Bobbin thread continuous feeder

Abstract

To provide a bobbin thread continuous feeder capable of preventing a needle thread 12 from entangling with a bobbin thread 13 in a clearance 10 between a rotating hook 2 and a shuttle body 3 when the bobbin thread 13 is introduced into the shuttle body 3 from the outside of the rotating hook 2.SOLUTION: The invention solves a problem of causing a needle thread 12 to entangle with a bobbin thread 13 (a bobbin thread introduction tube 5) by: fitting a bobbin thread feeder 8, in which a joint 6 and the bobbin thread introduction tube 5(2) are fitted to a bobbin thread feeder frame 8(1), to a shuttle body 3; changing a clearance 10 between a rotating hook 2 and the shuttle body 3 to the inside of the bobbin thread feeder 8; and blocking an opposite space 2k between a rotating hook two-pointed root part 2i and a shuttle body pressing root part 2j, thereby, preventing a needle thread 12 from entering into the opposite space 2k.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] In a conventional sewing machine, a bobbin wound with a lower thread 13 is set in the inner hook, and the lower thread 13 is pulled out to the bobbin case thread outlet 4c. The upper thread 12 is caught by the tip of the outer hook 2 and made into a loop, with one end passing outside the outer hook 2. The other end passes through the gap 10 between the outer hook 2 and the inner hook 3. The continuous lower thread supplying device of the present invention does not have a bobbin. The upper thread 12 is caught by the tip of the outer hook 2 and formed into a loop, with one end passing outside the outer hook 2. The other end passes through the gap 10 between the outer hook 2 and the inner hook 3. In order to introduce the lower thread 13 from the outside of the outer hook 2 into the inner hook 3, it must pass through the gap 10 between the outer hook 2 and the inner hook 3. Because the lower thread 13 is stretched within the gap 10 between the outer hook 2 and the inner hook 3, the upper thread 12 and the lower thread 13 will cross and become tangled. The present invention should resolve this entanglement. [Background technology]

[0002] Generally, the principle of sewing fabric with thread using a sewing machine is as follows.

[0003] The needle with the needle thread 12 moves up and down through the fabric.

[0004] While the needle is lowered below the fabric, the needle thread 12 is loosened to make a loop, and the tip of the outer hook 2 is inserted into the loop part by the rotational movement of the outer hook 2, so that the loop part rotates together with the rotation of the outer hook 2.

[0005] The outer hook 2 is further rotated, and the loop portion of the upper thread 12 is passed around the bobbin held inside the outer hook 2 (the loop portion of the upper thread 12 passes through the bobbin), thereby crossing the lower thread 13 held by the bobbin with the upper thread 12.

[0006] The needle is raised and the upper thread 12 is pulled upwards with a firm pull, lifting the crossed bobbin thread 13 to form a stitch.

[0007] After one stitch is completed, the needle moves up while the fabric is fed forward one stitch at a time. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 5-337274 [Patent Document 2] Japanese Patent Application Publication No. 8-257282 [Patent Document 3] Japanese Patent Application Publication No. 9-327586 [Patent Document 4] Japanese Patent Application Publication No. 9-294888 [Patent Document 5] Japanese Patent Application Publication No. 2022-110999 Summary of the Invention [Problem to be solved by the invention]

[0009] The continuous bobbin thread supply device introduces the bobbin thread 13 from the outside of the outer hook 2 into the inside of the inner hook 3. In this case, it is necessary to solve the problem of the upper thread 12 becoming entangled with the bobbin thread 13 in the gap 10 between the outer hook 2 and the inner hook 3.

[0010] Therefore, in the present invention, a bobbin thread feeder 8 having a joint 6 and a bobbin thread introduction tube 5(2) attached to a bobbin thread feeder frame 8(1) is attached to the inner hook 3, and the opposing space 2k between the outer hook two blade tip base portion 2i and the inner hook retainer base portion 2j is blocked, preventing the upper thread 12 from entering the opposing space 2k, thereby solving the problem of the upper thread 12 becoming entangled with the bobbin thread 13 "bobbin thread introduction tube 5(2)" in the gap 10 between the outer hook 2 and the inner hook 3. [Means for solving the problem]

[0011] Referring to FIG. 8, in order to achieve the above object, the lower thread feeder 8 of claim 1 is provided with a joint 6 and a lower thread introduction tube 5(2) in a lower thread feeder frame 8(1).

