An auxiliary replacement device for the sewing machine spool used for school uniforms

Abstract

The present invention discloses an auxiliary device for replacing a sewing machine spool for making school uniforms, which relates to the technical field of spool replacement. The auxiliary device for replacing a sewing machine spool includes a bottom plate. The upper surface of the bottom plate is fixedly installed with a housing. The outer surface of the housing is fixedly installed with a channel pipe. A plurality of spools are arranged inside the housing. The outer surface of the bottom plate is provided with a replacement mechanism for assisting in replacing the sewing machine spool. The inside of the housing is provided with an auxiliary mechanism for assisting in finding the thread end of the replaced spool. The replacement mechanism includes a control component for assisting in replacing the sewing machine spool and a moving component for controlling the control component to replace the spool. By the combined use of the moving component and the control component, timely replacement of the spool is achieved. When the thread on the spool is used up, timely replacement of a new spool can immediately resume the operation of the sewing machine, avoid production interruption, thereby improving production efficiency. It can also ensure sufficient and stable supply of the thread and maintain the coherence of the production process.

Description

Technical Field

[0001] The present invention relates to the technical field of bobbin replacement, and particularly to an auxiliary bobbin replacement device for a sewing machine used in producing school uniforms. Background Technique

[0002] The bobbin for a sewing machine used in producing school uniforms is a component on the sewing machine for winding the thread. It is usually a cylindrical member located in a bobbin holder above or below the sewing machine. The bobbin can be made of metal, plastic or other materials and has a certain capacity to hold the thread. During operation, the bobbin assists in the smooth winding and supply of the thread to ensure the normal use of the thread. When the thread on the bobbin is used up, it needs to be replaced in time. The traditional way to replace the bobbin is through manual replacement by workers, which requires more manpower and time investment compared to mechanical replacement. Moreover, manual bobbin replacement requires the operator to have certain technical experience and operation skills, otherwise it is easy to have operation errors or incorrect bobbin installation. The manual replacement method still has many deficiencies during use or work.

[0003] The specific defects are as follows:

[0004] ① When the thread on the bobbin is used up, the operator cannot find and replace it in time. The failure to replace the new thread in time will cause the sewing machine to stop working, prolong the production time, affect the production progress and efficiency, and also delay the normal sewing work, wasting time and resources.

[0005] ② For the newly replaced bobbin of the sewing machine, the end of the thread needs to be found and led out. It is easy for manual operation to fail to find the thread end, which will lead to the inability to conduct the thread leading work, thus prolonging the downtime and affecting the production progress and efficiency. In the case of not being able to find the thread end, the operator needs to spend extra time and energy to find the thread end or re-lead the thread, which will waste time and resources.

[0006] Therefore, the present invention proposes an auxiliary bobbin replacement device for a sewing machine used in producing school uniforms to improve the deficiencies of the traditional technology and be able to achieve auxiliary bobbin replacement and improve work efficiency. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides an auxiliary bobbin replacement device for a sewing machine used in producing school uniforms, which solves the problems raised in the above background technique.

[0008] To achieve the above object, the present invention is realized by the following technical solutions: A sewing machine spool auxiliary replacement device for producing school uniforms, which is used to assist in replacing the used spool in the sewing machine. The sewing machine spool auxiliary replacement device for producing school uniforms includes a bottom plate, and the upper surface of the bottom plate is fixedly installed with a housing. A channel pipe is fixedly installed on the outer surface of the housing. A plurality of spools are arranged inside the housing. A replacement mechanism for assisting in replacing the sewing machine spool is arranged outside the bottom plate. An auxiliary mechanism for assisting in finding the thread end of the replaced spool is arranged inside the housing;

[0009] The replacement mechanism includes a control component for assisting in replacing the sewing machine spool, and a moving component for controlling the control component to replace the spool;

[0010] The auxiliary mechanism includes a thread-end finding component for assisting in finding the thread end of the replaced spool, and a pushing component for pushing out the used spool from the housing.

[0011] Preferably, the moving component includes a lower disc fixedly connected to the upper surface of the bottom of the housing. A plurality of return springs are fixedly connected to the upper surface of the lower disc. The ends of the return springs away from the lower disc are all fixedly connected to an upper disc. A first connecting rod is fixedly connected to the outside of the upper disc. A first chute is opened on the outer surface of the housing.

