Thread tension management device for a sewing machine

Abstract

A bobbin thread surplus management device for a sewing machine, comprising a comparison unit, a winding unit for recording the winding turns of a bobbin, and a thread releasing unit for detecting the thread releasing turns of the bobbin, the comparison unit is used for comparing the thread releasing turns with the winding turns to indicate the bobbin thread surplus on the bobbin; the winding unit comprises a winding motor and a winding turn detection structure, the winding motor is detachably connected with the bobbin, the winding motor drives the bobbin to rotate to wind the bobbin thread, and the winding turn detection structure detects the rotating turns of the bobbin during winding to obtain the winding turns; the thread releasing unit comprises a bobbin shell and a thread releasing turn detection structure, the bobbin with the wound bobbin thread is rotatably sleeved and installed in the bobbin shell to release the bobbin thread, and the thread releasing turn detection structure detects the rotating turns of the bobbin during releasing the bobbin thread to obtain the thread releasing turns; the bobbin thread surplus management device realizes a new bobbin thread surplus management technical scheme.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a bobbin thread allowance management 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, providing a reminder of the remaining bobbin thread would be of great help to workers. Existing technologies have explored how to implement this bobbin thread balance reminder. For example, the sewing machine bobbin thread detection device disclosed in patent announcement number CN223409850U includes a detection motor for bobbin 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 bobbin 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 relies on the accuracy of the detection motor itself.

[0003] This application proposes a bottom thread margin management device for sewing machines, realizing a new bottom thread margin management technical solution. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a bottom thread allowance management device for sewing machines, thereby realizing a new bottom thread allowance management technical solution.

[0005] The technical solution of this utility model is: a bobbin thread allowance management device for sewing machines, including a comparison unit, a winding unit for recording the number of loops wound on the bobbin, and a thread exiting unit for detecting the number of loops exited from the bobbin. The comparison unit is used to compare the number of loops exited with the number of loops wound to indicate the bobbin thread allowance.

[0006] The winding unit includes a winding motor and a winding coil detection structure. The winding motor is detachably connected to the bobbin. The winding motor drives the bobbin to rotate to wind the bobbin thread. The winding coil detection structure detects the number of rotations of the bobbin during winding to obtain the winding coil count.

[0007] The bobbin case includes a bobbin case and a bobbin thread count detection structure. The bobbin with the bottom thread wound can be rotatably fitted into the bobbin case to release the bottom thread. The bobbin thread count detection structure detects the number of rotations of the bobbin when the bottom thread is released to obtain the number of bobbin threads.

[0008] With the above structure, this utility model has the following advantages: In this disclosure, a winding unit and a lead-out unit are respectively set for the winding and lead-out of the bobbin, and a comparison unit is used to compare the number of lead-out turns with the number of winding turns to indicate the bottom thread allowance on the bobbin, thereby realizing a new bottom thread allowance management technology solution.

[0009] In particular, focusing the inspection on the bobbin helps to minimize the impact of various factors on accuracy, such as wire diameter, wire length, and speed difference, thereby significantly improving the accuracy and reliability of bottom line allowance management.

[0010] In some embodiments, a display is also included for showing comparison results to indicate the baseline margin.

[0011] In some embodiments, an audible alarm device is also included to alert users of the baseline margin.

[0012] In some embodiments, the loop count detection structure includes a light source part and a light-sensing part. The bobbin has a light-sensing surface, and the bobbin case has a notch facing the light source part and the light-sensing part. 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.

[0013] In some embodiments, the winding coil count detection structure includes a sensor disposed on the winding motor, which indirectly detects the winding coil count by detecting the number of rotations of the winding motor.

[0014] 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.

[0015] 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.

[0016] In some embodiments, an input unit is further included, which is used to set the number of turns of the winding unit. Attached image description: Figure 1 This is a three-dimensional schematic diagram of a bottom thread allowance management device for a sewing machine from a frontal view.

[0017] Figure 2 This is a three-dimensional schematic diagram of a bottom thread allowance management device for a sewing machine from a rear view.

