Sewing machine

Abstract

The utility model relates to a sewing machine which comprises a shuttle peg, an elastic piece and a detection device. The shuttle peg is arranged on the machine body and can rotate in the axial direction of the machine body, and a strip-shaped hole is formed in the first panel; the elastic piece is sleeved on the shuttle core shaft and is provided with a claw-shaped part which extends into the strip-shaped hole to be movably arranged and is used for winding a bottom thread; the detection end of the detection device is arranged towards the first panel of the bobbin case, emits a detection signal, and judges the state of the bottom line by receiving a signal reflected by the claw-shaped part or the panel. Through cooperation of the strip-shaped hole in the shuttle peg and the claw-shaped part on the elastic piece, the technical problem that in the prior art, when the sewing machine bottom line allowance is detected, the detection accuracy is low due to light reflection of the material of the shuttle peg is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field especially relates to a sewing machine. BACKGROUND

[0002] At present, with the continuous progress of sewing technology and the significant improvement of automation degree, sewing machine plays a vital role in the textile, garment manufacturing and other industries. In order to ensure the continuity of sewing operation and product quality, real-time monitoring of the bottom line allowance, ensuring timely replacement, has become an indispensable function of automatic sewing machine. Laser sensor is widely used in the detection of sewing machine bottom line allowance due to its non-contact detection, fast response and high precision. By emitting laser and receiving reflected signal, laser sensor can accurately measure the remaining amount of bottom line in the bobbin core, so as to effectively avoid the interruption of sewing caused by the depletion of bottom line.

[0003] However, in practical application, the accuracy of laser sensor is challenged by the light reflection characteristics of bobbin material. As a component for storing bottom line in sewing machine, the surface material of bobbin often has certain light reflection. Although this light reflection can help laser sensor to detect to some extent, in the process of bottom line consumption, with the decrease of line amount in the bobbin core, the probability of laser directly irradiating to the surface of bobbin increases, which further leads to the fluctuation of reflected signal intensity. When the reflected signal intensity received by laser sensor changes not obviously, it is difficult to accurately judge whether the bottom line is about to be depleted, which directly affects the efficiency and reliability of automatic control of sewing machine. Therefore, how to overcome the influence of light reflection of bobbin material on laser sensor detection of bottom line allowance without affecting the detection accuracy has become a technical problem to be solved. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a sewing machine, so as to solve the technical problem of low detection accuracy caused by the light reflection of bobbin material in the detection of bottom line allowance of sewing machine in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present application, a sewing machine is provided, comprising a machine body, the sewing machine comprising: a bobbin, the bobbin being arranged on the machine body and being rotatably arranged about an axial direction; the bobbin comprising a first panel, a second panel and a bobbin shaft, the first panel and the second panel being respectively arranged at two ends of the bobbin shaft, and a strip-shaped hole extending along a radial direction of the bobbin being arranged on the first panel; the first panel being arranged at one end of the bobbin close to the machine body; an elastic member, the elastic member being sleeved on the bobbin shaft, the elastic member having a claw-shaped part movably arranged, at least a part of the claw-shaped part extending into the strip-shaped hole, the claw-shaped part being movably arranged in the strip-shaped hole along the radial direction of the bobbin, so as to wind a bottom thread on the bobbin; and a detection device, a detection end of the detection device being arranged towards the first panel of the bobbin case, so as to emit a detection signal towards the strip-shaped hole, so that when a monitoring signal emitted back by the claw-shaped part is received, it is judged that the bottom thread needs to be replaced, and when a signal reflected back by the first panel or the second panel is received, it is judged that the bottom thread does not need to be replaced.

[0006] Further, the detection device further comprises: a reflecting member, the reflecting member being arranged in the strip-shaped hole and being connected with the claw-shaped part, so that the claw-shaped part drives the reflecting member to move.

[0007] Further, the reflecting member is a circular reflecting sticker, the reflecting sticker being arranged at an end of the claw-shaped part, and an axis of the reflecting sticker being parallel to an axis of the bobbin.

[0008] Further, the sewing machine further comprises: a bobbin case, the bobbin case being arranged on the machine body, the bobbin case having an inner casing body for forming a containing cavity and an outer casing body covering outside of the inner casing body, and the bobbin being rotatably arranged in the containing cavity; wherein, the inner casing body is provided with an observation hole, and the outer casing body is provided with an avoiding cutout, the observation hole being arranged corresponding to the strip-shaped hole, so that when the avoiding cutout, the observation hole and the strip-shaped hole are in a relative arrangement position, the signal reflected back by the claw-shaped part, the first panel or the second panel is used to judge a state of the bottom thread.

[0009] Further, the bobbin shaft comprises a first bobbin shaft and a second bobbin shaft arranged coaxially, the first bobbin shaft being arranged at a side of the second bobbin shaft close to the second panel, a diameter of the first bobbin shaft being smaller than a diameter of the second bobbin shaft, and at least a part of the elastic member being sleeved on the first bobbin shaft and the second bobbin shaft respectively.