[0012] Preferably, the control component includes a second connecting rod fixedly connected to the outside of the upper disc. The second connecting rod slides in the first chute. A rotating column is fixedly installed on the outer surface of the bottom plate. A first cylinder is fixedly installed at the end of the rotating column away from the bottom plate. Four card slots are opened on the outer surface of the first cylinder. The four card slots are evenly distributed around the surface of the first cylinder. A second cylinder is fixedly connected to the side of the first cylinder away from the rotating column. Four round rods are fixedly installed on the outside of the second cylinder. The four round rods are evenly distributed around the outside of the second cylinder.

[0013] Preferably, the thread-end finding component includes an annular plate fixedly connected to the inner wall of the housing. A circular tube is rotatably connected to the upper surface of the annular plate. A plurality of pointed cylinders are fixedly installed on the inner wall of the circular tube. A first spiral groove is opened on the inner wall of the circular tube. A first slider is slidably connected to the inner wall of the first spiral groove. The outside of the first slider is fixedly connected to the first connecting rod. A through negative pressure suction tube is fixedly connected inside the housing.

[0014] Preferably, the pushing component includes a fourth cylinder fixedly installed on the upper surface of the bottom plate. The upper surface of the fourth cylinder is rotatably connected to a third cylinder. A second spiral groove is formed on the outer surface of the third cylinder. The upper surface of the third cylinder is rotatably connected to a rotating block. The upper surface of the end of the rotating block away from the third cylinder is rotatably connected to a third connecting rod. The bottom of the end of the third connecting rod away from the rotating block is rotatably connected to a pushing rod. The end of the pushing rod away from the third connecting rod is located inside the housing. A second sliding groove is formed on the outer surface of the housing. A second slider is slidably connected inside the second spiral groove. One side of the second slider away from the second spiral groove is fixedly connected to a fourth connecting rod. The end of the fourth connecting rod away from the second slider is fixedly connected to the upper disc. The fourth connecting rod slides inside the second sliding groove.

[0015] Preferably, the end of the second connecting rod away from the housing is in an inverted "J" shape, and the second connecting rod slides inside the clamping groove.

[0016] Preferably, the shape of the second spiral groove is composed of a spiral section and a vertical section, and the vertical section of the second spiral groove connects the head end and the tail end of the spiral section.

[0017] Preferably, the pointed cylinders are evenly distributed around the upper inner wall of the circular tube.

[0018] Preferably, a spool can be clamped between the round rods.

[0019] The sewing machine spool auxiliary replacement device provided by the present invention has the following beneficial effects:

[0020] 1. Through the combined use of the control component, the auxiliary replacement of the sewing machine spool is realized, reducing the use of manpower. The auxiliary replacement of the spool can quickly and accurately complete the replacement of the spool, saving the time for the operator to search for the spool and perform manual replacement, reducing the influence of human factors on the spool replacement process, reducing the risk of errors, and being beneficial to improving the production efficiency when mass-producing school uniforms.

[0021] 2. Through the combined use of the moving component and the control component, the timely replacement of the spool is realized. When the thread on the spool is used up, replacing the new spool in time can immediately resume the work of the sewing machine, avoiding production interruption or prolongation of the downtime, thereby improving the production efficiency. It can also ensure the sufficient and stable supply of the thread, maintaining the coherence and stability of the production process.

[0022] 3. Through the combined use of the thread finding component, the thread end of the new spool can be automatically found. The function of automatically finding the thread end can help the operator save the time and effort of manually searching for the thread end, saving the operation time, improving the work efficiency, and also avoiding the waste of the thread caused by the operator's error. Finding the thread end accurately each time can perform the sewing operation more stably. Brief Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a schematic diagram of the rear view structure of the present invention;

[0025] Figure 3 is a schematic diagram of the internal structure of the present invention;

[0026] Figure 4 is a schematic diagram of the rear view internal structure of the present invention;

[0027] Figure 5 is Figure 4 an enlarged schematic diagram of the structure at A in

[0028] Figure 6 is a schematic diagram of the moving component and the wire end finding component structure of the present invention;

[0029] Figure 7 is a schematic diagram of the control component structure of the present invention;

[0030] Figure 8 is a schematic diagram of the rear view structure of the control component of the present invention;

[0031] Figure 9 is a schematic diagram of the pushing component structure of the present invention.