[0012] Referring to FIG. 8, the lower thread feeder frame 8(1) is made of the same material as that of the shuttle. The shape of the bobbin thread feeder frame 8(1) is shown in Figure 3. It is designed and precisely machined so that when the shuttle is assembled, the side surface 8b of the bobbin thread feeder and the inner surface 2f of the outer shuttle are in contact with each other without any gaps when the bobbin thread feeder 8 is attached to the bobbin thread feeder attachment groove 3i cut into the guide rail 3f on the side of the inner shuttle and the attachment groove 3h of the bobbin thread guide tube 5(2). See Figure 2. The side surface 8b of the bobbin thread feeder forms a wall in the opposing space 2k between the roots 2i of the two blade tips of the outer shuttle and the roots 2j of the inner shuttle holder, sealing off the opposing space 2k and preventing the upper thread 12 from entering the opposing space 2k. When the side surface 8b of the lower thread feeder and the inner surface 2f of the outer hook are not in contact and the opposing space 2k is not blocked but open, the side surface 8b of the lower thread feeder is attached to the guide rail 3i of the inner hook side surface and is installed in the opposing space 2k (the lower thread 13 is stretched in the opposing space 2k), and as the outer hook 2 rotates, the upper thread 12 enters the opposing space 2k, passes under the side surface 8b of the lower thread feeder, and becomes tangled without being able to straddle the side surface 8b of the lower thread feeder.

[0013] Referring to FIG. 5, the bobbin thread guide tube 5 includes a tube 5(1) for the outside of the shuttle and a tube 5(2) for the inside of the shuttle. The material of the external bobbin thread introduction tube 5(1) is one that can withstand the rotational force of the rotary shaft 1 when the bobbin thread introduction tube 5(1) is attached to the bobbin thread introduction tube mounting frame 7, and that can firmly support the bobbin thread feeder 8 together with the joint 6. A screw thread 5d is cut into the thread outlet 5b of the bobbin thread introduction tube 5(1), and is screwed into the screw thread 5d cut into the thread inlet 6c of the joint shaft to connect. The internal bobbin thread guide tube 5(2) is made into a plate shape and is made of the same material as the hook. The thread passing hole of the lower thread introduction tube 5 is polished so that the thread does not break and the thread passes smoothly. The exterior is polished to remove the corners and make it round.

[0014] See Figure 6. The material of the joint is the same as that of the hook. The thread hole is polished to prevent thread breakage and allow for smooth thread passage. A screw thread 5d is cut into the coupling shaft inlet 6c.

[0015] FIG. 8 is a diagram showing the completed lower thread feeder 8. The vertical shaft portion of the joint shaft 6a is inserted into the insertion hole 8c for the joint shaft 6a formed in the bottom portion 8a of the lower thread feeder frame, and the horizontal shaft portion is attached to the bottom portion 8a of the lower thread feeder frame with a screw 9. The joint thread outlet shaft 6d is inserted into the thread inlet 5a of the lower thread introduction tube 5(2), and the thread outlet shaft 5c of the lower thread introduction tube 5(2) is attached by welding from the bottom 8a of the lower thread feeder frame to the side surface 8d of the lower thread feeder frame. The welded portion is ground so that the upper thread 12 does not get caught on the bobbin thread guide tube 5(2) inside the bobbin thread feeder 8 and break. The welded portion between the inner surface 2f of the outer hook and the side surface 8b of the bobbin thread feeder frame, and the welded portion between the bottom 2c of the outer hook and the bottom 8a of the bobbin thread feeder are ground so that the outer hook 2 rotates smoothly.

[0016] In order to achieve the above object, the continuous bobbin thread supply device of claim 2 is composed of a rotating shaft 1, an outer hook 2, an inner hook 3, a bobbin case 4, a bobbin thread introduction tube 5, a joint 6, a bobbin thread introduction tube mounting frame 7, and a bobbin thread supply device 8.

[0017] As shown in Figure 1, the shaft I is made of an iron bar with a hole for inserting the bobbin thread guide tube. The material is the same as that of the shaft 1 attached to the sewing machine.

[0018] As shown in FIG. 2, the outer hook 2 is the same as that used conventionally.

