A bobbin thread detection device for a sewing machine

Abstract

A bobbin thread detection device for sewing machine, comprising a bobbin (1), a bobbin case (2), a light source part (3) and a light sensing part (4), the bobbin (1) is used to wind the bobbin thread, the bobbin (1) is rotatably sleeved in the bobbin case (2) to release the bobbin thread, the bobbin (1) is provided with a light sensing surface (6), the bobbin case (2) is provided with a notch (5), the notch (5) faces the light source part (3) and the light sensing part (4), the light emitted by the light source part (3) is irradiated on the light sensing surface (6) through the notch (5), the reflection of the light sensing surface (6) is irradiated to the light sensing part (4) through the notch (5), the light sensing part (4) detects once when the light sensing surface (6) passes through the notch (5) once per rotation of the bobbin (1); the bobbin thread detection device realizes a new bobbin thread detection technical scheme, and the structure is relatively simple.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a bottom thread detection device for sewing machines. Background Technology

[0002] Bottom thread is an essential component of sewing, used in large quantities, and plays a crucial role in ensuring sewing quality. Therefore, requirements for controlling and measuring the amount of bottom thread have been proposed. For example, a sewing machine bottom thread detection device disclosed in authorization announcement number CN223409850U includes a detection motor for bottom thread winding, a controller electrically connected to the detection motor, and a display screen. The controller can monitor the number of rotations of the detection motor in real time and display the monitored number of rotations on the display screen. Although it can detect the amount of bottom thread used in real time and display it intuitively for easy observation by the user, and has the characteristics of simple and practical structure, it depends on the accuracy of the detection motor itself.

[0003] This application proposes a bottom thread detection device for sewing machines, realizing a new bottom thread detection technology solution with a relatively simple structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a bottom thread detection device for sewing machines, realize a new bottom thread detection technology solution, and have a relatively simple structure.

[0005] The technical solution of this utility model is: a bobbin thread detection device for a sewing machine, including a bobbin, a bobbin case, a light source part, and a light-sensing part. The bobbin is used to wind the bobbin thread. The bobbin is rotatably fitted into the bobbin case to release the bobbin thread. The bobbin has a light-sensing surface, and the bobbin case has a notch facing the light source part and the light-sensing part. The light emitted from the light source part shines on the light-sensing surface through the notch, and the reflection from the light-sensing surface shines on the light-sensing part through the notch. Each time the bobbin rotates, the light-sensing surface passes through the notch once, and the light-sensing part detects it once.

[0006] With the above structure, this utility model has the following advantages: In this disclosure, the rotation of the bobbin is detected by a non-contact light-sensing component. Specifically, each time the bobbin rotates, the light-sensing surface passes through the notch once, and the light-sensing component detects it once. This makes the rotation count of the bobbin more accurate, thereby realizing a new bottom line detection technology solution with a relatively simple structure.

[0007] In addition, since the rotation of the bobbin is detected by a non-contact light sensor, the rotation state of the bobbin is directly detected. Therefore, there is no mechanical interference between the light sensor and the bobbin, which helps to improve the detection accuracy.

[0008] In particular, the spindle speed is only related to the sewing speed, which varies. However, with the above method, this speed variation has virtually no impact on the detection accuracy.

[0009] In particular, the present disclosure utilizes the related structures of the bobbin and the bobbin case to form part of the present disclosure, and the changes to the existing structure of the sewing machine are minimal. The main changes required are the addition of a light source and a light-sensing part, as well as the further addition of a light-sensing surface to the bobbin.

[0010] In some embodiments, the light source portion and the light-sensing portion are located on the same side of the notch, and the light source portion and the light-sensing portion are arranged side by side.

[0011] In some embodiments, the light source portion and the light-sensing portion are located on the bottom surface of the sewing machine and on one side of the bottom thread outlet hole.

[0012] In some embodiments, the shuttle housing is provided with an axially arranged wire exit groove, which forms an opening at the end of the shuttle housing, the opening serving as a notch.