[0010] Further, the elastic member further comprises a ring-shaped part, the ring-shaped part being sleeved on the bobbin shaft, one end of the claw-shaped part being connected with the ring-shaped part, and the other end of the claw-shaped part extending into the strip-shaped hole.

[0011] Further, the annular part is sleeved on the first bobbin shaft, the claw-shaped part comprises: a first step part, the first step part is arranged on one end of the annular part close to the second bobbin shaft along the radial direction of the bobbin shaft and at least partially protrudes from the second bobbin shaft; a second step part, the second step part is arranged in the strip-shaped hole; and a bevel part, one end of the bevel part is connected with the second step part, and the other end of the bevel part is rotatably connected with the second step part around a predetermined rotation axis, so as to drive the second step part to move along the radial direction of the bobbin shaft, and the predetermined rotation axis is perpendicular to the bobbin shaft line.

[0012] Further, the elastic member comprises a plurality of claw-shaped parts, the plurality of claw-shaped parts are arranged at intervals along the circumference of the annular part, and a plurality of strip-shaped holes are arranged on the first panel in one-to-one correspondence with the plurality of claw-shaped parts.

[0013] Further, the annular part further comprises a first clamping part and a second clamping part, the first clamping part and the second clamping part are arranged at two ends of the annular part along the axial direction of the bobbin respectively, a clamping hole is arranged on the first panel, at least part of the first clamping part protrudes into the clamping hole to be clamped and matched with the first panel, a groove extending along the axial direction of the bobbin is arranged on the second bobbin shaft, and the second clamping part protrudes into the groove to be clamped and matched with the bobbin shaft.

[0014] Further, the sewing machine further comprises a control module, the detection device is a reflective laser sensor, the laser emitted by the reflective laser sensor is arranged corresponding to the strip-shaped hole, so that the reflective laser sensor collects the laser reflected by the claw-shaped part or the second panel and generates a reflection signal, and the control module is signal connected with the reflective laser sensor, so as to judge the state of the bottom thread through the reflection signal.

[0015] The application of the technical scheme of the utility model, the strip-shaped hole on the bobbin and the claw-shaped part on the elastic member are the key to solve the problem of light reflection of the bobbin material of the utility model. When the bottom thread is wound on the bobbin, the claw-shaped part of the elastic member will produce corresponding elastic deformation due to the different thread amounts, resulting in the change of the depth of the claw-shaped part protruding into the strip-shaped hole. This cooperative mechanism ensures that as the bottom thread is consumed, the claw-shaped part can move to different positions of the strip-shaped hole, thereby changing the reflection signal intensity received by the reflective laser sensor, effectively distinguishing between the full thread state of the bobbin and the state of needing to replace the bottom thread. The elastic member is sleeved on the bobbin shaft, and the stability and position accuracy of the elastic member on the bobbin shaft are ensured through the clamping of the annular part and the bobbin shaft. The structure of the claw-shaped part enables the elastic member to automatically adjust the activity range of the claw-shaped part according to the change of the thread amount inside the bobbin during the rotation of the bobbin, thereby changing the reflection coefficient and solving the problem of inaccurate detection caused by light reflection of the bobbin material. The application solves the technical problem of low detection accuracy caused by light reflection of the bobbin material in the prior art through the cooperative matching of the strip-shaped hole on the bobbin and the claw-shaped part on the elastic member. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0017] Figure 1 Fig. 1 shows a perspective view of a bobbin and a detection device according to an embodiment of the sewing machine of the present application;

[0018] Figure 2 Fig. 2 shows a plan view of a bobbin and an elastic member according to an embodiment of the sewing machine of the present application;

[0019] Figure 3 Fig. 3 shows a perspective view of a bobbin and an elastic member according to an embodiment of the sewing machine of the present application;

[0020] Figure 4 Fig. 4 shows a perspective view of an inner housing and an outer housing according to an embodiment of the sewing machine of the present application;

[0021] Figure 5 Fig. 5 shows a perspective view of a bobbin according to an embodiment of the sewing machine of the present application;

[0022] Figure 6 Fig. 6 shows a perspective view of an elastic member according to an embodiment of the sewing machine of the present application;

[0023] Figure 7 Fig. 7 shows a perspective view of an elastic member and a reflective member according to an embodiment of the sewing machine of the present application.

[0024] In the drawings, the following reference signs are used:

[0025] 1, bobbin; 11, observation hole; 12, inner housing; 13, outer housing; 2, bobbin; 21, first panel; 211, strip-shaped hole; 212, clamping hole; 22, second panel; 221, balance hole; 23, bobbin shaft; 231, first bobbin shaft; 232, second bobbin shaft; 233, groove; 3, elastic member; 31, claw-shaped part; 311, first step part; 312, second step part; 313, inclined surface part; 32, ring-shaped part; 321, first clamping part; 322, second clamping part; 4, detection device; 5, reflective member. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] It should be noted that all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs, unless otherwise specified.