[0019] As shown in FIG. 3, the inner hook 3 is the same as that used conventionally. The thread outlet shaft 5c of the lower thread introduction tube 5(2) attached to the lower thread feeder 8 is firmly attached with a screw 9 to a recess 3h dug in the inner hook 3. To prevent the lower thread introduction tube 5(2) from contacting the outer surface 3g of the inner hook and interfering with the rotation of the outer hook 2, a groove 3i for attaching the lower thread feeder 8 is cut from the inner hook surface guide rail notch 3f(1) to 3f(2), and a recess 3h is dug at the end of 3f(1) to insert and attach the lower thread introduction tube thread outlet shaft 5c. The side surface 8b of the lower thread feeder and the inner surface 2f of the outer hook are designed to come into contact when the hook is assembled, and the groove 3i is precisely machined to ensure contact without any gaps. The side surface of the lower part of the guide rail 3f on the side of the inner hook is scraped off so that the outer hook 2 can rotate smoothly when the lower thread feeder 8 is attached to the inner hook 3. The central shaft 3a of the hook is attached to the central shaft mounting frame 3c.

[0020] As shown in Figure 4, the insertion space 4b for the lower thread introduction tube 5(2) is opened in a position that matches the thread outlet of the lower thread introduction tube 5(2) attached to the inner hook 3. An iron plate 4f with a thread passage hole is attached to the bobbin case central shaft 4a with screws.

[0021] As shown in Figure 5, a thread is cut into the thread outlet 5b of the lower thread guide tube 5(1). The thread inlet 5a is bent upward so that it projects above the sewing machine table. The lower thread guide tube 5(2) is machined into a plate shape, and the thread outlet shaft 5c is attached with a screw to the mounting recess in the inner hook. A large insertion opening is made in the thread inlet 5a of the lower thread guide tube 5(2) so that the coupling shaft thread outlet 6d can be inserted. The part of the thread outlet 5b of the lower thread guide tube 5(2) that enters the bobbin case from the inner hook is machined into a rounded shape.

[0022] As shown in Figure 6, threads are cut into the joint shaft thread inlet 6c. The joint shaft thread outlet 6d is machined into a plate shape and inserted into the thread inlet 5a of the bobbin thread introduction tube 5(2), and attached to the bottom part 8a of the bobbin thread feeder frame with screws.

[0023] As shown in Figure 7, the mounting frame 7 for the bobbin thread guide tube 5(2) is attached to the bottom of the sewing machine with screws. The bobbin thread guide tube 5(1) is passed through the tube of the mounting frame 7 and secured with a screw 9, firmly supporting the bobbin thread feeder 8.

[0024] Referring to Figure 8, the bobbin thread feeder 8, which has the bobbin thread introduction tube 5(2) and joint 6 attached to the bobbin thread feeder frame 8(1) by welding, is attached by cutting an attachment groove 3i on the side surface 8b of the bobbin thread feeder in the side surface guide rail 3f of the inner hook and inserting the upper edge of the side surface 8b of the bobbin thread feeder into the groove 3i. The bobbin thread introduction tube 5(2) thread outlet shaft 5c is attached with a screw 9 to the bobbin thread introduction tube 5(2) attachment recess 3h dug at the end of the cutout portion 3f(1) of the side surface guide rail of the inner hook. The lower thread feeder 8 is attached to the inner hook side guide rail 3f, and the opposing space 2k between the outer hook two blade tip root part 2i and the inner hook presser root part 2j is completely closed. A wall is formed between the inner hook side guide rail notches 3f(1) and 3f(2), and a gap 11 is formed between the outer surface 3g of the inner hook and the side surface 8b of the lower thread feeder. The bobbin thread feeder side surface 8b and the inner surface 2f of the outer hook are designed to come into contact when the hook is assembled, and the bobbin thread feeder mounting groove 3i and the bobbin thread guide tube 5(2) mounting recess 3h are precisely machined so that there is no gap when the bobbin thread feeder 8 is attached. A wall is created in the opposing space 2k between the outer hook double blade tip base 2i and the inner hook retainer base 2j, sealing off the opposing space 2k and preventing the upper thread 12 from entering into the opposing space 2k. A gap 11 is formed between the bobbin thread feeder 8 and the outer surface 3g of the inner hook. Therefore, the lower thread introduction tube 5(2) is connected to the joint 6 and attached to the lower thread feeder frame 8(1) by welding, and is located inside the lower thread feeder 8, and the upper thread 12 passes through the upper part of the lower thread introduction tube 5(2) "lower thread 13" (the upper thread loop portion passes through the lower thread feeder 8), and passes through the inside of the lower thread feeder 8 without becoming entangled in the lower thread introduction tube 5(2) "lower thread 13".

