Retracting and releasing mechanism of taping embroidery scissors and thread trimming device

Abstract

The utility model discloses a take-up and pay-off mechanism and trimming device of taping embroidery scissors, the take-up and pay-off mechanism comprises a take-up and pay-off driving assembly and a take-up and pay-off connecting rod assembly, the take-up and pay-off driving assembly comprises a first linear driver and a guide structure, the first linear driver comprises a first linear driving part and a first linear reciprocating moving part, and the guide structure comprises a second linear driving part and a second linear reciprocating moving part. The first linear driving part drives the first linear reciprocating moving part to linearly reciprocate back and forth; the connecting rod folding and unfolding assembly comprises a swing connecting rod, and the swing connecting rod is connected with the scissor assembly, the first linear reciprocating motion component and the guide structure. The first linear reciprocating motion component drives the swing connecting rod to move and swing along the guide structure so as to change the height and the front-back position of the shear assembly, so that the shear assembly is switched between a thread trimming state and a return state, the efficiency of the switching process is improved, the number of components is reduced, and the cost is reduced.

Description

[Technical field]

[0001] The utility model belongs to the technical field of embroidery machines, and in particular relates to a coiling embroidery machine. [Background technology]

[0002] With reference to the Chinese utility model patent with the authorization announcement number CN216237648U, a thread trimming mechanism of a tape embroidery machine is disclosed, the tape embroidery machine comprises a tape needle bar and a tape presser foot, the tape needle bar is sequentially sleeved with a needle bar sleeve and a tape driving pulley, the tape presser foot is fixedly connected to the needle bar sleeve, the thread trimming mechanism comprises a moving knife fixedly connected to the tape driving pulley and a thread trimming blade provided on the tape presser foot, the thread trimming blade is adapted to the moving knife, and when the tape presser foot is raised, the thread trimming blade is tangent to the moving knife to trim the thread. By lifting the needle bar sleeve and the tape presser foot, the thread trimming blade on the tape presser foot is adapted to the moving knife fixedly connected to the tape driving pulley, and the silk thread wound in the thread trimming blade can be trimmed. However, since the thread cutting blade is installed on the winding presser foot, the thread cutting blade on the winding presser foot and the moving knife fixed on the winding active pulley are adapted to cut the thread, and the thread cutting blade is located on the winding presser foot, the thread cutting position is too low, resulting in too short thread ends, and the rope / belt sewn on the cloth surface is easy to fall off. Of course, other winding embroidery thread cutting devices in the prior art are also set too high from the cloth surface, which also has the disadvantage of leaving long thread ends.

[0003] In order to solve the problem of the thread end being too long or too short after thread trimming, the prior art also provides a retractable mechanism. However, during the conversion between the thread trimming state and the return state, the retractable mechanism needs to drive the scissors assembly to move forward and backward, and also needs to realize the lifting movement. Usually, it is necessary to set up front and rear drive components and lifting drive components, and the two usually move in sequence, resulting in low efficiency of the conversion process, complex structure, more components, and high cost. [Utility Model Content]

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a retractable mechanism and a thread trimming device for a pair of tape embroidery scissors, so as to improve the efficiency of the scissors assembly in switching between a thread trimming state and a return state.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] First, a retractable mechanism of a tape embroidery scissors is provided, which is used to drive the scissors assembly to switch between a thread cutting state and a return state, the retractable mechanism includes a retractable drive assembly and a retractable connecting rod assembly, the retractable drive assembly includes a first linear drive and a guide structure, the first linear drive includes a first linear drive component and a first linear reciprocating moving component, the first linear drive component drives the first linear reciprocating moving component to move back and forth linearly; the retractable connecting rod assembly includes a swing connecting rod, the swing connecting rod is connected to the scissors assembly, the first linear reciprocating moving component and the guide structure, the first linear reciprocating moving component drives the swing connecting rod to move and swing along the guide structure to change the height and front and rear position of the scissors assembly, thereby enabling the scissors assembly to switch between a thread cutting state and a return state.

[0007] Preferably, the retractable link assembly includes a first swing link and a second swing link, the head end of the first swing link is hinged to the scissors assembly, and the tail end is connected to the first linear reciprocating moving component, and the head end of the second swing link is hinged to the scissors assembly, and the tail end is connected to the first linear reciprocating moving component.