[0028] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" used herein are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0029] As shown in Figures 1 to 7 The embodiment of the present application provides a sewing machine, which comprises a machine body, the sewing machine comprises a bobbin 2, the bobbin 2 is arranged on the machine body, and the bobbin 2 is rotatably arranged around an axis thereof; the bobbin 2 comprises a first panel 21, a second panel 22 and a bobbin shaft 23, the first panel 21 and the second panel 22 are respectively arranged at two ends of the bobbin shaft 23, and the first panel 21 is provided with a strip-shaped hole 211 extending in a radial direction of the bobbin 2; the first panel 21 is arranged at one end of the bobbin 2 close to the machine body; an elastic member 3 is sleeved on the bobbin shaft 23, the elastic member 3 has a claw-shaped part 31 movably arranged, at least part of the claw-shaped part 31 extends into the strip-shaped hole 211, and the claw-shaped part 31 is movably arranged in the strip-shaped hole 211 in the radial direction of the bobbin 2, so as to be arranged around a bottom thread on the bobbin 2; and a detection device 4 is arranged at a detection end of the detection device 4, and the detection end faces the first panel 21 of the bobbin 2, so as to emit a detection signal towards the strip-shaped hole 211, so as to judge that the bottom thread needs to be replaced when a monitoring signal emitted back by the claw-shaped part 31 is received, and judge that the bottom thread does not need to be replaced when a signal reflected back by the first panel 21 or the second panel 22 is received.

[0030] The sewing machine provided by the embodiment of the present application solves the technical problem that the detection accuracy is low due to the reflection of the material of the bobbin when detecting the remaining amount of the bottom thread of the sewing machine in the prior art, through the cooperation of the strip-shaped hole 211 on the bobbin 2 and the claw-shaped part 31 on the elastic member 3.

[0031] In the above embodiment, the strip-shaped hole 211 on the bobbin 2 and the claw-shaped part 31 on the elastic member 3 are the key to solve the problem of the reflection of the bobbin material. When the bottom thread is wound on the bobbin 2, the claw-shaped part 31 of the elastic member 3 will produce corresponding elastic deformation due to the different thread amount, resulting in the change of the depth of the claw-shaped part 31 extending into the strip-shaped hole 211. This cooperative mechanism ensures that as the bottom thread is consumed, the claw-shaped part 31 can move to different positions of the strip-shaped hole 211, thereby changing the intensity of the reflected signal received by the reflective laser sensor, effectively distinguishing between the full thread state of the bobbin 2 and the state of needing to replace the bottom thread. The elastic member 3 is sleeved on the bobbin shaft 23, and is clamped with the bobbin shaft 23 through the annular part 32, which ensures the stability and position accuracy of the elastic member 3 on the bobbin shaft 23. The structure of the claw-shaped part 31 enables the elastic member 3 to automatically adjust the activity range of the claw-shaped part 31 according to the change of the thread amount inside the bobbin 2 during the rotation of the bobbin 2, thereby changing the reflection coefficient and solving the problem of inaccurate detection caused by the reflection of the bobbin material.

[0032] Specifically, as shown in Figure 2 , the detection device further comprises a reflective member 5, which is arranged in the strip-shaped hole 211 and connected with the claw-shaped part 31 so that the claw-shaped part 31 drives the reflective member 5 to move. The arrangement of the reflective member enables the detection device to more accurately capture the reflection signal of the claw-shaped part, thereby improving the sensitivity and accuracy of the monitoring.

[0033] Specifically, as shown in Figure 3 , the reflective member 5 is a circular reflective sticker, which is arranged at the end of the claw-shaped part 31, and the axis of the reflective sticker is parallel to the axis of the bobbin 2. The reflective member 5 is arranged at the end of the claw-shaped part 31, and the axis of the reflective member is parallel to the axis of the bobbin 2. This design ensures that no matter how the bobbin 2 rotates, the reflective member 5 can always accurately aim at the detection signal emitted by the detection device 4. When the bottom thread is consumed, the reflective member 5 is driven by the claw-shaped part 31 to the outermost side of the strip-shaped hole 211, at this time, the reflective member 5 has the strongest reflection ability to the laser, and the intensity of the reflected signal is significantly enhanced. The change of the reflected signal received by the detection device 4 can be accurately interpreted by the control module, and the state of needing to replace the bottom thread can be judged in time. The design of the circular reflective sticker not only can provide good reflection effect, but also can reduce the resistance to the rotation of the bobbin and reduce the friction.

