Sewing machine bobbin thread supply structure

Abstract

The utility model provides a sewing machine bottom thread supply structure belongs to sewing machine technical field. It has solved the problem that the existing bottom thread supply structure is inconvenient to place and has poor stability. The sewing machine includes a needle plate and a cover plate, the front end of the needle plate has an avoidance opening for the bobbin to pass through, the cover plate is detachably arranged at the front end of the needle plate, the bottom thread supply structure includes a guide seam and a thread cutter at the front end of the needle plate, one end of the guide seam is communicated with the avoidance opening, the other end is provided with the thread cutter, and the cover plate is located directly above the avoidance opening, the guide seam and the thread cutter. The bottom thread supply structure of the sewing machine has the advantages that the bottom thread is convenient to place, and the stability of the bottom thread supply structure is improved.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine bobbin supply structure. Background Technology

[0002] A sewing machine is a mechanical device that uses one or more sewing threads to create specific stitches on a material (such as fabric, leather, etc.), allowing one or more layers of material to interweave or sew together. Before starting to sew, the bottom thread needs to be hooked up with the top thread, which makes the initial sewing operation relatively troublesome.

[0003] To address the aforementioned problems, various improvements have been made, some of which have even been patented. For example, Chinese patent literature discloses a bobbin thread supply device for sewing machines [Patent No.: 200880006940.4; Publication No.: CN101680146A]. The bobbin thread supply device can be installed inside the inner shuttle of the horizontal shuttle of the sewing machine frame. It detachably receives the bobbin thread through the bobbin thread convex opening and is equipped with a tension generating part. The tension generating part causes the clamping plate and clamping spring to be installed in an overlapping state along the inner circumference of the inner shuttle, providing resistance to the extraction of the bobbin thread that is guided out between the clamping plate and the clamping spring. Above the inner shuttle is a needle plate with an opening for the bobbin thread to enter and exit. The needle plate has a guide slit for guiding the bobbin thread, which is formed in a generally straight line in the extension direction of the overlapping part of the clamping plate and the clamping spring.

[0004] This type of bobbin thread supply device involves pulling the bobbin along a straight guide slit and then cutting it with a thread cutter to maintain a reasonable length, allowing the sewing machine to sew directly by hooking the bobbin with the top thread. However, this device requires the operator to be positioned in front of the sewing machine and pull the bobbin diagonally backward before cutting, obstructing their view and making thread pulling and cutting inconvenient. Furthermore, the bobbin, embedded in the guide slit, is not obstructed, leading to issues such as loose bobbin protruding above the needle plate, snagging on the fabric, tangling, or even damage, thus reducing the stability of the bobbin thread supply device. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a sewing machine bobbin supply structure. The technical problem solved is how to make bobbin placement convenient and improve the stability of the bobbin supply structure.

[0006] The objective of this utility model can be achieved through the following technical solution: a sewing machine bobbin thread supply structure, the sewing machine including a needle plate and a cover plate, the front end of the needle plate having a clearance opening for the bobbin to pass through, the cover plate being detachably disposed at the front end of the needle plate, characterized in that the bobbin thread supply structure includes a guide seam and a thread cutter located at the front end of the needle plate, one end of the guide seam being connected to the clearance opening, the other end being provided with the thread cutter, and the cover plate being located directly above the clearance opening, the guide seam and the thread cutter.

[0007] In use, insert the bobbin into the sewing machine through the clearance opening, pull out the bobbin thread, and position it along the guide seam. Finally, cut the bobbin with the thread cutter. The front of the needle plate is close to the operator, meaning the guide seam and thread cutter are closer to the operator, eliminating any obstruction of view and making bobbin placement convenient. Then, close the cover plate, which is located directly above the clearance opening, guide seam, and thread cutter. The cover plate will shield the bobbin thread, preventing it from getting caught on the fabric and ensuring that the bobbin thread can be lifted by the top thread, thus improving the stability of the bobbin supply structure.

[0008] In the above-described sewing machine bobbin supply structure, the guide seam is located to the left of the clearance opening. The guide seam's location aligns with the position of the bobbin thread end and conforms to the operator's operating habits, making bobbin placement convenient.

[0009] In the above-described sewing machine bobbin thread supply structure, the guide seam is curved or zigzag-shaped. The guide seam can be S-shaped or L-shaped, etc. This structure, compared to a straight line, can extend the length of the guide seam, ensuring sufficient length within a smaller area.

[0010] In the above-described sewing machine bobbin thread supply structure, the front end of the needle plate has a first reversing block and a second reversing block, which are spaced apart. The guide seam is arranged along the sidewalls of the first and second reversing blocks, and the top surfaces of the first and second reversing blocks are both located below the top surface of the needle plate in the vertical direction. This structure facilitates the formation of the guide seam through the first and second reversing blocks, and the arrangement of the first and second reversing blocks does not affect the installation of the cover plate.

[0011] In the above-described sewing machine bobbin thread supply structure, the bottom of the cover plate has a clearance groove, and the tops of the first reversing block and the second reversing block can be embedded in the clearance groove. Since the needle plate and cover plate are relatively thin, the clearance groove provides some space in the height direction, making the structure of the cover plate and needle plate more compact.

[0012] In the above-described sewing machine bobbin supply structure, the top surface of the first reversing block has a first directional line, and the top surface of the second reversing block has a second directional line. Both the first and second directional lines serve as guides, clearly indicating to the operator how to place the bobbin, thus facilitating bobbin placement.

