaft 20 and the rear drive shaft 22. 32) is formed by a guide pipe (30);
A hook body 40 fixed to the front end of the front drive shaft 20;
A housing 50 provided inside the hook body 40 and having an outlet hole 52 communicating with the guide pipe 30 on a guide rod 51 formed therein; and
It includes a bobbin case 60 in which a cut groove 62 is formed in the fixing tube 61 coupled to the guide rod 51,
A sewing machine lower thread supply device, characterized in that an air inlet 34 is formed at a rear end of the guide pipe 30 at a certain interval rearward than the lower thread inlet 32. In claim 1,
A lower thread insertion hole (3) is formed at the rear of one side of the sewing machine body (1) into which the lower thread (2) is inserted from the outside,
A sewing machine lower thread supply device, characterized in that the lower thread insertion hole (3) is connected to the lower thread inlet (32) and a guide pipe (70). In claim 2,
The power transmission means 100 is,
A case 200 coupled to one lower side of the work table 10;
A front support wall 210 and a rear support wall 212 installed at regular intervals within the case 200;
An idle gear 220 rotatably supported on an upper portion between the front support wall 210 and the rear support wall 212 via a rotation axis 218;
A drive shaft support member 230 disposed at the lower center between the front support wall 210 and the rear support wall 212 and rotatably supporting the rear end of the front drive shaft 20 and the front end of the rear drive shaft 22, respectively. ; and
A front gear 240 and a rear gear respectively installed on one outer circumference of the rear end of the front drive shaft 20 and one outer circumference of the front end of the rear drive shaft 22 and connected to both ends of the idle gear 220 by simultaneous gear engagement. Sewing machine lower thread supply device comprising (242). In claim 3,
The front-to-back distance between the front support wall 210 and the rear support wall 212 is maintained by upper and lower support pins 214 and 216, which are installed horizontally at regular intervals above and below. Sewing machine lower thread supply device. In claim 4,
The drive shaft support member 230 is a sewing machine bobbin thread supply device, characterized in that the position is fixed by the lower support pin 216 that penetrates the lower part of the drive shaft support member 230. In claim 5,
The drive shaft support member 230 is a front wall 232 and a rear wall 234 that are connected at the top and open at the bottom to maintain a certain distance back and forth,
The outer circumference of the rear end of the front drive shaft 20 is rotatably connected to the outer wall of the front wall 232,
A sewing machine bobbin thread supply device, characterized in that the outer circumference of the tip of the rear drive shaft (22) is rotatably connected to the outer wall of the rear wall (234). In claim 6,
The outer wall surface of the front wall 232 and the outer periphery of the rear end of the front drive shaft 20 are connected with a bearing or oil bushing,
A sewing machine lower thread supply device, characterized in that the outer wall surface of the rear wall 234 and the outer circumference of the tip of the rear drive shaft 22 are connected to each other by a bearing or an oil bushing. In claim 6,
On one side of the front wall 232, a through hole 236 is formed so that the rear end of the guide pipe 30 penetrates from the outside to the inside of the front wall 232 around the rotation center of the front drive shaft 20. Characterized by a sewing machine lower thread supply device. In claim 8,
The guide pipe (30) is fixed to the front wall (232) and the fixing screw (92) at the position of the through hole (236). delete In claim 3,
The lower thread inlet 32 and the air inlet 34 are bent at a right angle from the rear end of the guide tube 30 and protrude to the outside of the case 200. In claim 3,
The air inlet 34 is connected to an air pump 250 to supply air into the guide tube 30. In claim 3,
On one side of the front drive shaft 20, a fine oil supply is provided to supply fine oil to the hook body 40 and the power transmission means 100 through the tolerance between the front drive shaft 20 and the guide tube 30. Sewing machine lower thread supply device, characterized in that the sphere (24) is installed. In claim 13,
A sewing machine lower thread supply device, characterized in that one or more fine oil supply ports (24) are installed with a screw-type adjuster. In claim 14,
The fine oil supply port 24 is a sewing machine lower thread supply device, characterized in that it is detachably connected to the fine oil pump 260 to supply fine oil into the interior of the front drive shaft 20.

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