[0034] Specifically, as shown in Figure 4As shown, the sewing machine further comprises a bobbin case 1, which is arranged on the machine body and has an inner casing 12 for forming a containing cavity and an outer casing 13 covering the outer side of the inner casing 12, and the bobbin core 2 is rotatably arranged in the containing cavity; wherein the inner casing 12 is provided with an observation hole 11, and the outer casing 13 is provided with an avoiding cutout 131, the observation hole 11 is arranged corresponding to the strip-shaped hole 211, so that when the avoiding cutout 131, the observation hole 11 and the strip-shaped hole 211 are in the relative arrangement position, the signal reflected by the claw-shaped part 31, the first panel 21 or the second panel 22 is used to judge the bottom thread state. The bobbin case 1 is composed of the inner casing 12 and the outer casing 13, which is designed to form a closed containing cavity, providing a stable working environment for the bobbin core 2. The bobbin core 2 is rotatably arranged in the containing cavity, and through the cooperation of the inner casing 12 and the outer casing 13 of the bobbin case 1, the bobbin core 2 can rotate accurately and stably in the sewing machine. This structural design ensures the smooth operation of the bobbin core 2 during sewing, avoiding inaccurate detection caused by mechanical vibration or displacement. The inner casing 12 is provided with an observation hole 11, and the avoiding cutout 131 of the outer casing 13 provides a direct line-of-sight channel for the detection device 4 to aim at the bobbin core 2. The design of the observation hole 11 and the avoiding cutout 131 ensures that the detection device 4 can accurately aim at the strip-shaped hole 211 on the first panel 21 of the bobbin core 2 through them. This coordinated layout enables the detection device 4 to directly and stably detect the reflection signal of the bobbin core 2 inside the complex mechanical structure, without being blocked or interfered by other structures of the bobbin case 1. The strip-shaped hole 211 on the first panel 21 of the bobbin core 2 provides a moving space for the claw-shaped part 31 of the elastic member 3. As the consumption of the bottom thread inside the bobbin core 2, the moving range of the claw-shaped part 31 in the strip-shaped hole 211 changes, which in turn affects the intensity of the reflection signal. This design uses the change of the weight of the bottom thread to adjust the position of the claw-shaped part 31, thereby changing the characteristics of the reflection signal, providing a distinguishable signal related to the thread amount state of the bobbin core 2, solving the detection problem caused by the reflective material of the bobbin core 2. The detection end of the detection device 4 is arranged towards the first panel 21 of the bobbin case 1 to emit a detection signal and interact with the reflecting part 5 on the surface of the bobbin core 2 or the elastic member 3 through the observation hole 11, the avoiding cutout 131 and the strip-shaped hole 211. When the detection signal encounters surfaces with different reflection coefficients, the difference in the reflection signal intensity is captured by the detection device 4 and converted into information of the bottom thread state. This signal feedback mechanism, combined with the dynamic changes of the bobbin core 2 and the elastic member 3, provides accurate detection of the remaining amount of the bottom thread for the sewing machine.

[0035] Specifically, as Figure 5As shown, the bobbin shaft 23 includes coaxially arranged first and second bobbin shafts 231 and 232, the first bobbin shaft 231 is arranged on the side of the second bobbin shaft 232 close to the second panel 22, the diameter of the first bobbin shaft 231 is smaller than that of the second bobbin shaft 232, and at least part of the elastic member 3 is sleeved on the first and second bobbin shafts 231 and 232, respectively. By designing the bobbin shaft to be a stepped structure, i.e., the first and second bobbin shafts 231 and 232, and the diameter of the first bobbin shaft 231 is smaller than that of the second bobbin shaft 232, such a design ensures that the bottom thread can be distributed in layers when being wound. During the sewing process, the bottom thread is first consumed from the second bobbin shaft 232 with a larger diameter, and when the thread on the second bobbin shaft 232 is almost used up, the range of movement of the elastic member 3 becomes larger, which allows the claw-shaped part 31 on the elastic member 3 to further stretch, thereby tightening the remaining thread on the first bobbin shaft 231, so as to always maintain a certain amount of bottom thread, avoiding the stoppage of the sewing process due to the sudden depletion of the bottom thread. The stepped bobbin shaft design provides a more precise range of movement for the elastic member 3, and when the bottom thread on the second bobbin shaft 232 is depleted, the movement of the elastic member 3 will change significantly, the position of the claw-shaped part 31 in the strip-shaped hole changes accordingly, and the reflective member 5 also moves correspondingly, resulting in a significant change in the intensity of the reflected signal. This design enables the reflective laser sensor to more clearly identify the signal of the depletion of the bottom thread, improving the accuracy and stability of the bottom thread detection, thereby avoiding the problems of frequent replacement of the bottom thread or failure to replace the depleted bottom thread in time due to inaccurate detection. The coaxial arrangement of the first and second bobbin shafts 231 and 232 and the sleeving manner of the elastic member 3 ensure the stable rotation of the bobbin 2 in the sewing machine. This stability is crucial for the stitch quality during sewing and the operating efficiency of the sewing machine, especially at high sewing speeds, effectively reducing the phenomenon of thread breakage or skipping caused by mechanical vibration or displacement of the bobbin shaft, thereby ensuring the continuity of the sewing operation and the quality of the sewing.

[0036] In the above embodiment, the introduction of the stepped shaft, combined with the automatic adjustment function of the elastic member 3, makes the operation of the sewing machine more convenient. When the amount of thread on the bobbin shaft decreases to a certain extent, through monitoring of the reflected signal and signal processing of the control module, the sewing machine can automatically remind the operator to replace the bottom thread, without the need for frequent manual inspection of the bobbin state. This intelligent design not only improves production efficiency, but also reduces the labor intensity of the operator, which is of great significance for improving the user experience of the sewing machine. The design of the stepped bobbin shaft not only provides precise thread reserve management, but also optimizes the use of internal space of the sewing machine. The different diameters of the first and second bobbin shafts 231 and 232 and the sleeving of the elastic member 3 on the bobbin shaft enable the bobbin 2 and its related components to be efficiently arranged in a limited space, reducing the floor area occupied by the equipment, which has a significant effect on improving the compactness and flexibility of the factory production line.

