Automatic bobbin changing mechanism for a sewing machine

Abstract

The utility model relates to sewing machine technical field, concretely relates to a shuttle core automatic replacement mechanism for sewing machine, the mechanism includes fixed plate, its arrangement is at the side of the shuttle hook assembly of sewing machine, the shuttle disc is rotatoryly installed at the front of fixed plate, and the shuttle disc is evenly surrounded with a plurality of shuttle core installation sites in 360 degrees, and the shuttle core installation site is used for the detachable installation shuttle core with the bottom line, and the back of fixed plate has the protruding piece corresponding with each shuttle core installation site, the drawing assembly is located between the shuttle disc and the shuttle hook assembly, and the drawing assembly includes the pull -out structure and the boost structure, the rotary boost assembly is arranged at the back of fixed plate, and the rotary boost assembly includes the reciprocating movable pusher, and the pusher is used for pushing the protruding piece to set the index rotation, and further makes the shuttle core on the protruding piece corresponding shuttle core installation site reach the position of being pulled out by the drawing assembly, the application solves the technical problem that sewing machine replaces the shuttle core and the time -consuming is longer, leads to the low production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to an automatic bobbin changing mechanism for sewing machines. Background Technology

[0002] Sewing machines (flatbed sewing machines) are core equipment for stitching fabrics in clothing, bags, and home textiles. They create a lockstitch by interlacing the needle and shuttle with double threads, resulting in neat stitches, easy operation, and wide applicability. When the sewing machine is working, the needle carries the fabric through it. As the needle rises, a loop of thread forms beneath the fabric. The bobbin thread is stored in the bobbin. The shuttle (rotary or oscillating shuttle) hooks onto the upper thread loop, causing the upper and lower threads to interlace in the fabric, forming a strong lockstitch. Power from a motor or foot pedal is transmitted to the main shaft via belts and gears, driving the needle, shuttle, and feed dog to operate synchronously, ensuring even stitches.

[0003] For example, patent application CN115573109A discloses an automatic sewing machine, which includes a sewing machine with a sewing plane; a material storage assembly disposed on one side of the sewing machine for holding the material to be sewn; a feeding assembly including a first guiding device and a material picking device, the first guiding device being mounted between the sewing plane of the sewing machine and the material storage assembly, and the material picking device being slidably connected to the first guiding device to pick up the material from the material storage assembly and move it to the sewing plane of the sewing machine; and a receiving assembly disposed on one side of the sewing machine, including a clamping device capable of clamping and transferring the material on the sewing plane of the sewing machine. This automatic sewing machine of the present invention can automate the entire sewing process, resulting in high consistency and quality at the sewn seams.

[0004] In sewing machines, the bobbin, a key component, is used to store bobbin thread. When the bobbin thread is used up or nearly used up, it needs to be replaced with a bobbin that has been pre-wound with bobbin thread. Currently, when the bobbin thread on a sewing machine runs out, the machine is often stopped for replacement, and replacing a single bobbin takes 30-60 seconds, resulting in low production efficiency. Utility Model Content

[0005] This invention provides an automatic bobbin changing mechanism for sewing machines to solve the technical problem of long bobbin changing time and low production efficiency in existing sewing machines.

[0006] To solve the above problems, the automatic bobbin changing mechanism for sewing machines provided by this utility model adopts the following technical solution:

[0007] An automatic bobbin changing mechanism for a sewing machine includes:

[0008] A fixing plate is arranged next to the rotary hook assembly of the sewing machine;

[0009] The shuttle disc is rotatably mounted on the front of the fixed plate. Multiple bobbin mounting positions are evenly distributed in a 360° circle on the shuttle disc. The bobbin mounting positions are used for detachable installation of bobs with bottom threads. The back of the fixed plate has protrusions corresponding to each bobbin mounting position.

[0010] A pull-out assembly is located between the shuttle and the rotary hook assembly. The pull-out assembly includes a pull-out structure for pulling the bobbin out of the shuttle and a push-out structure for pushing the pull-out structure closer to the rotary hook assembly to replace the bobbin.