[0013] In some embodiments, the bobbin includes a shaft and baffles at both ends of the shaft, with a winding groove formed between the baffles at both ends, and a light-sensitive surface disposed on the outer surface of the baffles.

[0014] In some embodiments, when the bobbin is rotatably fitted in the bobbin case, the outer side of the baffle abuts against the end of the bobbin case and is adjacent to a notch located at that end. Attached image description: Figure 1 This is a three-dimensional schematic diagram of a bobbin case side view of a bobbin case detection device for a sewing machine disclosed herein.

[0015] Figure 2 This is an enlarged 3D schematic diagram of A.

[0016] Figure 3 This is a three-dimensional schematic diagram of a bottom thread detection device for a sewing machine, viewed from the light source and light sensor sides.

[0017] Figure 4 This is a three-dimensional schematic diagram of the bobbin rotatably mounted in the bobbin case, viewed from one side of the notch.

[0018] Figure 5 This is a three-dimensional schematic diagram of the bobbin rotatably mounted in the bobbin case, viewed from the non-notch side.

[0019] Figure 6 This is a three-dimensional schematic diagram of a shuttle shell disclosed herein.

[0020] Figure 7 This is a three-dimensional schematic diagram of a bobbin.

[0021] Figure 8 This is a three-dimensional schematic diagram showing the support shaft exposed after the shuttle case (the shuttle core is removed along with the shuttle case).

[0022] The diagram shows: 1-Bobbin, 2-Bobbin case, 3-Light source part, 4-Light sensor part, 5-Notch, 6-Light sensor surface, 7-Sewing machine, 8-Bottom surface, 9-Bottom thread outlet hole, 10-Thread outlet groove, 11-Shaft, 12-Baffle, 13-Thread winding groove, 14-Support shaft, 15-Socket shaft. Detailed Implementation

[0023] To better understand this application, various aspects of this application will be described in more detail below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0024] like Figures 1 to 8 As shown, this disclosure proposes a bobbin thread detection device for a sewing machine, including a bobbin 1, a bobbin case 2, a light source part 3, and a light-sensing part 4. The bobbin 1 is used to wind the bobbin thread. The bobbin 1 is rotatably fitted in the bobbin case 2 to release the bobbin thread. The bobbin 1 has a light-sensing surface 6. The bobbin case 2 has a notch 5. The notch 5 faces the light source part 3 and the light-sensing part 4. The light emitted from the light source part 3 shines on the light-sensing surface 6 through the notch 5. The reflection from the light-sensing surface 6 shines on the light-sensing part 4 through the notch 5. Each time the bobbin 1 rotates, the light-sensing surface 6 passes through the notch 5 once, and the light-sensing part 4 detects it once. In this way, when the bobbin 1 rotates multiple times, the light-sensing part 4 can detect it multiple times.

[0025] The light source part 3 and the light sensing part 4 can adopt existing technologies. For example, the light source part 3 can be a light source circuit built with LED beads, and the light sensing part 4 can be a light detection circuit built with a photoresistor. The photoresistor detects the reflection of the light sensing surface 6 and sends an electrical signal to a controller such as a microcontroller to realize the rotation counting of the bobbin 1. The microcontroller is existing technology and will not be described in detail here.

[0026] A light-sensitive surface 6 is a reflective surface or a surface that can emit ultraviolet light or other wavelengths of light when exposed to light.

[0027] In some embodiments, such as Figure 2 , 3 As shown, the light source part 3 and the light sensing part 4 are located on the same side of the notch 5, and the light source part 3 and the light sensing part 4 are arranged side by side. In this way, the structure is more compact and it is also beneficial for detection.

[0028] In some embodiments, such as Figure 2 , 3As shown, the light source part 3 and the light-sensing part 4 are located on the lower bottom surface 8 of the sewing machine 7, and on one side of the thread outlet hole 9. This design facilitates a compact structure, makes thread outlet easier, and shortens the thread path.