[0025] In order to achieve the above object, the mechanism of the continuous bobbin thread supplying device according to claim 2 is as follows: Referring to FIG. 9, the rotary shaft 1, the bobbin thread guide tube 5(1), and the bobbin thread guide tube mounting frame 7 constitute the outside of the hook. a bobbin thread feeder 8 that closes the opposing space 2k between the outer hook two blade tip root portion 2i and the inner hook holder root portion 2j, introduces the bobbin thread 2 from the outside of the hook into the inside of the hook, passes it through a thread passing hole 4f opened in an iron plate attached to the bobbin case central shaft 4a, and draws it out to the bobbin case thread outlet 4c; A groove 3i for mounting the bobbin thread feeder 8 is cut in the notches 3f(1) and 3f(2) of the guide rail on the side of the inner hook, a mounting recess 3h for the bobbin thread introduction tube thread outlet shaft 5c is dug, an insertion space 4b for the bobbin thread introduction tube 5(2) is provided on the side of the inner hook 3 and the bobbin case, and an iron plate with a thread passage hole 4f opened in the central shaft 4a is attached to the bobbin case 4, It consists of four parts:

[0026] As shown in Figure 9, assemble the continuous bobbin thread supply device. 1. Attach the bobbin thread feeder 8 to the inner hook 3. The upper edge of the side surface 8b of the bobbin thread feeder is inserted into the groove 3i cut in the inner hook side guide rail 3f, and the bobbin thread introduction tube thread outlet shaft 5c is placed in the recess 3h and fastened with the screw 9. 2. Insert the inner hook side guide rail 3f into the outer hook side guide rail groove 2e, hold the inner hook side guide rail 3f with the inner hook holder 2b, and attach the inner hook holder 2b to the outer hook 2 with the screws 9 to assemble the hook. 3. When the shuttle is assembled, the side surface 8b of the lower thread feeder is in contact with the inner surface 2f of the outer shuttle. The lower thread feeder 8 forms a wall in the opposing space 2k between the outer hook double blade tip root part 2i and the inner hook holder root part 2j, blocks the opposing space 2k, and forms a gap 11 between the inner hook outer side surface 3g and the lower thread feeder side surface 8b, thereby preventing the upper thread 12 from entering the opposing space 2k. 4. When the two blade tips 2a of the outer hook catch the upper thread 12, if the bobbin thread feeder 8 and the inner side surface 2f of the outer hook are not in contact and the opposing space 2k between the root part 2i of the two blade tips of the outer hook and the root part 2j of the inner hook holder is open, the upper thread 12 will enter the opposing space 2k between the root part 2i of the two blade tips of the outer hook and the root part 2j of the inner hook holder, and since the bobbin thread feeder 8 is attached to the opposing space 2k, it will enter below the side surface 8b of the bobbin thread feeder and will not be able to cross over the side surface 8b of the bobbin thread feeder attached to the groove 3i and recess 3h cut in the inner hook side guide rail 3f and the bobbin thread guide tube thread outlet shaft 5c (the lube part of the upper thread cannot pass through the bobbin thread feeder 8), and will become entangled with the side surface 8b of the bobbin thread feeder and the bobbin thread guide tube 5(2). Therefore, the lower thread feeder 8 and the inner surface 2f of the outer hook must be in contact with each other to prevent the upper thread 12 from entering the opposing space 2k. 5. Pass the bobbin thread introduction tube 5(1) through the thread passage hole of the rotary shaft 1 attached to the bottom of the sewing machine, and screw the bobbin thread introduction tube thread outlet 5b into the joint shaft thread inlet 6c protruding from the bottom 8a of the bobbin thread supplier 8. 6. Insert the rotary shaft 1 attached to the bottom of the sewing machine into the outer hook shaft 2d and secure it with the screw 9 to install it. 7. The bobbin thread introduction tube thread inlet 5a coming out of the rotary shaft 1 is passed through the mounting hole of the bobbin thread introduction tube mounting frame 7 attached to the bottom of the sewing machine, and fastened with a screw 9. 8. The bobbin thread introduction tube thread outlet shaft 5c attached to the recess 3g cut in the inner hook side guide rail 3f is inserted into the bobbin case 4 from the inside of the inner hook 3.