[0032] The reference numerals in the figure respectively represent:

[0033] 1, bottom plate; 2, outer shell; 3, channel pipe; 4, spool; 5, replacement mechanism; 6, auxiliary mechanism;

[0034] 51, moving component; 511, upper disc; 512, return spring; 513, lower disc; 514, first connecting rod; 515, first chute;

[0035] 52, control component; 521, second connecting rod; 522, rotating column; 523, first cylinder; 524, card slot; 525, second cylinder; 526, round rod;

[0036] 61, wire end finding component; 611, circular ring plate; 612, circular pipe; 613, first spiral groove; 614, pointed cylinder; 615, first slider; 616, negative pressure suction pipe;

[0037] 62, pushing component; 621, push rod; 622, third connecting rod; 623, rotating block; 624, third cylinder; 625, second spiral groove; 626, fourth connecting rod; 627, second slider; 628, fourth cylinder; 629, second chute. Detailed Description of the Invention

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Reference Figures 1 to 4 Figures 1 to 4 , an auxiliary replacement device for a sewing machine bobbin used for producing school uniforms will be described in detail below. An auxiliary replacement device for a sewing machine bobbin used for producing school uniforms is used to assist in replacing the used bobbin in the sewing machine. An auxiliary replacement device for a sewing machine bobbin used for producing school uniforms includes a bottom plate 1, an outer shell 2 is fixedly installed on the upper surface of the bottom plate 1, a channel pipe 3 is fixedly installed on the outer surface of the outer shell 2, a plurality of bobbins 4 are arranged inside the outer shell 2, and a replacement mechanism 5 for assisting in replacing the sewing machine bobbin 4 is arranged outside the bottom plate 1. An auxiliary mechanism 6 for automatically finding the thread end of the replaced bobbin 4 is arranged inside the outer shell 2;

[0040] The replacement mechanism 5 includes a control component 52 for assisting in replacing the sewing machine bobbin 4, and a moving component 51 for controlling the control component 52 to replace the bobbin 4;

[0041] The auxiliary mechanism 6 includes a thread-finding component 61 for automatically finding the thread end of the replaced bobbin 4, and a pushing component 62 for pushing the used-up bobbin 4 out of the outer shell 2.

[0042] Reference Figures 5 to 8 Figures 5 to 8 , the moving component 51 includes a lower disc 513 fixedly connected to the upper surface of the bottom of the outer shell 2, a plurality of return springs 512 are fixedly connected to the upper surface of the lower disc 513, one ends of the return springs 512 away from the lower disc 513 are fixedly connected to an upper disc 511, a first connecting rod 514 is fixedly connected to the outside of the upper disc 511, and a first sliding groove 515 is opened on the outer surface of the outer shell 2. Through the combined use of the moving component 51 and the control component 52, the timely replacement of the bobbin 4 is realized. When the thread of the bobbin 4 is used up, the timely replacement of a new bobbin 4 can immediately resume the operation of the sewing machine, avoiding production interruption or prolongation of the downtime, thereby improving production efficiency.

[0043] Reference Figures 5 to 7, the control component 52 includes a second connecting rod 521 fixedly connected to the outer side of the upper disk 511. One end of the second connecting rod 521 away from the housing 2 is in an inverted "J" shape. The second connecting rod 521 slides in the card slot 524 and also slides in the first sliding groove 515. A rotating column 522 is fixedly installed on the outer surface of the bottom plate 1. A driving device is arranged outside the rotating column 522, and the driving device is a motor. One end of the rotating column 522 away from the bottom plate 1 is fixedly installed with a first cylinder 523. Four card slots 524 are opened on the outer surface of the first cylinder 523, and the four card slots 524 are evenly distributed around the surface of the first cylinder 523. One side of the first cylinder 523 away from the rotating column 522 is fixedly connected to a second cylinder 525. Four round rods 526 are fixedly installed on the outer side of the second cylinder 525. A spool 4 can be clamped between the round rods 526, and the four round rods 526 are evenly distributed around the outer side of the second cylinder 525. Through the cooperative use of the control component 52, the auxiliary replacement of the sewing machine spool 4 is realized, the use of manpower is reduced, and the auxiliary replacement of the spool 4 can complete the replacement of the spool 4 quickly and accurately, saving the time for the operator to find the spool 4 and perform manual replacement.