[0018] Figure 3 This is a perspective view of a bobbin case side view of a bobbin case device for managing bottom thread allowance in a sewing machine disclosed herein.

[0019] Figure 4 This is an enlarged 3D schematic diagram of A.

[0020] Figure 5 This is a three-dimensional schematic diagram of a bottom thread allowance management device for a sewing machine, viewed from the light source and light sensor sides.

[0021] Figure 6 This is a three-dimensional schematic diagram of the bobbin rotatably mounted in the bobbin case, viewed from one side of the notch.

[0022] Figure 7 This is a three-dimensional schematic diagram of the bobbin rotatably mounted in the bobbin case, viewed from the non-notch side.

[0023] Figure 8 This is a three-dimensional schematic diagram of a shuttle shell disclosed herein.

[0024] Figure 9 This is a three-dimensional schematic diagram of a bobbin.

[0025] Figure 10 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).

[0026] 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-Winding groove, 14-Support shaft, 15-Socket shaft, 16-Winding motor, 17-Display, 18-Sound alarm device, 19-Input unit. Detailed Implementation

[0027] 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.

[0028] like Figures 1 to 10 As shown, this disclosure proposes a bobbin thread allowance management device for a sewing machine, including a comparison unit, a winding unit for recording the number of loops wound on the bobbin 1, and a thread exit unit for detecting the number of loops exited from the bobbin 1. The comparison unit is used to compare the number of loops exited with the number of loops wound to indicate the bobbin thread allowance on the bobbin 1.

[0029] The winding unit includes a winding motor 16 and a winding coil detection structure. The winding motor 16 is detachably connected to the bobbin 1. The winding motor 16 drives the bobbin 1 to rotate to wind the bobbin thread. The winding coil detection structure detects the number of rotations of the bobbin 1 during winding to obtain the winding coil number.

[0030] The yarn exit unit includes a bobbin case 2 and a yarn exit count detection structure. The bobbin 1 with the bottom thread wound can be rotatably fitted into the bobbin case 2 to release the bottom thread. The yarn exit count detection structure detects the number of rotations of the bobbin 1 when the bottom thread is released to obtain the number of yarn exits.

[0031] A centralized control structure is preferred, for example, a single-chip microcomputer is set up. This single-chip microcomputer is electrically connected to the winding coil count detection structure and the output coil count detection structure respectively. The comparison unit is set in the single-chip microcomputer. Utilizing the computing power of the single-chip microcomputer, on the one hand, the winding coil count and the output coil count are calculated respectively, and on the other hand, the winding coil count and the output coil count are compared to indicate the bottom line margin on the bobbin 1.

[0032] When using this disclosure, the bobbin 1 is first installed on the winding motor 16 for winding, and then the bobbin 1 is removed and installed in the bobbin case 2 to release the bobbin thread. In this way, when the bobbin thread is released, the bobbin 1 will rotate to generate the number of loops, thereby obtaining the number of loops. The bobbin thread allowance can be determined by comparing this number of loops with the total number of winding loops, which is convenient for workers to use.

[0033] like Figure 1 As shown, it also includes a display 17, which displays the comparison results to indicate the baseline margin. This makes the indication convenient and intuitive, and easy for workers to use.

[0034] like Figure 2 As shown, it also includes an audible alarm device 18 for alerting the worker about the bobbin thread allowance. The audible alarm device 18 is, for example, a horn. This makes it easier for workers to understand the bobbin thread allowance, thus benefiting their sewing work.

[0035] like Figure 1 As shown, it also includes an input unit 19, which is used to set the number of turns of the winding unit. This makes it easier for workers to set the amount of yarn, thereby benefiting the sewing work and reducing waste.

[0036] In this example, input unit 19 uses button input. The up and down arrow keys are used for incrementing and decrementing operations, while the left and right arrow keys are used for function selection and confirmation. Of course, combined with the microcontroller, each button can be customized with more functions, such as setting the alarm volume, setting the alarm time based on the cycle difference, setting the display brightness, and enabling or disabling the sound alarm, etc.

[0037] In addition to keypad input, touch input can also be used.