[0027] A bobbin thread feeder 8 is attached to the inner hook 3 and sewing work is performed. 1. When the shuttle is assembled, the lower thread feeder 8 comes into contact with the inner surface 2f of the outer shuttle double-bladed tip base portion 2i and the inner surface 2f of the inner shuttle retainer base portion 2j, forming a wall to close the opposing space 2k between the outer shuttle double-bladed tip base portion 2i and the inner shuttle retainer base portion 2j, thereby preventing the upper thread from entering the opposing space 2k. 2. To thread the bobbin thread, pass the bobbin thread 13 from outside the shuttle through the bobbin thread guide tube 5(1), then through the joint 6 attached to the bobbin thread feeder 8 and the bobbin thread guide tube 5(2), introduce it into the inner shuttle, pass it through the thread hole 4f opened in the iron plate attached to the bobbin case central shaft 4a, pull it out to the bobbin case thread outlet 4c, and pass it through the needle hole in the needle plate. The bobbin thread 13 is stretched in the space between the bobbin case thread outlet 4c and the needle hole in the needle plate. 3. The needle carrying the upper thread 12 penetrates the fabric and moves downward. While the needle is lowered below the fabric, the upper thread is loosened and made into a loop. The two blade tips 2a of the outer hook 2 are inserted into this looped part by the rotation of the outer hook 2, and the looped part rotates around the inner hook 3 along with the rotation of the outer hook 2. 4. The outer hook 2 is rotated so that one loop of the needle thread passes outside the hook and the other loop passes inside the bobbin thread feeder 8. 5. One end of the needle thread loop moving outside the hook passes under the bobbin thread 13 stretched in the space between the bobbin case thread outlet 4c and the needle hole in the needle plate. 6. One of the upper thread loops moving inside the lower thread feeder 8 cannot enter the opposing space 2k because the lower thread feeder 8 is in contact with the inner surface 2f of the outer hook, but enters the inside of the lower thread feeder 8 through the gap 11 between the outer surface 3g of the inner hook and the lower thread feeder 8, passes over the upper part of the lower thread introduction tube 5(2), and moves inside the lower thread feeder 8. 7. The outer hook 2 continues to rotate and descend, and one of the needle thread lubes moving around the outside of the hook crosses the head of the inner hook central shaft 3a at its lowest point, and the upper thread 12 crosses the bobbin thread 13 stretched in the space between the bobbin case thread outlet 4c and the needle hole in the needle plate, and the needle begins to rise. 8, the other end of the upper thread lube moving inside the lower thread feeder 8 crosses over the head 6e of the joint 6 attached to the lower thread feeder 8 at the lowest point without becoming entangled in the lower thread introduction tube 5(2) (the looped portion of the upper thread passes through the lower thread feeder 8), and the needle begins to rise. 9. The outer hook 2 rotates further, unifying the upper thread loop, raising the needle, pulling the upper thread 12 upward strongly, holding the crossed bobbin thread 13 inside the loop and lifting it up into the needle hole in the needle plate to form a stitch. 10. Once one stitch is completed, feed the fabric forward one stitch at a time while the needle is rising. [Effects of the Invention]

[0028] Because the bobbin thread can be supplied continuously, workers can work without worrying about running out of bobbin thread, which reduces mental fatigue, increases production capacity, and enables quick response to changes in work. [Brief explanation of the drawings]