[0008] Preferably, the retractable link assembly also includes a first roller link connected to a first roller, the end of the first roller link away from the first roller is connected to the first swing link, the guide structure includes a guide plate and a guide groove provided on the guide plate, and the first roller is connected to the guide groove.

[0009] Preferably, the guide groove includes two horizontal sections with a height difference and an oblique section connecting the two horizontal sections. In the trimming state, the first roller is connected to the front horizontal section, and in the return state, the first roller is connected to the rear horizontal section.

[0010] Preferably, the head ends of the first swing link and the second swing link are hinged to a first link bracket, and the first link bracket is connected to the scissors assembly.

[0011] Preferably, the tail ends of the first swing link and the second swing link are hinged to the second link bracket, and the second link bracket is connected to the first linear reciprocating moving component.

[0012] Preferably, the first linear driving component includes a screw motor, a screw, and a nut. The screw motor drives the screw to rotate, and the nut is threadedly connected to the screw. The first linear reciprocating moving component includes a linear slider and a linear guide rail. The linear slider is slidably matched with the linear guide rail, and the nut is connected to the linear slider.

[0013] Preferably, a limit stopper is installed at the end of the linear guide rail.

[0014] Preferably, the nut is connected to a nut seat, the nut seat is connected to a sensor plate, and a position sensor for sensing the position of the sensor plate is provided near the position of the lead screw motor.

[0015] In addition, the utility model also provides a coiling embroidery thread cutting device, including the retracting and releasing mechanism.

[0016] The utility model adopts the above technical solution, and the retracting mechanism drives the scissors assembly to switch between the thread cutting state and the return state. Through the control of the retracting mechanism, the scissors assembly can be placed at a more appropriate height, so that the thread can be cut close to the cloth surface and the problem of the thread end being too long or too short after cutting can be solved.

[0017] Since only the first linear drive, which is one driving source, is provided, and in order to realize that one driving source drives the scissors assembly to simultaneously complete the forward and backward movement and the lifting and lowering movement, a matching structure of a swing link and a guide structure is adopted. In this way, the first linear reciprocating moving component drives the swing link to move and swing along the guide structure to change the height and the forward and backward position of the scissors assembly, thereby enabling the scissors assembly to switch between the wire cutting state and the return state. This not only improves the efficiency of the conversion process, but also reduces the components. Taking the use of a linear motor as a driving source as an example, one set of linear motors can be reduced, thereby significantly reducing the cost.

[0018] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is a lateral side view of the tape embroidery machine in the thread trimming state;

[0021] Figure 2 It is a structural schematic diagram of the thread cutting device for coiling embroidery in the thread cutting state;

[0022] Figure 3 It is a structural schematic diagram of the thread cutting device for tape embroidery in the return state;

[0023] Figure 4 It is a partial structural schematic diagram of the thread cutting device for tape embroidery;

[0024] Figure 5 It is a structural schematic diagram of the retractable connecting rod assembly and the guide structure;

[0025] Figure 6 It is a structural schematic diagram of the retractable connecting rod assembly;

[0026] Figure 7 is a schematic diagram of the structure of the scissors assembly;

[0027] Figure numerals: scissors assembly 1, scissors bracket 11, blade 12, U-shaped groove 121, limiting sleeve 122, support shaft 13, limiting nut 131, compression spring 14, cylinder 15, push rod 151, scissors opening and closing block 16, protrusion 161, second roller 17, retracting mechanism 2, retracting connecting rod assembly 21, first swing connecting rod 211, second swing connecting rod 212, first connecting rod bracket 213, second connecting rod bracket 214, hinged ear 2141, first roller connecting rod 215, first roller 216, roller mounting seat 217, retracting drive assembly 22, screw motor 221, screw 222 , nut 223, nut seat 224, side ear 2241, sensor plate 2242, linear guide rail 225, limit baffle 2251, linear slider 226, guide structure 23, guide plate 231, rear section 2311, transition section 2312, front section 2313, guide slot 232, rear horizontal section 2321, oblique section 2322, front horizontal section 2323, bracket assembly 24, fixing block 241, fixing head 2411, casing pad 2412, rear fixing plate 242, position sensor 2421, support column 243, bottom bracket 244, machine head 3, cross beam 4. [Specific implementation method]