[0044] Reference Figure 5 , the thread end finding component 61 includes an annular plate 611 fixedly connected to the inner wall of the housing 2. A circular tube 612 is rotatably connected to the upper surface of the annular plate 611. A plurality of pointed cylinders 614 are fixedly installed on the inner wall of the circular tube 612, and the pointed cylinders 614 are evenly distributed above the inner wall of the circular tube 612. A first spiral groove 613 is opened on the inner wall of the circular tube 612, and a first slider 615 is slidably connected to the inner wall of the first spiral groove 613. The outer side of the first slider 615 is fixedly connected to the first connecting rod 514. A through negative pressure suction tube 616 is fixedly connected inside the housing 2, and the negative pressure suction tube 616 is implemented as a negative pressure generator, so that the thread end of the spool 4 can be better attracted into the tube. Through the cooperative use of the thread end finding component 61, the automatic finding of the thread end of the new spool 4 is realized. The function of automatically finding the thread end can help the operator save the time and energy of manually finding the thread end, save the operation time, and improve the work efficiency.

[0045] Reference Figures 8 to 9, the driving component 62 includes a fourth cylinder 628 fixedly installed on the upper surface of the bottom plate 1. The upper surface of the fourth cylinder 628 is rotatably connected to a third cylinder 624. A second helical groove 625 is formed on the outer surface of the third cylinder 624. The pointed cylinders 614 are evenly distributed around the inner wall above the circular tube 612. The upper surface of the third cylinder 624 is rotatably connected to a rotating block 623. The upper surface of the end of the rotating block 623 away from the third cylinder 624 is rotatably connected to a third connecting rod 622. The bottom of the end of the third connecting rod 622 away from the rotating block 623 is rotatably connected to a push rod 621. One end of the push rod 621 located inside the housing 2 has a side surface in the shape of an arc plate, which is convenient for pushing the spool 4. The end of the push rod 621 away from the third connecting rod 622 is located inside the housing 2. A second sliding groove 629 is formed on the outer surface of the housing 2. A second slider 627 is slidably connected inside the second helical groove 625. One side of the second slider 627 away from the second helical groove 625 is fixedly connected to a fourth connecting rod 626. The end of the fourth connecting rod 626 away from the second slider 627 is fixedly connected to the upper disc 511. The fourth connecting rod 626 slides inside the second sliding groove 629.

[0046] The following is the entire working process and working principle of the above embodiment:

[0047] When the spool 4 wound with thread is located above the upper disc 511, the gravity of the spool 4 presses down the upper disc 511. The upper disc 511 squeezes the return spring 512. The thread on the spool 4 gradually decreases during use, and the weight of the spool 4 gradually lightens. The return spring 512 slowly moves upward all the time. The return spring 512 drives the upper disc 511 to move upward. The upper disc 511 drives the second connecting rod 521 fixedly connected thereto to move upward. The second connecting rod 521 slides upward in the card slot 524. When all the thread on the spool 4 is used up, the return spring 512 resets. The upper disc 511 drives the second connecting rod 521 to leave the card slot 524. The rotating column 522 is externally connected to a motor. The motor drives the rotating column 522 to rotate clockwise. The rotating column 522 drives the first cylinder 523 fixedly connected thereto to rotate clockwise. The first cylinder 523 drives the second cylinder 525 fixedly connected thereto to rotate clockwise. The second cylinder 525 drives the round rod 526 fixedly connected thereto to rotate. During the rotation of the round rod 526, it moves away from the round rod 526. The spool 4 wound with thread stuck by the round rod 526 moves downward due to its own gravity and moves onto the used-up spool 4. The gravity of the spool 4 wound with thread causes the upper disc 511 to move downward. The upper disc 511 squeezes the return spring 512. During the downward movement of the upper disc 511, it drives the second connecting rod 521 to move downward. The end of the second connecting rod 521 close to the card slot 524 moves into the card slot 524. Since the second connecting rod 521 cannot rotate, the second connecting rod 521 blocks the first cylinder 523. The first cylinder 523 stops rotating. Since the force of the second connecting rod 521 blocking the first cylinder 523 is greater than the rotational force of the motor, the motor stops rotating. The second cylinder 525 fixedly connected to the first cylinder 523 stops rotating. The round rod 526 fixedly connected to the second cylinder 525 also stops rotating. The two round rods 526 block the spool 4 wound with thread. Through the coordinated use of the moving assembly 51 and the control assembly 52, the timely replacement of the spool 4 is realized. When the thread on the spool 4 is used up, replacing the new spool 4 in time can immediately resume the operation of the sewing machine, avoid production interruption or extension of the downtime, thereby improving production efficiency. It can also ensure sufficient and stable supply of the thread and maintain the coherence and stability of the production process.

