A color changing box for improving needle stopping accuracy and its control method

Abstract

This application discloses a color-changing box that improves needle stopping accuracy, belonging to the technical field of color-changing boxes for embroidery machines. The key technical solutions include: a box body equipped with a drive device; a cylindrical indexing cam mounted within the box body and connected to the drive device; two guide rods mounted within the box body, the axes of the guide rods being parallel to the axes of the cylindrical indexing cams; a slider mounted on the guide rods, the slider having a sliding portion corresponding to the cylindrical indexing cams; a locking mechanism positioned on either side of the slider for locking the slider; a buffer mechanism positioned between the sliding portion and the slider; and a push-pull member mounted and connected to the slider for controlling the movement of the needle position plate. This application ensures rapid and high-precision needle stopping in the color-changing box.

Description

Technical Field

[0001] The present application belongs to the technical field of color change boxes for embroidery machines, and in particular relates to a color change box for improving needle stopping accuracy and a control method thereof. Background Art

[0002] When embroidering, if the thread on a needle runs out and needs to be rethreaded, or a different color needs to be changed, the operation is troublesome. Therefore, needle position plates and color change boxes came into being. There are multiple needles on the needle position plate, and each needle is threaded with the same or different color threads. You only need to change different needles through the color change box to make the embroidery action continuous.

[0003] The existing Chinese patent with publication number CN110644157A discloses a needle position detection device and a color changing box. The needle position detection device is connected to a rotating part that drives the needle position plate; the needle position detection device includes a gear set and a sensing chip, and the gear set includes an open-end gear and a terminal gear that are meshed together. The center of the open-end gear is fixedly connected to the rotating part, and a sensing part is provided on the terminal gear. The sensing chip senses the changes of the sensing part to detect the number of rotations of the terminal gear.

[0004] Although the above-mentioned color changing box can realize needle position detection, the existing color changing box has a slow needle changing speed, and there is a gap between the cylindrical indexing cam and the slider. If the needle changing speed is to be increased, the needle stopping accuracy will be reduced. In order to ensure that the color changing box stops the needle quickly and accurately, improvements are made to this. Summary of the Invention

[0005] The purpose of this application is to address the above-mentioned technical problems and provide a color changing box and a control method thereof that improve the needle stopping accuracy, which can ensure the fast and high-precision performance of the color changing box needle stopping.

[0006] This application provides a color changing box with improved needle stopping accuracy, comprising:

[0007] a box body, wherein the box body is provided with a driving device;

[0008] A cylindrical indexing cam is installed in the box and connected to the driving device;

[0009] Two guide rods are provided and installed in the box body, and the axes of the guide rods are parallel to the axis of the cylindrical indexing cam;

[0010] A slider is mounted on the guide rod, wherein the slider is provided with a sliding portion corresponding to the cylindrical indexing cam;

[0011] The locking mechanisms are respectively placed on both sides of the slider, and are used to lock the slider;

[0012] A buffer mechanism is disposed between the sliding portion and the slider;

[0013] A push-pull member is mounted and connected to the slider, and is used to control the movement of the needle position plate.

[0014] The cylindrical indexing cam is driven to rotate by the driving device on the box body, and the cylindrical indexing cam is slidably connected to the sliding part of the slider, and the slider is slidably connected to the guide rod. The movement of the slider along the axis of the guide rod is controlled by the cylindrical indexing cam. Before the push-pull part needs to be controlled to move, the position of the corresponding ejector pin is budgeted and set through the locking mechanism. When the slider moves quickly, the locking mechanism is used to stop and lock the slider quickly. However, the cylindrical indexing cam cannot stop immediately, and it will also control the sliding part to continue to move a certain distance. The relative displacement between the sliding part and the slider can be achieved through the buffer mechanism.

[0015] Furthermore, the locking mechanism includes:

[0016] A locking seat, movably connected to the guide rod;

[0017] There are two screw rods corresponding to two locking mechanisms;

[0018] The servo motor is connected to the screw rod;

[0019] Abutment seat, movably mounted on the locking seat;

[0020] Lock hook, movably mounted on the lock seat;

[0021] Wherein, the slider is provided with a locking groove corresponding to the locking hook.

[0022] The locking seat is slidably connected to the two guide rods. The locking seat is driven to move by a servo motor and a screw rod, and has high precision. The abutment seat is connected to the side wall of the slider, and the locking groove is placed on the upper and lower sides of the slider. The locking hook and the locking groove correspond to each other to realize the locking mechanism to lock the slider. When locked, the abutment seat and the side wall of the slider are abutted.