[0028] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0029] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0030] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words indicating orientation or positional relationship, such as "upper", "lower", "front", "rear", "lateral", etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0034] like Figures 1 to 7 As shown, the thread cutting device for tape embroidery includes a scissor assembly 1 and a retracting mechanism 2. The scissor assembly 1 has a thread cutting state located below the tape embroidery machine head 3 and a return state returned to the rear side of the tape embroidery machine head. In addition, the height of the scissor assembly 1 in the thread cutting state is lower than the height of the scissor assembly in the return state. The retracting mechanism 2 is used to drive the scissor assembly 1 to switch between the thread cutting state and the return state, that is, when the scissor assembly 1 switches between the thread cutting state and the return state, not only the front and rear positions change, but also the height changes.

[0035] In the above technical solution, the retracting and releasing mechanism drives the scissor assembly to switch between the thread cutting state and the return state. In the thread cutting state, the scissor assembly is located below the tape embroidery machine head and can perform the thread cutting action. Through the control of the retracting and releasing mechanism, the scissor assembly can be placed at a more appropriate height, so that the thread can be cut close to the cloth surface and the problem of the thread end being too long or too short after thread cutting can be solved.

[0036] In addition, under the control of the retracting and releasing mechanism, after the scissors assembly retreats to the rear side of the tape embroidery machine head in the return state, the tape embroidery machine head can perform tape embroidery normally, and the scissors assembly will not affect it.

[0037] As one embodiment, the retractable mechanism 2 includes a retractable drive assembly 22 and a retractable connecting rod assembly 21. The retractable drive assembly 22 includes a first linear drive and a guide structure 23, wherein the first linear drive includes a first linear drive component and a first linear reciprocating moving component, wherein the first linear drive component drives the first linear reciprocating moving component to move back and forth linearly; the retractable connecting rod assembly 21 includes a swing connecting rod, wherein the swing connecting rod is connected to the scissor assembly 1, the first linear reciprocating moving component and the guide structure 23, wherein the swing connecting rod is hinged to the first linear reciprocating moving component, and thus can swing, wherein the first linear reciprocating moving component drives the swing connecting rod to move and swing along the guide structure 23, so as to change the height and front and rear position of the scissor assembly 1, thereby switching the scissor assembly 1 between the line cutting state and the return state. The guide structure 23 here extends forward and backward, not only guiding the swing connecting rod to move forward and backward, but also allowing the swing connecting rod to swing relative to the first linear reciprocating moving component.

[0038] Since the retracting and releasing mechanism needs to drive the scissors assembly to move forward and backward and also needs to realize lifting motion during the conversion process between the trimming state and the return state, it is usually necessary to set a front and rear driving component and a lifting driving component, two driving sources, to realize the two directions of motion, and the two usually move in sequence, resulting in low efficiency of the conversion process, complex structure, more components, and high cost. In view of this, in the present embodiment, only a first linear driver, which is a driving source, is provided, and in order to realize that one driving source drives the scissors assembly to complete the forward and backward movement and lifting motion at the same time, a matching structure of a swing link and a guide structure is adopted, so that the first linear reciprocating moving component drives the swing link to move and swing along the guide structure to change the height and the front and rear position of the scissors assembly, so that the scissors assembly can be converted between the trimming state and the return state, which not only improves the efficiency of the conversion process, but also reduces the components. Taking the linear motor as the driving source as an example, a set of linear motors can be reduced, which significantly reduces the cost.

[0039] Furthermore, the retractable link assembly 21 includes a first swing link 211 and a second swing link 212, wherein the head end of the first swing link 211 is hinged to the scissors assembly 1 and the tail end is connected to the first linear reciprocating moving component, and the head end of the second swing link 212 is hinged to the scissors assembly 1 and the tail end is connected to the first linear reciprocating moving component. The head ends of the first swing link 211 and the second swing link 212 are hinged to the first link bracket 213, and the first link bracket 213 is connected to the scissors assembly 1. The tail ends of the first swing link 211 and the second swing link 212 are hinged to the second link bracket 214, and the second link bracket 214 is connected to the first linear reciprocating moving component.