[0048] During the downward movement of the upper disc 511, the first connecting rod 514 fixedly connected thereto is driven to move downward. The downward movement of the first connecting rod 514 drives the first slider 615 to slide in the first spiral groove 613. The first slider 615 presses against the inclined inner wall of the first spiral groove 613, causing the circular tube 612 to rotate circumferentially. The rotation of the circular tube 612 drives the pointed cylinder 614 fixedly connected thereto to rotate. When the pointed cylinder 614 rotates, it touches the wire wound around the spool 4 and inserts a part into the coil. The wire passes through the pointed cylinder 614. During the rotation process, the pointed cylinder 614 separates the wire wound on the surface of the spool 4. The wire on the spool 4 becomes loose, and the wire end appears on the surface. The wire end of the spool 4 is sucked into the negative pressure suction tube 616 through the negative pressure suction tube 616. By the combined use of the wire end finding assembly 61, the function of assisting in finding the wire end of the new spool 4 is realized. The function of assisting in finding the wire end can help the operator save the time and effort of manually finding the wire end, save the operation time, and improve the work efficiency.

[0049] During the downward movement of the upper disc 511, the fourth connecting rod 626 fixedly connected thereto is driven to move downward. The fourth connecting rod 626 drives the second slider 627 fixedly connected thereto to slide in the second spiral groove 625. The second slider 627 presses against the inclined inner wall of the second spiral groove 625. The pressing force of the second slider 627 causes the third cylinder 624 to rotate one circle. The rotation of the third cylinder 624 drives the rotating block 623 fixedly connected thereto to rotate. When the rotating block 623 rotates, it drives the follow-up movement of the third connecting rod 622. Since the third connecting rod 622 is rotationally connected to the rotating block 623, the third connecting rod 622 moves up and down as the rotating block 623 rotates. When the third connecting rod 622 moves towards the housing 2, it drives the push rod 621 rotationally connected thereto to push inward. The push rod 621 pushes the used spool 4 into the channel tube 3. The spool 4 full of wire falls above the upper disc 511. After the spool 4 full of wire is used up, the weight of the spool 4 decreases, and the return spring 512 resets. The return spring 512 drives the upper disc 511 to move upward. The upper disc 511 drives the fourth connecting rod 626 to move upward. The fourth connecting rod 626 slides in the second chute 629. The fourth connecting rod 626 drives the second slider 627 fixedly connected thereto to move upward in the vertical section of the second spiral groove 625. By the combined use of the pushing assembly 62, the used spool 4 is pushed away from the inside of the housing 2, preventing it from affecting the use of the new spool 4 and preventing damage to the auxiliary replacement device.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary replacement device for a sewing machine spool used for making school uniforms, which is used to assist in replacing the spool that has been used up in the sewing machine, and is characterized in that, It includes a bottom plate (1), on the upper surface of the bottom plate (1), a housing (2) is fixedly installed, on the outer surface of the housing (2), a channel pipe (3) is fixedly installed, inside the housing (2), a plurality of spools (4) are arranged, outside the bottom plate (1), a replacement mechanism (5) for assisting in replacing the sewing machine spool (4) is arranged, and inside the housing (2), an auxiliary mechanism (6) for assisting in finding the thread end of the replaced spool (4) is arranged; The replacement mechanism (5) includes a control component (52) for assisting in replacing the sewing machine spool (4), and a moving component (51) for controlling the control component (52) to replace the spool (4); The moving component (51) includes a lower disk (513) fixedly connected to the upper surface of the bottom of the housing (2), on the upper surface of the lower disk (513), a plurality of return springs (512) are fixedly connected, and the ends of the return springs (512) away from the lower disk (513) are all fixedly connected to an upper disk (511), and a first sliding groove (515) is formed on the outer surface of the housing (2); The control component (52) includes a second connecting rod (521) fixedly connected to the outside of the upper disk (511), the second connecting rod (521) slides in the first sliding groove (515), a rotating column (522) is fixedly installed on the outer surface of the bottom plate (1), at the end of the rotating column (522) away from the bottom plate (1), a first cylinder (523) is fixedly installed, four card slots (524) are formed on the outer surface of the first cylinder (523), on the side of the first cylinder (523) away from the rotating column (522), a second cylinder (525) is fixedly connected, and four round rods (526) are fixedly installed on the outside of the second cylinder (525); During the downward movement of the upper disk (511), the second connecting rod (521) is driven to move downward, and the end of the second connecting rod (521) close to the card slot (524) moves into the card slot (524); One spool (4) can be clamped between the round rods (526); The auxiliary mechanism (6) includes a thread end finding component (61) for automatically finding the thread end of the replaced spool (4), and a pushing component (62) for pushing out the spool (4) with used-up thread from the housing (2).