[0037] In particular, as shown in Figure 6 The elastic member 3 further comprises a ring portion 32, which is sleeved on the bobbin shaft 23, and one end of the claw portion 31 is connected to the ring portion 32, and the other end of the claw portion 31 extends into the strip-shaped hole 211. The ring portion 32 is sleeved on the bobbin shaft 23, and through the close cooperation with the bobbin shaft 23, the ring portion 32 ensures the position stability and circumferential fixation of the elastic member 3 on the bobbin 2. This design enables the elastic member 3 to rotate with the bobbin shaft 23, while ensuring that the radial position of the elastic member 3 relative to the bobbin shaft 23 is unchanged, providing a stable basis for the movement of the claw portion 31. One end of the claw portion 31 is connected to the ring portion 32, and the other end extends into the strip-shaped hole 211. When the amount of thread on the bobbin 2 changes, the claw portion 31 can produce corresponding elastic deformation under the constraint of the ring portion 32. When the bottom thread is sufficient, the claw portion 31 is compressed due to the weight of the thread, and the depth of the claw portion 31 extending into the strip-shaped hole 211 is small; as the bottom thread is gradually consumed, the claw portion 31 elastically recovers, and the depth of the claw portion 31 extending into the strip-shaped hole 211 increases. This linkage directly changes the intensity of the reflected signal received by the reflective laser sensor, thereby providing a clear signal change basis for the detection of the bottom thread reserve. The strip-shaped hole 211 on the first panel 21 of the bobbin 2 provides space for the deformation and positioning of the claw portion 31. The strip-shaped hole 211 extends in the radial direction of the bobbin 2, and the claw portion 31 extends into the hole and moves in the radial direction within the hole. This configuration enables the claw portion 31 to move smoothly and accurately feedback the change in the amount of thread inside the bobbin 2 during the rotation of the bobbin 2 and the consumption of the thread. The presence of the strip-shaped hole 211 provides a reference for the reflected signal of the laser sensor, and also provides an intuitive visual path for the deformation of the claw portion 31.

[0038] In particular, as shown in Figure 2As shown, the annular part 32 is sleeved on the first bobbin shaft 231, and the claw-shaped part 31 includes a first step part 311, which is arranged on the annular part 32 close to the second bobbin shaft 232 along the radial direction of the bobbin shaft 23 and at least partially protrudes from the second bobbin shaft 232; a second step part 312, which is arranged in the strip-shaped hole 211; and a bevel part 313, one end of which is connected with the second step part 312, and the other end of which is rotatably connected with the second step part 312 around a predetermined rotation axis perpendicular to the axis of the bobbin 2, so as to drive the second step part 312 to move along the radial direction of the bobbin shaft 23. The annular part 32 is designed to be sleeved on the first bobbin shaft 231, and the elastic piece 3 is stably fixed on the bobbin shaft 23 through the clamping with the first bobbin shaft 231. This feature of the annular part 32 provides a stable support point for other parts of the elastic piece 3, such as the claw-shaped part 31, so that the position of the elastic piece 3 can be kept stable during the rotation of the bobbin 2 and unnecessary displacement or rotation does not occur. The first step part 311 is arranged on the annular part 32 close to the second bobbin shaft 232 and at least partially protrudes from the second bobbin shaft 232. This design enables the first step part 311 to elastically deform according to the change of the thread amount inside the bobbin 2, so as to drive other parts on the elastic piece 3 to move. When the thread amount on the bobbin 2 is sufficient, the cooperation of the first step part 311 and the annular part 32 makes the elastic piece 3 in a compressed state, the moving range of the claw-shaped part 31 is small, and the reflective piece 5 is in a deep position in the strip-shaped hole 211, so the reflection signal strength is low. The second step part 312 extends into the strip-shaped hole 211 on the first panel 21 of the bobbin 2, and as the thread amount inside the bobbin 2 is consumed, the second step part 312 moves along the radial direction of the strip-shaped hole 211 under the drive of the first step part 311, and its position in the strip-shaped hole 211 changes. This change is directly related to the strength of the reflection signal, and when the bottom thread is used up, the second step part 312 moves to the outermost side of the strip-shaped hole 211, the reflective piece 5 is brought to the best reflection position, and the reflection signal strength is significantly enhanced, so that it can be accurately captured by the detection device 4 and the replacement of the bottom thread is timely prompted. The bevel part 313 connects the first step part 311 and the second step part 312 and is rotatably connected around a predetermined rotation axis perpendicular to the axis of the bobbin 2. This design utilizes the lever effect of the bevel part 313, so that the deformation of the elastic piece 3 can be effectively converted into the radial movement of the second step part 312 in the strip-shaped hole 211. When the weight of the bottom thread decreases, the first step part 311 pops out due to the decrease of the internal pressure, and the bevel part 313 moves accordingly, and drives the second step part 312 to move outward along the radial direction of the strip-shaped hole 211 through the lever effect, which further affects the reflection signal strength and provides a clear signal change for the detection device 4, so that the state of the bottom thread can be accurately judged.