[0040] The above technical solution connects the retractable link assembly 21 to the scissors assembly 1 through the first link bracket 213, and connects the retractable link assembly 21 to the first linear reciprocating component through the second link bracket 214. In this way, the entire retractable link assembly is connected to the scissors assembly and the first linear reciprocating component as a whole, so it is convenient to quickly assemble and install. The first swing link 211 and the second swing link 212 are set at the same time to ensure that the scissors assembly 1 maintains its posture during the conversion between the trimming state and the return state, especially to ensure the posture in the trimming state, that is, the scissors assembly is in a horizontal state as a whole and is maintained at a set height, which is conducive to ensuring the trimming quality in the trimming state. Among them, the first link bracket 213 is a long rectangular structure, the rectangular surface is perpendicular to the horizontal plane, and can be fixed to the scissors assembly 1 by screws. The head end of the first swing link 211 is hinged to the rear side of the length of the first side rectangular surface of the first link support 213, and the head end of the second swing link 212 is hinged to the front side of the length of the first side rectangular surface of the first link support 213, and is connected to the side of the scissor support 11 in the scissor assembly with the second side rectangular surface of the first link support 213. The second link support 214 is a long rectangular structure, but the rectangular surface is parallel to the horizontal plane and perpendicular to the first link support 213, and can be fixed to the first linear reciprocating moving component by screws. The tail end of the first swing link 211 is hinged to the middle part of the first side surface of the width of the second link support 214, and the tail end of the second swing link 212 is hinged to the hinge ear 2141 protruding upward on one side of the length of the first side surface of the width of the second link support 214, which also facilitates the connection of one of the rectangular surfaces of the second link support 214 with the linear slider 226. The above-mentioned hinged parts can all be connected by connecting rod pins, and the connecting rod pins can also be supported by bearings.

[0041] As one embodiment, the first linear driving component includes a screw motor 221, a screw 222, and a nut 223. The screw motor 221 drives the screw 222 to rotate. The nut 223 is threadedly connected to the screw 222. The first linear reciprocating moving component includes a linear slider 226 and a linear guide 225. The linear slider 226 is slidably matched with the linear guide 225. The nut 223 is connected to the linear slider 226. The second connecting rod bracket 214 is fixedly connected to the top of the linear slider 226. The nut 223 is connected to a nut seat 224. The nut seat 224 is provided with a side ear 2241. The side ear 2241 is fixed to the second side surface of the width of the second connecting rod bracket 214 and can be fixed by screws. In addition, a limit stopper 2251 is installed at the end of the linear guide 225. The nut seat 224 is connected to a sensing sheet 2242, and a position sensor 2421 is provided near the screw motor 221 to sense the position of the sensing sheet 2242, thereby sensing the position of the nut seat 224. In this way, when the scissors assembly 1 reaches the corresponding position of the thread trimming state and the return state, the screw motor 221 is controlled to stop running. Of course, the first linear drive component mentioned above can also be replaced by a pneumatic linear drive structure.

[0042] Furthermore, the retractable link assembly 21 also includes a first roller link 215 connected to a first roller 216, and one end of the first roller link away from the first roller is connected to the first swing link. Specifically, the first roller link 215 is arranged on the tail side of the first swing link and fixed side by side, and the other end is connected to the first roller 216, and the first roller is installed on the first roller link 215 through a roller mounting seat 217.

[0043] like Figure 5 As shown, the guide structure 23 includes a guide plate 231 and a guide slot 232 provided on the guide plate, and the first roller 216 is connected to the guide slot 232. Specifically, the guide slot 232 includes two horizontal sections with a height difference and an oblique section 2322 connecting the two horizontal sections, namely, a front horizontal section 2323 and a rear horizontal section 2321, and the first roller is lifted and lowered and moved forward and backward by the oblique section. Correspondingly, the guide plate 231 has a front section 2313, a rear section 2311 and a transition section 2312 along the length direction, and the front section 2313 and the rear section 2311 are both rectangular structures, corresponding to the front horizontal section 2323 and the rear horizontal section 2321, and the width of the front section 2313 is smaller than that of the rear section 2311, and the transition section 2312 is a right-angled trapezoidal structure, and its oblique waist corresponds to the oblique section 2322.