[0013] In the above-described sewing machine bobbin supply structure, the top surface of the needle plate is flush with the top surface of the cover plate.

[0014] In the aforementioned sewing machine bobbin thread supply structure, the cover plate is transparent, allowing clear visibility of whether the bobbin thread is properly positioned.

[0015] Compared with the prior art, the sewing machine bobbin supply structure provided by this utility model has the following advantages:

[0016] 1. The bottom thread supply structure is located on the left side of the front end of the needle plate. When placing the bottom thread, there is no problem of the operator's line of sight being blocked, and it conforms to the operator's operating habits, making the placement of the bottom thread convenient.

[0017] 2. The bottom line supply structure can cover the bottom line with a cover plate to prevent it from being caught on the sewing material, thus ensuring that the bottom line can be hooked up by the top thread and improving the stability of the bottom line supply structure. Attached Figure Description

[0018] Figure 1 This is an exploded view of the needle plate and cover plate of this sewing machine.

[0019] Figure 2 This is a schematic diagram of the bobbin supply structure of this sewing machine.

[0020] Figure 3 This is a schematic diagram of the bottom surface of the sewing machine cover.

[0021] In the diagram, 1 is the needle plate; 2 is the cover plate; 3 is the clearance opening; 4 is the guide seam; 5 is the thread cutter; 6 is the first reversing block; 7 is the second reversing block; 8 is the clearance groove; 9 is the first pointing line; and 10 is the second pointing line. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the sewing machine includes a needle plate 1, a cover plate 2, and a bobbin supply structure.

[0024] The bobbin thread supply structure includes a guide seam 4 and a thread cutter 5 located at the front end of the needle plate 1. The front end of the needle plate 1 has a clearance opening 3 for the bobbin to pass through. The guide seam 4 is located to the left of the clearance opening 3, with one end connected to the clearance opening 3 and the other end equipped with the thread cutter 5. In this embodiment, the guide seam 4 is curved, for example, S-shaped. In actual production, the guide seam 4 can be zigzag-shaped, for example, Z-shaped.

[0025] like Figure 2 As shown, the front end of the needle plate 1 has a first reversing block 6 and a second reversing block 7, which are spaced apart. The guide seam 4 is arranged along the sidewalls of the first reversing block 6 and the second reversing block 7. The top surfaces of the first reversing block 6 and the second reversing block 7 are both located below the top surface of the needle plate 1 in the vertical direction. The top surface of the first reversing block 6 has a first pointing line 9, and the top surface of the second reversing block 7 has a second pointing line 10.

[0026] The cover plate 2 is transparent and detachably mounted on the front end of the needle plate 1. The cover plate 2 is located directly above the clearance opening 3, the guide seam 4, and the suture cutter 5. The top surface of the needle plate 1 is flush with the top surface of the cover plate 2. Figure 3 As shown, the bottom of the cover plate 2 has a clearance groove 8, and the tops of the first reversing block 6 and the second reversing block 7 can be embedded in the clearance groove 8.

[0027] When using, insert the bobbin into the sewing machine through the clearance opening 3, pull out the bottom thread, place the bottom thread along the guide seam 4, and finally cut it with the thread cutter 5, and then cover it with the cover plate 2.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0029] Although this document frequently uses terms such as needle plate 1, cover plate 2, clearance opening 3, guide seam 4, thread cutter 5, first reversing block 6, second reversing block 7, clearance groove 8, first pointing line 9, and second pointing line 10, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A bobbin thread supply structure for a sewing machine, the sewing machine comprising a needle plate (1) and a cover plate (2), wherein the front end of the needle plate (1) has a clearance opening (3) for the bobbin to pass through, and the cover plate (2) is detachably disposed at the front end of the needle plate (1), characterized in that, The bottom line supply structure includes a guide seam (4) and a cutting knife (5) located at the front end of the needle plate (1). One end of the guide seam (4) is connected to the relief opening (3), and the other end is provided with the cutting knife (5). The cover plate (2) is located directly above the relief opening (3), the guide seam (4), and the cutting knife (5).

2. The sewing machine bobbin supply structure according to claim 1, characterized in that, The guide seam (4) is located to the left of the clearance opening (3).

3. The sewing machine bobbin supply structure according to claim 1, characterized in that, The guide seam (4) is curved or zigzag.

4. A sewing machine bobbin supply structure according to claim 1, 2, or 3, characterized in that, The front end of the needle plate (1) has a first reversing block (6) and a second reversing block (7), the first reversing block (6) and the second reversing block (7) are spaced apart, the guide seam (4) is arranged along the side wall of the first reversing block (6) and the second reversing block (7), and the top surface of the first reversing block (6) and the top surface of the second reversing block (7) are both located below the top surface of the needle plate (1) in the vertical direction.

5. The sewing machine bobbin supply structure according to claim 4, characterized in that, The bottom of the cover plate (2) has a clearance groove (8), and the tops of the first reversing block (6) and the second reversing block (7) can be embedded in the clearance groove (8).

6. The sewing machine bobbin supply structure according to claim 4, characterized in that, The top surface of the first commutator block (6) has a first pointing line (9), and the top surface of the second commutator block (7) has a second pointing line (10).

7. A sewing machine bobbin supply structure according to claim 1, 2, or 3, characterized in that, The top surface of the needle plate (1) is flush with the top surface of the cover plate (2).

8. A sewing machine bobbin supply structure according to claim 1, 2, or 3, characterized in that, The cover plate (2) is transparent.

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