[0039] In particular, as Figure 7As shown, the elastic member 3 comprises a plurality of claw-shaped portions 31 which are arranged at intervals along the circumference of the annular portion 32, and the first panel 21 is provided with a plurality of strip-shaped holes 211 which are arranged in one-to-one correspondence with the plurality of claw-shaped portions 31. The plurality of claw-shaped portions 31 of the elastic member 3 are arranged at intervals along the circumference of the annular portion 32, and this arrangement ensures that the circumferential support force of the elastic member 3 on the bobbin 2 is uniformly distributed, thereby avoiding the problem of rotational imbalance of the bobbin 2 which may be caused by uneven local support force. When the weight of the bottom thread inside the bobbin 2 changes, the plurality of claw-shaped portions 31 can synchronously deform elastically to provide multiple-point signal changes for the detection device, thereby improving the accuracy and reliability of the detection. The plurality of strip-shaped holes 211 provided on the first panel 21 correspond to the claw-shaped portions 31 in one-to-one correspondence, and each strip-shaped hole 211 provides a space for movement for each claw-shaped portion 31. This correspondence ensures that each claw-shaped portion 31 can smoothly move in the radial direction of the strip-shaped hole 211 when the thread amount inside the bobbin 2 changes, and is not disturbed by adjacent components. The design of the strip-shaped hole 211 also provides multiple detection points for the reflective laser sensor, and the change in the reflection signal strength caused by the deformation of the plurality of claw-shaped portions 31 at different positions provides more abundant signal data, thereby enhancing the ability of the detection device to judge the state of the bottom thread.

[0040] Specifically, the annular portion 32 further comprises a first clamping portion 321 and a second clamping portion 322, which are respectively arranged at the two ends of the annular portion 32 along the axial direction of the bobbin 2, and the first panel 21 is provided with a clamping hole 212, at least part of the first clamping portion 321 extends into the clamping hole 212 to be clamped and matched with the first panel 21, and the second bobbin shaft 232 is provided with a groove 233 extending along the axial direction of the bobbin 2, and the second clamping portion 322 extends into the groove 233 to be clamped and matched with the bobbin shaft 23. At least part of the first clamping portion 321 extends into the clamping hole 212, which not only ensures the position of the annular portion 32 on the first panel 21, but also limits the movement range of the first clamping portion 321 through the shape and size of the clamping hole 212. The clamping hole 212 provides axial and circumferential limiting for the first clamping portion 321, so that the elastic member 3 can deform elastically according to the preset path and range when bearing the change of the weight of the bottom thread, thereby driving the accurate movement of the claw-shaped portion 31 in the strip-shaped hole 211. The second clamping portion 322 extends into the groove 233 of the second bobbin shaft 232, which further enhances the radial stability of the annular portion 32 on the bobbin shaft 23. The groove 233, as a matching structure of the second clamping portion 322, can provide sufficient radial limiting when the bobbin 2 rotates, thereby avoiding the radial displacement of the elastic member 3 during rotation, and ensuring the overall rigidity and position accuracy of the elastic member 3. This design is crucial for maintaining the stability of the elastic member 3 on the bobbin 2 and ensuring the accuracy of the detection of the thread reserve.

[0041] Specifically, the sewing machine further comprises a control module, the detection device 4 is a reflective laser sensor, the laser emitted by the reflective laser sensor is arranged corresponding to the strip-shaped hole 211, so that the reflective laser sensor collects the reflected laser of the claw-shaped part 31 or the second panel 22 and generates a reflected signal, and the control module is signal connected with the reflective laser sensor, so as to judge the state of the bottom thread through the reflected signal.

[0042] Through the signal connection between the control module and the reflective laser sensor, the sewing machine realizes the automatic detection of the state of the bottom thread. The laser sensor emits laser and receives reflected signals. When the laser irradiates different reflecting surfaces such as the claw-shaped part 31 or the second panel 22, the intensity of the reflected signal will change with the change of the amount of the bottom thread in the bobbin 2. This change is captured by the sensor and converted into an electrical signal, which is then transmitted to the control module for processing, realizing real-time monitoring and intelligent analysis of the state of the bottom thread, and improving the automation level of the sewing machine.

[0043] The reflective laser sensor realizes non-contact detection through the emission and reception of laser, avoiding the mechanical wear, pollution and detection error that may be caused by traditional contact detection methods. This non-contact detection method not only improves the accuracy and reliability of detection, but also prolongs the service life of the detection device and reduces the maintenance cost.

[0044] The laser emitted by the laser sensor can accurately aim at the strip-shaped hole 211, and even in the environment of high-speed operation of the sewing machine, the stable acquisition of the signal can be ensured. The change of the reflected signal intensity of the claw-shaped part 31 or the second panel 22 under different thread amount states provides clear and distinguishable signal basis for the control module, so that the judgment of the state of the bottom thread is more accurate and stable, reduces the production line downtime and sewing defects caused by inaccurate detection, and improves the production efficiency.