[0044] Since the first roller 216 is in rolling connection with the guide slot 232, it is possible to ensure that the first roller 216 moves along the guide slot 232, and the retractable link assembly 21 can swing relative to the first roller 216 as a fulcrum. The design of the oblique section 2322 in the guide slot is mainly to achieve the lifting and lowering and forward and backward movement of the first roller, so that the retractable link assembly 21 can be lifted and lowered as a whole. Figure 1 and Figure 2 As shown, in the trimming state, the first roller 216 is connected to the front horizontal section 2323, the tail ends of the first swing link 211 and the second swing link 212 are at the rear and higher, and the head ends are at the front and lower, forming an inclined shape, and the first link bracket 213 is lower than the rear horizontal section 2321, roughly corresponding to the front and rear position of the front horizontal section 2323 or slightly more forward. Figure 3 As shown, the first roller 216 is connected to the rear horizontal section 2321, the first swing link 211 and the second swing link 212 are horizontal or approximately horizontal, and the first link bracket 213 and the scissor assembly 1 are roughly corresponding in height and front-to-back position to the front horizontal section 2323. In this way, it is also helpful to keep the scissor assembly 1 in the trimming state and the return state, especially to ensure that the trimming assembly is in a horizontal posture in the trimming state, so as to ensure the trimming quality in the trimming state.

[0045] As one of the implementation methods, Figure 7 As shown, the scissors assembly 1 includes a scissors support 11, two blades 12 cross-hinged to the scissors support through a support shaft 13, and a scissors driver for driving the two blades to open and close. The two blades open and close horizontally to cut the thread in the thread cutting state.

[0046] Here, the scissor assembly is composed of two cross-hinged blades, that is, a conventional scissor structure, so that the thread ends are relatively flat after cutting. In addition, in the cutting state, the scissor assembly is in a horizontal position, and the two blades are opened and closed horizontally to cut the thread, so that the thread can be cut at a height close to the cloth surface (of course, it is not like the solution in the background technology, which cuts the thread close to the cloth surface and causes the thread ends to be too short).

[0047] Specifically, the scissors driver includes a second linear driving component installed on the scissors bracket, a second linear reciprocating moving component driven by the second linear driving component to move linearly, and the second linear reciprocating moving component is hinged to the two blades. The second linear driving component is a cylinder 15, preferably a double push rod cylinder. The second linear reciprocating moving component is a scissors opening and closing block 16, the scissors opening and closing block 16 is connected to the push rod 151 of the cylinder, and the scissors opening and closing block 16 is hinged to the blade 12.

[0048] Furthermore, both ends of the scissors opening and closing block 16 are provided with protrusions 161 protruding forward, and the protrusions 161 are hinged with a second roller 17. The rear of the blade 12 is provided with a driving handle extending outward, and the driving handle is on the rear side of the support shaft. The driving handle is provided with a U-shaped groove 121, and the second roller 17 cooperates with the U-shaped groove 121.

[0049] In the above technical solution, the push rod 151 of the cylinder drives the scissors opening and closing block 16 to move linearly forward and backward, thereby driving the two blades 12 to open and close horizontally around the support shaft 13 to cut the thread in the thread cutting state, and the thread cutting and resetting can be completed quickly.

[0050] Of course, it is understood that the scissor drives can also be replaced by linear motors.

[0051] In addition, one of the blades 12 is connected to a compression spring 14, which is sleeved on the support shaft 13. A limiting sleeve 122 is provided around one end of the compression spring of the blade, and the other end of the compression spring is limited by a limiting nut 131 fixed to the end of the support shaft to ensure that the two blades 12 fit closely and improve the wire cutting quality.

[0052] It is understandable that the scissors assembly 1 can also be replaced by other common scissors structures, such as a scissors structure in which a movable knife and a fixed knife cooperate.