[0029] [Figure 1] An example of a rotating axis 1 using an iron bar. [Figure 2] 1 is an example of a conventionally used outer pot 2. [Figure 3] 1 is an example of an inner hook 3 in which a mounting groove 3i for the bobbin thread feeder 8 is cut into the inner hook side guide rail 3f, a mounting recess 3h for the thread outlet shaft 5c of the bobbin thread introduction tube 5(2) is dug, and the side of the lower part of the inner hook side guide rail 3f is scraped off. [Figure 4] 2. An example of a bobbin case with a space for inserting the bobbin thread guide tube 5(2) on the side of the bobbin case and an iron plate with a thread hole attached to the central axis 4a. [Figure 5] 1 is an example of the lower thread introduction tube 5 (1) and 5 (2) that introduce the lower thread from the outside of the outer hook to the inside of the inner hook. [Figure 6] , an example diagram of joint 6. [Figure 7] 1 is an example of a bobbin thread guide tube mounting frame 7 attached to the bottom of a sewing machine with a screw 9. [Figure 8] 2 is a diagram illustrating an example of a lower thread feeder 8. FIG. [Figure 9] ,An example of the mechanism of the upper hook. [Figure 10] ,Model Figure A [Figure 11] , Model diagram B [Figure 12] , Model diagram C [Figure 13] , Model Diagram D [Figure 14] ,Model Figure E DETAILED DESCRIPTION OF THE INVENTION

[0030] The method of carrying out the present invention will be explained by way of a model example. [Example]

[0031] Make a model of a continuous bobbin thread supply device. The mounting recess 3h for the lower thread introduction pipe 5(2), the mounting groove 3i for the lower thread feeder and the joint 6 are not machined or produced because there is no machine tool for machining them. To allow the outer hook 2 to rotate smoothly, the side of the lower part of the inner hook side guide rail 3f is ground off with a grinder. Build a model. See Figure A. 1. Drill a needle hole in the table, attach the rotating shaft mounting frame to the bottom of the table, and attach the threading frame to the top of the table. 2. Attach the rotating shaft to the rotating shaft mounting frame. 3. A gear is installed to prevent the rotating shaft from coming out of the rotating shaft mounting frame. 4. The thread outlet 5b of the lower thread introduction tube 5(1) is passed through the rotary shaft and connected to the thread inlet 5a of the lower thread introduction tube 5(2) attached to the lower thread feeder 8 at the bottom 2c of the outer hook. 5. The thread outlet 5b of the bobbin thread introduction tube 5(2) passes through the inside of the shuttle hook from the bottom of the guide rail 3f on the side of the shuttle hook and enters the bobbin case. 6. Bring the thread inlet 5a of the bobbin thread guide tube 5(1) above the table and attach it to the threading frame. 7. The lower thread introduction tube 5(1) is attached to the bottom of the table by the lower thread introduction tube attachment frame 7, and the lower thread feeder 8 is made stationary. 8. Attach the kettle to the rotating shaft. 9. Do not install the inner kettle stopper and fittings. The materials used are: The hook is a hook for a lock stitch sewing machine. The radius of the bottom of the outer hook is about 12 mm, and the height from the bottom of the outer hook to the guide rail on the side of the outer hook is about 5 mm. The rotating shaft is made of aluminum pipe. The lower thread guide tube 5(1) is made of copper pipe. The material for the bobbin thread feeder 8 and the bobbin thread guide tube 5(2) was a cup ramen lid.

[0032] Nakakama 3 is The lower side of the inner hook side guide rail 3f is cut away to remove the gap 10 between the outer hook 2 and the inner hook 3 so that the outer hook 2 can rotate smoothly around the inner hook 3. Also, as shown in Fig. E, when the bobbin thread feeder 8 is attached to the inner hook side guide rail 3f, the inside of the hook becomes the inside of the bobbin thread feeder 8. The opposing space 2k between the outer hook double blade tip base 2i and the inner hook retainer base 2j is completely filled by the bobbin thread feeder 8.

[0033] For the fabrication of the lower thread feeder 8, see Figures A, B, C, D, and E. See Figure C. The length of the side surface 8b of the bobbin thread feeder is approximately 9 cm, 5 mm, with a 5 mm adhesive section. A 7 mm adhesive area a is provided to attach the bottom part 8a of the bobbin thread feeder.