[0011] A rotary booster assembly is arranged on the back of the fixed plate. The rotary booster assembly includes a reciprocating pusher for pushing the protrusion to rotate at a set indexing interval, thereby causing the bobbin on the bobbin mounting position corresponding to the protrusion to reach the position to be pulled out by the puller assembly.

[0012] The beneficial effects of the automatic bobbin changing mechanism for sewing machines provided by this utility model are as follows: multiple bobs with bobbins already equipped with bobbin thread are integrated and arranged on the bobbin tray. When the bobbin thread of the bobbin on the sewing machine is used up, the bobbin on the bobbin tray is removed by the pulling component and moved to the position of the rotary hook component for bobbin replacement. The rotation booster component is used to drive the bobbin tray to rotate so that the bobbin with bobbin thread is always in the state of being removed. This automates the entire bobbin changing process, effectively reduces the downtime of the sewing machine, greatly improves the bobbin changing efficiency, and solves the technical problem of long bobbin changing time and low production efficiency in the prior art.

[0013] Furthermore, the number of bobbin mounting positions is eight, and the eight bobbin mounting positions are evenly arranged around the center of the bobbin disc.

[0014] Furthermore, each bobbin mounting position is equipped with an L-shaped washer. The bottom of the L-shaped washer has a vertically arranged positioning shaft, and the side of the L-shaped washer has a groove. The positioning shaft is used to insert the bobbin, and the groove is used to insert an ear plate of the bobbin. The groove and positioning shaft improve the stability of the bobbin when it is temporarily stored on the bobbin.

[0015] Furthermore, the L-shaped washer and the shuttle are fixed to the fixed plate by screws, with one end of the screw protruding from the fixed plate to form the protrusion. By forming the protrusion through the protruding end of the screw, no additional structure is needed, reducing costs and simplifying the manufacturing process.

[0016] Furthermore, the rotary booster assembly includes a first cylinder, and a push plate is arranged at the output end of the first cylinder. The push plate is used to push the protrusion to move during reciprocating movement, and the push plate constitutes the pusher.

[0017] Furthermore, the push plate is an elastic sheet to avoid the protruding parts that rotate subsequently during the retraction process.

[0018] Furthermore, the fixing plate is also fixed with limiting plates located on the upper and lower sides of the push plate. The two limiting plates form a moving track for the push plate to move, so as to improve the stability of the push plate's moving trajectory.

[0019] Furthermore, the pull-out structure includes a second cylinder and a third cylinder. The third cylinder is fixed on the body of the sewing machine. A rotating frame is also arranged on the body of the sewing machine. The rotating frame includes a rotatable shaft, a slider is slidably arranged on the shaft, and a mounting frame is fixed on the slider. The mounting frame has the second cylinder. A hook plate located on the output end of the second cylinder is also rotatably arranged on the mounting frame. The output end of the second cylinder is used to push the hook plate to hook the other ear plate of the bobbin during the movement.

[0020] The output end of the third cylinder is aligned with the mounting bracket. The third cylinder is used to push the mounting bracket outward after the second cylinder hooks the ear plate, so as to push the bobbin outward through the mounting bracket to push the bobbin outward onto the bobbin.

[0021] Furthermore, the booster structure includes a fourth cylinder arranged on the machine body. The output end of the fourth cylinder is connected to the rotating shaft via a connecting rod to drive the rotating shaft to rotate, thereby causing the removed bobbin to reach the position of the rotary hook assembly as the mounting frame rotates on the rotating shaft.