[0029] In some embodiments, such as Figure 2 , 4 As shown in Figures 5 and 6, the shuttle housing 2 is provided with an axially arranged wire outlet groove 10, which forms an opening at the end of the shuttle housing 2, serving as a notch 5. This further simplifies the structure and makes the present disclosure more practical.

[0030] In some embodiments, such as Figure 7 As shown, the bobbin 1 includes a shaft 11 and baffles 12 at both ends of the shaft 11. The baffles 12 at both ends form a winding groove 13, and the photosensitive surface 6 is disposed on the outer surface of the baffles 12. In this way, the bobbin 1 does not need to be significantly modified. Instead, the photosensitive surface 6 is added to the outer surface of the baffles 12, which means that the bobbin 1 can be directly modified. This not only facilitates the manufacturing of the bobbin 1, but also makes the structure simpler and more compact, and can form a good fit with the bobbin case 2 to achieve the detection purpose.

[0031] Furthermore, such as Figure 4 , 5 As shown, when the bobbin 1 is rotatably fitted into the bobbin case 2, the outer side of the baffle 12 approaches the end of the bobbin case 2 and is adjacent to the notch 5 located at that end. In this way, on the one hand, the structure is compact, and on the other hand, importantly, it can maintain the worker's original usage habits, that is, after the present invention is added to the sewing machine, the worker can quickly adapt.

[0032] In some embodiments, such as Figure 2 , 8 As shown, when the bobbin 1 is rotatably sleeved in the bobbin case 2 to form a whole, specifically, the bobbin 11 is rotatably sleeved with the bobbin case 2's sleeve shaft 15, and the whole is then inserted into the support shaft 14 via the sleeve shaft 15. In this way, on the one hand, the whole is well supported, and it is convenient for workers to use. On the other hand, the bobbin 1 is well supported by the bobbin case 2, which allows the bobbin 1 to rotate better, thus facilitating the counting of the rotation of the bobbin 1.

[0033] When understanding this utility model, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that is understood, so I will not elaborate further here.

[0034] The above description is merely an illustrative embodiment of this utility model. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of this utility model are included within the scope of protection of this utility model.

Claims

1. A thread detection device for a sewing machine, characterized in that, It includes a bobbin (1), a bobbin case (2), a light source part (3) and a light-sensing part (4). The bobbin (1) is used to wind the bobbin thread. The bobbin (1) is rotatably fitted in the bobbin case (2) to release the bobbin thread. The bobbin (1) has a light-sensing surface (6). The bobbin case (2) has a notch (5). The notch (5) faces the light source part (3) and the light-sensing part (4). The light emitted from the light source part (3) shines on the light-sensing surface (6) through the notch (5). The reflection of the light-sensing surface (6) shines on the light-sensing part (4) through the notch (5). Every time the bobbin (1) rotates, the light-sensing surface (6) passes through the notch (5) once, and the light-sensing part (4) detects it once.

2. The thread detection device for a sewing machine according to claim 1, characterized in that, The light source part (3) and the light sensing part (4) are located on the same side of the notch (5), and the light source part (3) and the light sensing part (4) are arranged side by side.

3. A thread detection device for a sewing machine according to claim 1 or 2, characterized in that, The light source part (3) and the light sensing part (4) are located on the bottom surface (8) of the sewing machine (7) and on one side of the bottom thread outlet hole (9).

4. The thread detection device for a sewing machine according to claim 1, characterized in that, The shuttle (2) is provided with an axially arranged wire outlet groove (10), which forms an opening at the end of the shuttle (2) as a notch (5).

5. A thread detection device for a sewing machine according to claim 1 or 4, characterized in that, The bobbin (1) includes a shaft (11) and baffles (12) at both ends of the shaft (11). The baffles (12) at both ends form a winding groove (13), and the light-sensitive surface (6) is set on the outer surface of the baffle (12).

6. The thread detection device for a sewing machine according to claim 5, characterized in that, When the bobbin (1) is rotatably fitted into the bobbin case (2), the outer side of the baffle (12) approaches the end of the bobbin case (2) and is adjacent to the notch (5) located at that end.

Images