[0034] See Figure B(1). The radius of the bottom part 8a of the bobbin thread feeder is approximately 14 mm. As shown in Figure B(2), the height of the side surface 8b of the lower thread feeder is approximately 7 mm. Referring to Figures C(1) and (2), double-sided adhesive tape is applied to the attachment part a of the bottom part 8a of the bobbin thread feeder, a cut is made to make it circular, the side part 8b of the bobbin thread feeder is made into a ring with a circumference of approximately 9 cm, the bottom part 8a of the bobbin thread feeder is placed inside the ring, and the bottom part 8a of the bobbin thread feeder is adhered with the double-sided adhesive tape applied to the attachment part a of the bottom part 8a of the bobbin thread feeder, and the bobbin thread feeder frame 8(1) is created as shown in Figure B(2). The bottom 8a of the bobbin thread feeder is made with a radius of 12 mm, the same as the bottom of a lockstitch sewing machine, to allow the outer hook 2 to rotate smoothly. Therefore, insert the bobbin thread feeder frame 8(1) into the outer hook 2 and adjust the size of the bobbin thread feeder frame 8(1) by pressing it with your fingers so that it makes contact with the interior without any gaps and so that the outer hook 2 rotates smoothly. By repeating this process, the upper edge of the side 8b of the bobbin thread feeder makes contact with the lower edge of the outer hook side guide rail groove 2e. The excess upper edge of the side 8b of the bobbin thread feeder is folded back. Cut off all of the folded back portion, and attach the inner hook 3 to the outer hook 2. Once installation is complete, adjust the size by pressing it with your fingers so that the bobbin thread feeder 8 makes contact with the outer hook 2 without any gaps and so that the outer hook 2 rotates smoothly. If the outer hook 2 does not rotate smoothly even after repeating this process, scrape off the side of the lower part of the inner hook side guide rail 3f to allow it to rotate smoothly. As shown in Figure E, a gap 11 is formed between the upper edge of the side of the bobbin thread feeder and the notched portions 3f(1) and 3f(2) of the guide rail on the side of the inner hook.

[0035] Once the lower thread feeder frame 8(1) is made, see Figure D. Attach the lower thread introduction tube 5(2) to the lower thread feeder frame 8(1) with adhesive tape. The lower thread introduction tube 5(2) stops the rotation of the lower thread feeder 8, and the lower thread feeder 8 is now complete.

[0036] Make sure that the upper thread 12 is not tangled with the bobbin thread 13. Hook the upper thread 12 onto the two blades 2a of the outer hook, hold down the inner hook 3 with your fingers, and turn the outer hook 2 by hand while keeping the inner hook 3 still. The upper thread 2 that has passed through the needle eye is made into a loop by the two blades 2a of the outer hook, and one of the loops enters the inside of the lower thread feeder 8 through the gap 11 between the inner hook side surface 3g and the lower thread feeder side surface 8b, passes over the top of the lower thread introduction tube 5(2), straddles the center of the outer hook bottom 2c, rises, and exits the hook through the gap 11 between the inner hook outer side surface 3g and the lower thread feeder side surface 8b without becoming entangled with the lower thread of the lower thread introduction tube (52) and is pulled up into the needle eye.

[0037] 1. Place the lower thread feeder 8 inside the outer hook so that the upper edge of the side of the lower thread feeder contacts the lower part of the outer hook guide rail groove. 2. The side surface of the lower thread feeder 8 completely blocks the opposing space 2k between the outer hook two blade tip base portion 2i and the inner hook retainer base portion 2j. 3. A gap 11 is formed between the side surface of the lower thread feeder and the notched portions 3f(1) and 3f(2) of the guide rail on the side surface of the inner hook, through which the needle thread enters and leaves the inside of the lower thread feeder. 4. The entire unsewn portion of the bobbin thread is passed through the bobbin thread introduction tube 5 using a threader, introduced into the bobbin thread feeder, and attached to the bottom. 5. The upper thread is hooked onto the two blade tips of the outer hook, and the rotating shaft is rotated. One of the upper thread loops enters the inside of the bobbin thread feeder 8 through the thread inlet / outlet 11, passes over the top of the bobbin thread introduction tube (bobbin thread), and crosses the center of the bottom of the bobbin thread feeder. The upper thread does not get tangled in the bobbin thread introduction tube (bobbin thread) (the upper thread loop passes through the bobbin thread feeder), but comes out of the hook through the gap 11 and is pulled up into the needle hole of the needle plate. Using a model, it was confirmed that the upper thread did not get tangled in the lower thread introduction tube (lower thread) inside the lower thread feeder 8. [Industrial Applicability]

[0038] The continuous bobbin thread supply device can continuously supply bobbin thread, automating the work process, improving the manual labor system, and quickly responding to environmental changes, allowing for increased production of inexpensive, high-quality commercial crystals. [Explanation of symbols]