[0045] The control module analyzes the reflected signal in real time and can accurately judge whether the bottom thread inside the bobbin 2 needs to be replaced. When the sensor detects that the reflected signal reaches a pre-set threshold value, the control module will immediately issue a warning signal to remind the operator or automatically start the replacement process, avoiding the interruption of sewing caused by the depletion of the bottom thread, ensuring the continuity of the sewing process, and also improving the safety and convenience of operation.

[0046] The non-contact detection and high-precision characteristics of the reflective laser sensor enable it to work stably in complex industrial environments such as oil stains and dust, and it is not easily affected by external interference, ensuring the continuity and accuracy of the detection of the bottom thread. This stability is of great significance to improve product quality, reduce the rate of defective products and improve the overall performance of the production line.

[0047] By integrating the signal acquisition function of the reflective laser sensor with the control module of the sewing machine, not only the device structure is simplified, the occupied space of external controls is reduced, but also the data processing flow is optimized, making the bottom line detection system more compact and efficient. This integrated design also facilitates system upgrades and maintenance, providing technical support for the long-term stable operation of the sewing machine.

[0048] The present application has the following beneficial effects:

[0049] Improve detection accuracy and stability: The utility model discloses a strip hole 211 is arranged on the first panel 21 of the bobbin 2, and the claw-shaped part 31 of the elastic piece 3 is inserted into the strip hole 211, which realizes the precise detection of the internal thread amount change of the bobbin 2. When the thread amount on the bobbin 2 decreases, the claw-shaped part 31 of the elastic piece 3 will move to different positions of the strip hole 211 due to elastic recovery, which causes the intensity of the reflected signal to change. The detection device 4 can accurately judge the thread amount state of the bobbin 2 according to the change of the reflected signal intensity, avoiding the inaccurate detection problem caused by the reflective light of the bobbin material in the prior art, and improving the precision and stability of the bottom line detection.

[0050] Automatic warning mechanism: The signal processing mechanism of the detection device 4 is reasonably designed, when the signal intensity received by the laser sensor exceeds the preset threshold, it indicates that the claw-shaped part 31 has moved to a specific position of the strip hole 211, which means that the bottom line on the bobbin 2 is about to run out. After receiving this signal, the control terminal can timely send a warning to the operator to replace the bottom line, avoiding the interruption of sewing caused by the depletion of the bottom line, and improving the automation level and production efficiency of the sewing machine.

[0051] Ensure the continuity of sewing and product quality: Through the cooperative design of the bobbin 2 and the elastic piece 3, the utility model can automatically alarm when the bottom line reaches the preset minimum amount, ensuring that the operator replaces the bottom line in time before it is depleted, avoiding the decline of sewing quality and production stop caused by thread breakage or depletion during the sewing process. This continuity and product quality guarantee is of great significance to improve production efficiency and reduce production cost.

[0052] Optimize structure and space utilization: The structure layout design of the bobbin 2 and the elastic piece 3 is compact and reasonable, the first panel 21 and the second panel 22 of the bobbin 2 are respectively arranged at both ends of the bobbin shaft 23, and the elastic piece 3 and the claw-shaped part 31 are ingeniously embedded in the bobbin shaft 23 and the strip hole 211. This design not only reduces the occupied space of the device, but also ensures the stable rotation of the bobbin 2 inside the sewing machine, avoiding additional mechanical vibration and displacement, optimizing the internal structure and space utilization of the sewing machine.

[0053] Enhance user operation experience: the utility model discloses through automatic detection and early warning, reduce the manual monitoring of the operation personnel to the bottom line state, improve the convenience of operation and the intelligent degree of machine. The operator no longer needs to check the thread amount of the bobbin 2 frequently, reduces the working strength, and improves the use efficiency and operation experience of the sewing machine.

[0054] Long-acting durability and simple maintenance: the stable connection of the claw-shaped part 31 of the elastic member 3 and the bobbin shaft 23, and the improvement of the internal structure of the bobbin 2 ensure the long-acting durability of the detection component. At the same time, the arrangement mode of the detection device 4 and the first panel 21 of the bobbin case 1 can stably operate in the complex space inside the sewing machine, reduces the maintenance demand caused by environmental factors such as oil stains, wool, etc., makes the whole detection device maintenance simple, reduces the maintenance cost and time of the equipment.

[0055] In summary, by applying the technical scheme of the utility model, through the synergistic effect between the bobbin 2, the elastic member 3 and its claw-shaped part 31 and the detection device 4, not only the detection problem caused by the reflection characteristics of the bobbin material is solved, but also the automatic early warning of the bobbin thread replacement of the sewing machine is realized, the continuity of the sewing machine work and the high quality of the sewing product are ensured, the structure layout and user operation experience of the equipment are optimized, and an advanced, reliable and efficient bobbin thread detection technical scheme is provided for the sewing industry. The application of this technology can significantly improve the production efficiency and automation level of the sewing machine, reduce the labor intensity of the operator, and provide strong support for the intelligent production of modern textile and garment manufacturing industry.