[0053] The above-mentioned coiling embroidery thread cutting device is installed on a coiling embroidery machine, wherein the coiling embroidery machine includes a crossbeam 4 and a machine head 3 installed on the crossbeam, which may be a plurality of machine heads 3 arranged at intervals along the crossbeam in the horizontal direction, and the machine head includes a connecting housing, and a coiling embroidery thread cutting device is arranged corresponding to each machine head. The coiling embroidery thread cutting device is also provided with a bracket assembly 24. Specifically, the bracket assembly 24 includes a fixed block 241 extending forward and backward, a fixed head 2411 raised upward is arranged at the front of the fixed block, a housing pad 2412 is fixed to a horizontal side of the housing, and the housing pad 2412 is fixed to a horizontal side of the housing, a rear fixing plate 242 is fixed to the rear end of the fixed block, a screw motor 221 is fixed to the rear side of the rear fixing plate, and a position sensor 2421 is installed on the sensor mounting plate, and the sensor mounting plate is fixed to the side of the rear fixing plate. In addition, a beam bottom bracket 244 is fixed to the rear side of the rear fixing plate, and the beam bottom bracket 244 is arranged below the crossbeam and fixed to the bottom surface of the crossbeam. The guide structure 23 is arranged on one lateral side of the fixed block 241, and a support column 243 is connected between the two, and a gap is formed between the two for the movement of the retractable connecting rod assembly 21. The rear ends of the fixed block 241 and the guide plate 231 are fixedly connected to the rear fixed plate 242, and the above-mentioned fixed connection method can be bolted. After the bracket assembly 24 is fixed to the crossbeam and the machine head, the installation of the coiling embroidery thread cutting device is completed. In addition, the above-mentioned coiling embroidery thread cutting device can be set at a more appropriate height by setting the installation height and combining the guidance of the guide structure 23.

[0054] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A retractable mechanism for a tape embroidery scissors, used to drive the scissors assembly to switch between a thread cutting state and a return state, characterized in that: The retractable mechanism includes a retractable drive assembly and a retractable connecting rod assembly, the retractable drive assembly includes a first linear drive and a guide structure, the first linear drive includes a first linear drive component and a first linear reciprocating moving component, the first linear drive component drives the first linear reciprocating moving component to move back and forth linearly; the retractable connecting rod assembly includes a swing connecting rod, the swing connecting rod is connected to the scissors assembly, the first linear reciprocating moving component and the guide structure, the first linear reciprocating moving component drives the swing connecting rod to move and swing along the guide structure to change the height and front and rear position of the scissors assembly, thereby switching the scissors assembly between the line cutting state and the return state.

2. The retractable mechanism of the tape embroidery scissors according to claim 1, characterized in that: The retractable link assembly includes a first swing link and a second swing link. The head end of the first swing link is hinged to the scissors assembly and the tail end is connected to the first linear reciprocating moving component. The head end of the second swing link is hinged to the scissors assembly and the tail end is connected to the first linear reciprocating moving component.

3. The retractable mechanism of the tape embroidery scissors according to claim 2, characterized in that: The retractable link assembly also includes a first roller link connected to a first roller, wherein one end of the first roller link away from the first roller is connected to a first swing link, and the guide structure includes a guide plate and a guide slot provided on the guide plate, and the first roller is connected to the guide slot.

4. The retractable mechanism of the tape embroidery scissors according to claim 3, characterized in that: The guide slot includes two horizontal sections with a height difference and an oblique section connecting the two horizontal sections. In the trimming state, the first roller is connected to the front horizontal section, and in the return state, the first roller is connected to the rear horizontal section.

5. The retractable mechanism of the tape embroidery scissors according to claim 3, characterized in that: The head ends of the first swing link and the second swing link are hinged to the first link bracket, and the first link bracket is connected to the scissors assembly.

6. The retractable mechanism of the tape embroidery scissors according to claim 2, characterized in that: The tail ends of the first swing link and the second swing link are hinged to the second link bracket, and the second link bracket is connected to the first linear reciprocating moving component.

7. The retractable mechanism of the tape embroidery scissors according to claim 1, characterized in that: The first linear driving component includes a screw motor, a screw, and a nut. The screw motor drives the screw to rotate, and the nut is threadedly connected to the screw. The first linear reciprocating moving component includes a linear slider and a linear guide rail. The linear slider is slidably matched with the linear guide rail, and the nut is connected to the linear slider.

8. The retractable mechanism of the tape embroidery scissors according to claim 7, characterized in that: A limit stopper is installed at the end of the linear guide rail.

9. The retractable mechanism of the tape embroidery scissors according to claim 7, characterized in that: The nut is connected to a nut seat, the nut seat is connected to a sensing sheet, and a position sensor for sensing the position of the sensing sheet is provided near the position of the lead screw motor.

10. A thread cutting device for tape embroidery, characterized in that: It comprises the retractable and extendable mechanism as described in any one of claims 1 to 9.

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