[0039] I is the rotation axis, 2 is the outer hook, 2a is the two blade tips of the outer hook, 2b is the inner hook retainer, 2c is the bottom of the outer hook, 2d is the outer hook shaft, 2e is the guide rail groove on the side of the outer hook, 2f is the inner side of the outer hook, 2h is the one blade tip of the outer hook, 2i is the base of the two blade tips of the outer hook, 2j is the base of the inner hook retainer, 2k is the opposing space between the base 2i of the two blade tips of the outer hook and the base 2j of the inner hook retainer, 3 is the inner hook, 3a is the central axis of the inner hook, 3b is the mounting hole for the bobbin thread introduction tube, 3c is the mounting frame for the central axis of the inner hook, 3d is the bottom of the inner hook, 3f is the guide rail on the side of the inner hook, 3f(1) and 3f(2) are the notches for the guide rail on the side of the inner hook, 3g is the outer side of the inner hook, 3h is the mounting recess for the bobbin thread introduction tube 5(2), 3i is the mounting groove for the bobbin thread feeder, 4 is the bobbin case, 4a is the central axis of the bobbin case, 4b is the bobbin thread introduction Tube 5(2) insertion space, 4c is the bobbin case thread outlet, 4d is the thread tension spring, 4e is the groove, 4f is the iron plate with a thread passage hole, 4g is the bobbin case recess, 4h is the knob, 5 is the bobbin thread introduction tube, 5a is the bobbin thread introduction tube thread inlet, 5b is the bobbin thread introduction tube thread outlet, 5c is the bobbin thread introduction tube 5(2) thread outlet shaft, 5(1) is the bobbin thread introduction tube for the outside of the hook, 5(2) is the inside of the hook a bobbin thread introduction tube for the bobbin thread feeder, 5d is a screw thread, 6 is a joint, 6a is a joint shaft, 6c is a joint shaft thread inlet, 6d is a joint shaft thread outlet, 6e is a joint head, 7 is a bobbin thread introduction tube mounting frame, 8 is a bobbin thread feeder, 8a is a bottom part of the bobbin thread feeder, 8b is a side surface of the bobbin thread feeder, 8(1) is a bobbin thread feeder frame, 9 is a screw, 11 is a gap between the side surface of the inner hook and the side surface of the bobbin thread feeder, 12 is an upper thread, and 13 is a bobbin thread.

Claims

1. an outer hook 2 having a rotary shaft 1 and a bobbin thread introduction tube mounting frame 7 to which a bobbin thread introduction tube 5(1) is attached; a bobbin thread feeder 8 that closes the opposing space 2k between the outer hook two blade tip root portion 2i and the inner hook holder root portion 2j, introduces the bobbin thread from the outside of the bobbin hook into the inside of the bobbin hook, passes it through a thread passing hole 4f opened in an iron plate attached to the bobbin case central shaft 4a, and draws it out to the bobbin case thread outlet 4c; The inner hook 3 has a groove 3i for mounting the lower thread feeder 8, a recess 3h for mounting the lower thread guide pipe 5(2), and the side of the lower portion of the guide rail on the side of the inner hook scraped off. A bobbin case 4 has a space 4b for inserting the bobbin thread guide tube 5(2) on the side of the bobbin case, and a central shaft 4a on which an iron plate having a thread passage hole 4f is attached. Equipped with The shape of the lower thread feeder frame 8(1) of the lower thread feeder 8 is such that, when the shuttle is assembled, the lower thread feeder side surface 8b and the inner surface 2f of the outer shuttle are in contact with each other without any gaps when the lower thread feeder 8 is attached to the lower thread feeder attachment groove 3i cut in the inner shuttle side guide rail 3f and the lower thread introduction pipe 5(2) attachment groove 3h, and the lower thread feeder side surface 8b forms a wall in the opposing space 2k between the outer shuttle double blade tip root portion 2i and the inner shuttle retainer root portion 2j, closing the opposing space 2k and preventing the upper thread 12 from entering the opposing space 2k and preventing the upper thread 12 from becoming entangled with the lower thread 13 within the lower thread feeder 8. A continuous bobbin thread supplying device characterized by the above.

2. 2. A continuous bobbin thread supplying device according to claim 1, characterized in that the bobbin thread supplying device (8) (1) is provided with a bobbin thread introduction tube (5) (2) and a joint (6).

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