[0022] Furthermore, the mounting bracket also has a return spring connected to the hook plate, which is used to drive the hook plate to return to its original position after the second cylinder releases the pressure on the hook plate. Attached Figure Description

[0023] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0024] Figure 1 A schematic diagram of the automatic bobbin changing mechanism for sewing machines provided by this utility model in use (the bobbin is not fully loaded with bobs);

[0025] Figure 2 This is a schematic diagram of the back of the fixing plate in this utility model;

[0026] Figure 3 This is a schematic diagram of the front of the fixing plate in this utility model. Figure 1 (The shuttle disc is covered with bobbins);

[0027] Figure 4This is a schematic diagram of the front of the fixing plate in this utility model. Figure 2 (The bobbin is not fully covered with bobbins);

[0028] Figure 5 This is a three-dimensional illustration of the present invention. Figure 1 (Displays pull-out components);

[0029] Figure 6 This is a three-dimensional illustration of the present invention. Figure 2 (Displays pull-out components);

[0030] Figure 7 This is a three-dimensional illustration of the present invention. Figure 3 (The interaction between the hook plate and the second cylinder is shown, but the return spring is not shown);

[0031] Figure 8 This is a three-dimensional illustration of the present invention. Figure 4 (Displays the engagement of the hook plate and the second cylinder, and the return spring.)

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Fixed plate; 2. Sewing machine; 3. Rotary hook assembly; 4. Shuttle plate; 5. Bobbin; 6. L-shaped gasket; 7. Positioning shaft; 8. Insert groove; 9. First ear plate; 10. Screw; 101. Protruding end; 11. First cylinder; 12. Push plate; 13. Limiting plate; 14. Moving track; 15. Second cylinder; 16. Third cylinder; 17. Machine body; 18. Rotating frame; 19. Rotating shaft; 20. Mounting frame; 21. Hook plate; 22. Fourth cylinder; 23. Return spring; 24. Second ear plate. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0036] An embodiment of the automatic bobbin changing mechanism for sewing machines provided by this utility model:

[0037] like Figures 1 to 8As shown, the automatic bobbin changing mechanism for a sewing machine includes a fixed plate 1, a bobbin 4, a pull-out assembly, and a rotary push-out assembly. The fixed plate 1 is arranged beside the rotary hook assembly 3 of the sewing machine 2. The bobbin 4 is rotatably mounted on the front of the fixed plate 1, and multiple bobbin mounting positions are evenly arranged in a 360° circle on the bobbin 4. The bobbin mounting positions are used for detachably mounting bobbins 5 with bobbin threads. The back of the fixed plate 1 has protrusions corresponding to each bobbin mounting position. The pull-out assembly is located between the bobbin 4 and the rotary hook assembly 3. The pull-out assembly includes a pull-out structure for pulling the bobbin 5 out of the bobbin 4 and a push-out structure for pushing the pull-out structure closer to the rotary hook assembly 3 to replace the bobbin 5. The rotary push-out assembly is arranged on the back of the fixed plate 1. The rotary push-out assembly includes a reciprocating pusher for pushing the protrusion to rotate at a set index, thereby causing the bobbin 5 at the bobbin mounting position corresponding to the protrusion to reach the position pulled out by the pull-out assembly.

[0038] The core advantage of this invention lies in the following: multiple bobbins 5 with bobbin threads are integrated and arranged on the bobbin 4. When the bobbin thread of the bobbin 5 on the sewing machine 2 is used up, the bobbin 5 on the bobbin 4 is removed by the pulling component and moved to the position of the rotary hook component 3 for replacement. The rotation booster component is used to push the bobbin 4 to rotate so that the bobbin 5 with bobbin thread is always in the state of being removed. This automates the entire process of replacing the bobbin 5, effectively reduces the downtime of the sewing machine 2, and greatly improves the efficiency of bobbin 5 replacement.

[0039] Specifically, such as Figures 1 to 4 As shown, there are eight bobbin mounting positions, which are evenly arranged around the center of the bobbin tray 4. Each bobbin mounting position is equipped with an L-shaped pad 6. The bottom of the L-shaped pad 6 has a vertically arranged positioning shaft 7, and the side of the L-shaped pad 6 has a groove 8. The positioning shaft 7 is used to insert the bobbin 5, and the groove 8 is used to insert the first ear plate 9 of the bobbin 5. The groove 8 and the positioning shaft 7 improve the stability of the bobbin 5 when it is temporarily placed on the bobbin tray 4.