2. The auxiliary replacement device for the sewing machine spool used for producing school uniforms according to claim 1, wherein: The four card slots (524) are evenly distributed around the surface of the first cylinder (523), and the four round rods (526) are evenly distributed around the outside of the second cylinder (525).

3. The auxiliary replacement device for a sewing machine spool for producing school uniforms according to claim 1, wherein: The wire-end finding component (61) includes an annular plate (611) fixedly connected to the inner wall of the outer shell (2). A circular tube (612) is rotatably connected to the upper surface of the annular plate (611). A plurality of pointed cylinders (614) are fixedly installed on the inner wall of the circular tube (612). A first spiral groove (613) is formed in the inner wall of the circular tube (612). A first slider (615) is slidably connected to the inner wall of the first spiral groove (613). The outer side of the first slider (615) is fixedly connected to a first connecting rod (514). The outer side of the upper disc (511) is fixedly connected to a first connecting rod (514). A penetrating negative pressure suction tube (616) is fixedly connected inside the outer shell (2).

4. The auxiliary replacement device for the sewing machine spool used for producing school uniforms according to claim 1, wherein: The pushing component (62) includes a fourth cylinder (628) fixedly installed on the upper surface of the bottom plate (1). A third cylinder (624) is rotatably connected to the upper surface of the fourth cylinder (628). A second spiral groove (625) is formed on the outer surface of the third cylinder (624). A rotating block (623) is rotatably connected to the upper surface of the third cylinder (624). The upper surface of the end of the rotating block (623) away from the third cylinder (624) is rotatably connected to a third connecting rod (622). The bottom of the end of the third connecting rod (622) away from the rotating block (623) is rotatably connected to a push rod (621). The end of the push rod (621) away from the third connecting rod (622) is located inside the outer shell (2). A second chute (629) is formed on the outer surface of the outer shell (2). A second slider (627) is slidably connected to the inside of the second spiral groove (625). The side of the second slider (627) away from the second spiral groove (625) is fixedly connected to a fourth connecting rod (626). The end of the fourth connecting rod (626) away from the second slider (627) is fixedly connected to the upper disc (511). The fourth connecting rod (626) slides in the second chute (629).

5. The auxiliary replacement device for a sewing machine spool used in producing school uniforms according to claim 1, characterized in that: The end of the second connecting rod (521) away from the outer shell (2) is in an inverted "J" shape. The second connecting rod (521) slides in the card slot (524).

6. The auxiliary replacement device for the sewing machine spool used for producing school uniforms according to claim 4, characterized in that: The shape of the second spiral groove (625) consists of a spiral section and a vertical section. The vertical section of the second spiral groove (625) connects the head end and the tail end of the spiral section.

7. The auxiliary replacement device for a sewing machine bobbin used for producing school uniforms according to claim 3, wherein: The pointed cylinders (614) are evenly distributed around the upper inner wall of the circular tube (612).

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