[0056] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit example embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sewing machine comprising a machine body, characterized in that, The sewing machine comprises: a bobbin (2) arranged on the machine body and rotatable about its axis; the bobbin (2) comprises a first panel (21), a second panel (22) and a bobbin shaft (23), the first panel (21) and the second panel (22) are arranged at two ends of the bobbin shaft (23) respectively, and the first panel (21) is provided with a strip-shaped hole (211) extending in the radial direction of the bobbin (2); the first panel (21) is arranged at one end of the bobbin (2) close to the machine body; a resilient member (3) sleeved on the bobbin shaft (23), the resilient member (3) has a claw-shaped part (31) movably arranged, at least part of the claw-shaped part (31) extends into the strip-shaped hole (211), and the claw-shaped part (31) is movably arranged in the radial direction of the bobbin (2) in the strip-shaped hole (211) for winding a bottom thread on the bobbin (2); a detection device (4) having a detection end arranged towards the first panel (21) for emitting a detection signal towards the strip-shaped hole (211), so as to determine whether the bottom thread needs to be replaced when a monitoring signal emitted back by the claw-shaped part (31) is received, and to determine that the bottom thread does not need to be replaced when a signal reflected back by the first panel (21) or the second panel (22) is received.

2. The sewing machine according to claim 1, characterized in that, The detection device further comprises: a light-reflecting member (5) arranged in the strip-shaped hole (211) and connected with the claw-shaped part (31) so that the claw-shaped part (31) drives the light-reflecting member (5) to move.

3. The sewing machine of claim 2, wherein, The light-reflecting member (5) is a circular light-reflecting sticker, the light-reflecting sticker is arranged at the end of the claw-shaped part (31), and the axis of the light-reflecting sticker is parallel to the axis of the bobbin (2).

4. The sewing machine of claim 1, wherein, The sewing machine further comprises: a bobbin case (1) arranged on the machine body, the bobbin case (1) has an inner casing (12) for forming a containing cavity and an outer casing (13) covering the outer side of the inner casing (12), and the bobbin (2) is rotatably arranged in the containing cavity; wherein the inner casing (12) is provided with an observation hole (11), the outer casing (13) is provided with a relief cut (131), the observation hole (11) is arranged correspondingly with the strip-shaped hole (211), and the state of the bottom thread is determined by the signal reflected back by the claw-shaped part (31), the first panel (21) or the second panel (22) when the relief cut (131), the observation hole (11) and the strip-shaped hole (211) are arranged in a relative position.

5. The sewing machine of claim 1, wherein, The shuttle shaft (23) comprises coaxially arranged first and second shuttle shafts (231, 232), the first shuttle shaft (231) is arranged on the side of the second shuttle shaft (232) close to the second panel (22), the diameter of the first shuttle shaft (231) is smaller than that of the second shuttle shaft (232), and at least part of the elastic member (3) is sleeved on the first and second shuttle shafts (231, 232) respectively.

6. The sewing machine of claim 5, wherein, The elastic member (3) further comprises a ring-shaped portion (32) sleeved on the shuttle shaft (23), one end of the claw-shaped portion (31) is connected to the ring-shaped portion (32), and the other end of the claw-shaped portion (31) extends into the strip-shaped hole (211).

7. The sewing machine of claim 6, wherein, The ring-shaped portion (32) is sleeved on the first shuttle shaft (231), and the claw-shaped portion (31) comprises: a first stepped portion (311) arranged on the end of the ring-shaped portion (32) close to the second shuttle shaft (232) along the radial direction of the shuttle shaft (23) and at least partially extending out of the second shuttle shaft (232); a second stepped portion (312) arranged in the strip-shaped hole (211); and a beveled portion (313) having one end connected to the second stepped portion (312) and the other end rotatably connected to the second stepped portion (312) about a predetermined rotation axis, so as to drive the second stepped portion (312) to move radially along the shuttle shaft (23), and the predetermined rotation axis is perpendicular to the axis of the shuttle (2).

8. The sewing machine of claim 6, wherein, The elastic member (3) comprises a plurality of claw-shaped portions (31) arranged at intervals along the circumferential direction of the ring-shaped portion (32), and the first panel (21) is provided with a plurality of strip-shaped holes (211) arranged one-to-one with the plurality of claw-shaped portions (31).

9. The sewing machine of claim 7, wherein, The ring-shaped portion (32) further comprises first and second clamping portions (321, 322) arranged at the two ends of the ring-shaped portion (32) along the axial direction of the shuttle (2), the first panel (21) is provided with a clamping hole (212), at least part of the first clamping portion (321) extends into the clamping hole (212) to be clamped and matched with the first panel (21), and the second shuttle shaft (232) is provided with a groove (233) extending along the axial direction of the shuttle (2), and the second clamping portion (322) extends into the groove (233) to be clamped and matched with the shuttle shaft (23).

10. The sewing machine of claim 1, wherein, The sewing machine further comprises a control module, the detection device (4) is a reflective laser sensor, the laser emitted by the reflective laser sensor corresponds to the strip-shaped hole (211) and is arranged so that the reflective laser sensor collects the laser reflected by the claw-shaped part (31) or the second panel (22) and generates a reflected signal, and the control module is in signal connection with the reflective laser sensor, so as to judge the state of the bottom thread through the reflected signal.

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