[0040] In this embodiment, the L-shaped washer 6 and the shuttle 4 are fixed to the fixing plate 1 by screws 10, with one end of the screw 10 protruding from the fixing plate 1 to form the protrusion. By forming the protrusion through the protruding end 101 of the screw 10, no additional structure is needed, reducing costs and simplifying the manufacturing process. Furthermore, the screw 10 is a standard part, simple in structure, widely available, and easy to collect. In other embodiments, a protrusion can also be separately provided on the side of the fixing plate 1 to serve as a protrusion.

[0041] like Figure 2As shown, the rotary booster assembly includes a first cylinder 11, and a push plate 12 is arranged at the output end of the first cylinder 11. The push plate 12 is used to push the protrusion to move during reciprocating movement, and the push plate 12 constitutes the pushing member. Since the push plate 12 needs to reciprocate, in order to avoid interference with other protrusions during the retraction process, in this embodiment, the push plate 12 is an elastic sheet to avoid subsequent rotating protrusions during the retraction process.

[0042] In addition, such as Figure 2 As shown, the fixed plate 1 is also fixed with limiting plates 13 located on the upper and lower sides of the push plate 12. The two limiting plates 13 form a moving track 14 for the push plate 12 to move, so as to improve the stability of the moving trajectory of the push plate 12.

[0043] like Figure 1 , Figure 2 , Figures 3 to 8 As shown, the pull-out structure includes a second cylinder 15 and a third cylinder 16. The third cylinder 16 is fixed on the body 17 of the sewing machine 2. A rotating frame 18 is also arranged on the body 17 of the sewing machine 2. The rotating frame 18 includes a rotatable shaft 19. A slider is slidably arranged on the shaft 19. A mounting frame 20 is fixed on the slider. The mounting frame 20 has the second cylinder 15. A hook plate 21 located on the output end of the second cylinder 15 is also rotatably arranged on the mounting frame 20. The output end of the second cylinder 15 is used to push the hook plate 21 to hook the second ear plate 24 of the bobbin 5 during the movement. The output end of the third cylinder 16 is aligned with the mounting frame 20. The third cylinder 16 is used to push the mounting frame 20 outward after the second cylinder 15 hooks the ear plate, so as to push the bobbin 5 outward from the bobbin 4 through the mounting frame 20.

[0044] Meanwhile, when the mounting bracket 20 returns to its original position, it can be manually pushed along the rotating shaft 19 to restore it to a position where it can be contacted by the output end of the third cylinder 16.

[0045] To facilitate the reset of the hook plate 21, the mounting bracket 20 is also equipped with a reset spring 23 connected to the hook plate 21. The reset spring 23 is used to drive the hook plate 21 to reset after the second cylinder 15 releases its pressure on the hook plate 21.

[0046] In this embodiment, the booster structure includes a fourth cylinder 22 arranged on the body 17. The output end of the fourth cylinder 22 is connected to the rotating shaft 19 through a connecting rod to drive the rotating shaft 19 to rotate, thereby causing the removed bobbin 5 to reach the position of the rotary hook assembly 3 as the mounting frame 20 rotates on the rotating shaft 19.

[0047] The working principle of the automatic bobbin changing mechanism for sewing machines provided by this utility model is as follows: when the bobbin 5 in the rotary hook assembly 3 of the sewing machine 2 is about to run out of thread, the bobbin 5 on the bobbin 4 is removed by the pulling component and moved to the position of the rotary hook assembly 3 for bobbin 5 replacement. The rotation booster component is used to push the bobbin 4 to rotate so that the bobbin 5 with the thread is always in the state of being removed. This automates the entire bobbin 5 replacement process, effectively reduces the downtime of the sewing machine 2, and greatly improves the bobbin 5 replacement efficiency.