[0038] In some embodiments, the winding coil count detection structure includes a sensor disposed on the winding motor 16, which indirectly detects the winding coil count by detecting the number of rotations of the winding motor 16. This structure is simple and facilitates fast winding. For example, a Hall effect sensor is used to detect the rotational speed of the winding motor 16.

[0039] In some embodiments, such as Figures 3 to 9 As shown, the coil count detection structure includes a light source part 3 and a light-sensing part 4. The bobbin 1 is provided with a light-sensing surface 6, and 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 from the light source part 3 shines on the light-sensing surface 6 through the notch 5, and the reflected light from 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. In this way, when the bobbin 1 rotates multiple times, the light-sensing part 4 can detect it multiple times.

[0040] Since the rotation of the bobbin 1 is detected by a non-contact light-sensing component, the rotation state of the bobbin 1 is directly detected. Therefore, there is no mechanical interference between the light-sensing component 6 and the bobbin 1, which helps to improve the detection accuracy.

[0041] In particular, the rotation speed of bobbin 1 is only related to the sewing speed, which is variable. However, after adopting the above scheme, this speed change has virtually no impact on the detection accuracy.

[0042] In particular, the present disclosure utilizes the related structures of the bobbin 1 and the bobbin case 2 to form the components of the present disclosure, with minimal changes to the existing structure of the sewing machine. The main modifications required are the addition of a light source part 3 and a light-sensing part 4, as well as the further provision of a light-sensing surface 6 on the bobbin 1.

[0043] 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.

[0044] 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.

[0045] In some embodiments, such as Figure 4 , 5 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.

[0046] In some embodiments, such as Figure 4 , 5 As 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.

[0047] In some embodiments, such as Figure 4 , 6 As shown in Figures 7 and 8, 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.

[0048] In some embodiments, such as Figure 9 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.

[0049] Furthermore, such as Figure 6 , 7 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.

[0050] In some embodiments, such as Figure 4 , 10 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.

[0051] 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.

[0052] 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 device for managing the bobbin thread allowance in a sewing machine, characterized in that, It includes a comparison unit, a winding unit for recording the number of turns wound on the bobbin (1), and a threading unit for detecting the number of turns out of the bobbin (1). The comparison unit is used to compare the number of turns out with the number of turns wound to indicate the bottom thread allowance on the bobbin (1). The winding unit includes a winding motor (16) and a winding coil detection structure. The winding motor (16) is detachably connected to the bobbin (1). The winding motor (16) drives the bobbin (1) to rotate to wind the bottom thread. The winding coil detection structure detects the number of rotations of the bobbin (1) during winding to obtain the winding coil number. The lead-out unit includes a bobbin case (2) and a lead-out coil count detection structure. The bobbin (1) with the bottom thread wound can be rotatably fitted into the bobbin case (2) to release the bottom thread. The lead-out coil count detection structure detects the number of rotations of the bobbin (1) when the bottom thread is released to obtain the lead-out coil count.

2. The bobbin thread allowance management device for a sewing machine according to claim 1, characterized in that, It also includes a display (17) for displaying comparison results to indicate the baseline margin.

3. A bobbin thread allowance management device for a sewing machine according to claim 1 or 2, characterized in that, It also includes an audible alarm device (18) for alerting the bottom line margin.

4. The bobbin thread allowance management device for a sewing machine according to claim 1, characterized in that, The coil count detection structure includes a light source part (3) and a light sensing part (4). The bobbin (1) is provided with a light sensing surface (6), and 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 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.

5. A bobbin thread allowance management device for a sewing machine according to claim 1 or 4, characterized in that, The winding coil count detection structure includes a sensor located on the winding motor (16), which indirectly detects the winding coil count by detecting the number of rotations of the winding motor (16).

6. A bobbin thread allowance management device for a sewing machine according to claim 4, 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).

7. A bobbin thread allowance management device for a sewing machine according to claim 6, 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).

8. A bobbin thread allowance management device for a sewing machine according to claim 1, characterized in that, It also includes an input unit (19) for setting the number of turns of the winding unit.

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