[0048] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0049] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An automatic bobbin changing mechanism for a sewing machine, characterized in that, include: A fixed plate is arranged next to the rotary hook assembly of the sewing machine; The shuttle disc is rotatably mounted on the front of the fixed plate. Multiple bobbin mounting positions are evenly distributed in a 360° circle on the shuttle disc. The bobbin mounting positions are used for detachable installation of bobs with bottom threads. The back of the fixed plate has protrusions corresponding to each bobbin mounting position. A pull-out assembly is located between the shuttle and the rotary hook assembly. The pull-out assembly includes a pull-out structure for pulling the bobbin out of the shuttle and a push-out structure for pushing the pull-out structure closer to the rotary hook assembly to replace the bobbin. A rotary booster assembly is arranged on the back of the fixed plate. The rotary booster assembly includes a reciprocating pusher for pushing the protrusion to rotate at a set indexing interval, thereby causing the bobbin on the bobbin mounting position corresponding to the protrusion to reach the position to be pulled out by the puller assembly.

2. The automatic bobbin changing mechanism for a sewing machine according to claim 1, characterized in that: The number of bobbin mounting positions is eight, and the eight bobbin mounting positions are evenly arranged around the center of the bobbin.

3. The automatic bobbin changing mechanism for a sewing machine according to claim 2, characterized in that: Each bobbin mounting position is equipped with an L-shaped shim. The bottom of the L-shaped shim has a vertically arranged positioning shaft, and the side of the L-shaped shim has a groove. The positioning shaft is used to insert the bobbin, and the groove is used to insert an ear plate of the bobbin.

4. The automatic bobbin changing mechanism for a sewing machine according to claim 3, characterized in that: The L-shaped gasket and the shuttle are fixed to the fixed plate by screws, and the screw protrudes from one end of the fixed plate to form the protrusion.

5. The automatic bobbin changing mechanism for a sewing machine according to any one of claims 1 to 4, characterized in that: The rotary booster assembly includes a first cylinder, and a push plate is arranged at the output end of the first cylinder. The push plate is used to push the protrusion to move during reciprocating movement, and the push plate constitutes the pusher.

6. The automatic bobbin changing mechanism for a sewing machine according to claim 5, characterized in that: The push plate is an elastic sheet to avoid the protruding parts that rotate during subsequent retraction.

7. The automatic bobbin changing mechanism for a sewing machine according to claim 6, characterized in that: The fixing plate is also fixed with limiting plates located on the upper and lower sides of the push plate. The two limiting plates form a moving track for the push plate to move, so as to improve the stability of the push plate's moving trajectory.

8. The automatic bobbin changing mechanism for a sewing machine according to claim 3 or 4, characterized in that: The pull-out structure includes a second cylinder and a third cylinder. The third cylinder is fixed on the body of the sewing machine. A rotating frame is also arranged on the body of the sewing machine. The rotating frame includes a rotatable shaft. A slider is slidably arranged on the shaft. A mounting frame is fixed on the slider. The mounting frame has the second cylinder. A hook plate located on the output end of the second cylinder is also rotatably arranged on the mounting frame. The output end of the second cylinder is used to push the hook plate to hook the other ear plate of the bobbin during the movement. The output end of the third cylinder is aligned with the mounting bracket. The third cylinder is used to push the mounting bracket outward after the second cylinder hooks the ear plate, so as to push the bobbin outward through the mounting bracket to push the bobbin outward onto the bobbin.

9. The automatic bobbin changing mechanism for a sewing machine according to claim 8, characterized in that: The booster structure includes a fourth cylinder arranged on the body. The output end of the fourth cylinder is connected to the rotating shaft via a connecting rod to drive the rotating shaft to rotate, thereby causing the removed bobbin to reach the position of the rotary hook assembly as the mounting frame rotates on the rotating shaft.

10. The automatic bobbin changing mechanism for a sewing machine according to claim 8, characterized in that: The mounting bracket also has a return spring connected to the hook plate. The return spring is used to drive the hook plate to return to its original position after the second cylinder releases the pressure on the hook plate.

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