[0023] Furthermore, the locking mechanism further comprises:

[0024] A movable seat is placed in the locking seat;

[0025] a first spring, disposed between the movable seat and the abutting seat;

[0026] A telescopic column is installed and connected to the abutment seat, and the telescopic column passes through the movable seat;

[0027] a damper, corresponding to the telescopic column;

[0028] a second spring, respectively abutting against the telescopic column and the locking seat;

[0029] A snap-fit ​​mechanism, used to keep the locking mechanism in an unlocked state;

[0030] The lock hook is movably hinged to the movable seat, the lock hook is provided with a sliding groove, the abutment seat is provided with a sliding column corresponding to the sliding groove, and the lock hook is V-shaped.

[0031] When the slider is locked, the locking hook is in the open state, and the locking hook and the locking slot are locked.

[0032] Furthermore, the fastening mechanism includes:

[0033] The first motor is installed in the locking seat and is placed on one side of the movable seat;

[0034] a cam seat mounted on the output shaft of the first motor;

[0035] A buckle is movably mounted in the locking seat, one end of the buckle is provided with a buckle portion corresponding to the movable seat, and the other end of the buckle is provided with a pressing portion corresponding to the abutment seat;

[0036] The third spring is against the buckle.

[0037] When the locking seat is separated from the slider, the first motor controls the rotation of the cam seat, which pushes the movable seat toward the abutment seat. The second spring controls the abutment seat to move outward, and the gap between the movable seat and the abutment seat is reduced, thereby opening the lock hook. When the latch engages with the movable seat and the abutment seat, the cam seat is controlled to return to its original position.

[0038] Furthermore, the locking seat is provided with an internal threaded seat connected to the corresponding screw rod, and the internal threaded seat is installed and connected to the locking seat.

[0039] The internal threaded seats of the respective locking seats are connected to the screw rod to ensure that the two locking seats can achieve independent control movement.

[0040] Furthermore, the buffer mechanism includes:

[0041] A rotating seat is hinged to the slider;

[0042] Push plates, evenly distributed on the outside of the rotating seat;

[0043] Reset columns are placed on both sides of the push plate;

[0044] a fourth spring, abutting against the reset post;

[0045] A fixing mechanism is placed between the rotating seat and the slider;

[0046] The axis between the sliding portion and the rotating seat is parallel. When the rotating seat is in a fixed state, the plane formed by the axis of the rotating seat and the axis of the sliding portion is perpendicular to the axis of the guide rod.

[0047] When the slider stops moving, the sliding part and the slider move relative to each other, causing the rotating seat to rotate and the push plate to deflect. Sensors are set on both sides of the push plate to detect the status of the push plate. When the locking mechanism controls the slider to stop quickly, it will cause the rotating seat to rotate to the right first, and then rotate to the left when the sliding part continues to move. The reset column and the fourth spring facilitate the reset of the rotating seat. When the slider is locked, the sliding part continues to be controlled to move by the cylindrical indexing cam, so that the plane formed by the axis of the rotating seat and the axis of the sliding part is perpendicular to the axis of the guide rod, and then it is fixed by the fixing mechanism to ensure the stability between the slider and the cylindrical indexing cam.

[0048] Furthermore, the fixing mechanism includes:

[0049] A fixing buckle, movably connected to the slider;

[0050] The electromagnets are respectively installed on the fixing buckle and the slider and correspond to each other;

[0051] Wherein, the rotating seat is provided with a fixing groove corresponding to the fixing buckle.

[0052] The magnetic field interaction is generated by two electromagnets. When the fixation needs to be released, the fixing buckle shrinks and separates from the fixing slot. When the fixation needs to be fixed, the magnetic force acts on the fixing buckle. When the rotating base rotates, it corresponds to the fixing buckle to achieve the fixation of the rotating base.

[0053] The present application also provides a control method for a color changing box for improving needle stopping accuracy, the specific steps comprising:

[0054] S1, when the slider needs to move to one side, adjust the locking seat on the corresponding side to release the fixation between the rotating seat and the slider, and the driving device controls the cylindrical indexing cam to rotate and push the slider to move;

[0055] S2, when the slider abuts against the abutment seat and pushes the abutment seat to move, the locking hook hooks the slider, and the slider is quickly stopped by the locking hook and the abutment seat to complete the needle stopping. If the rotation angle of the rotating seat deviates after the needle stops, the cylindrical indexing cam controls the sliding part to move to the fixing mechanism to fix the rotating seat.

[0056] Before the slider moves, the locking seat unlocks the slider, which facilitates the rapid movement of the slider. When the slider abuts against the abutment seat, the locking mechanism can quickly lock the slider, thereby improving the needle stopping speed and accuracy.

[0057] The beneficial effects of this application are:

[0058] 1. When it is necessary to control the movement of the push-pull part, the position of the corresponding ejector pin is set by the locking mechanism. When the slider moves quickly, the locking mechanism is used to quickly stop and lock the slider. The relative displacement between the sliding part and the slider can be achieved through the buffer mechanism.

[0059] 2. When the slider abuts against the abutting seat and moves, it is opened through the snap-fit ​​mechanism, and the first spring abuts against the movable seat, pushing the movable seat to move, so that the lock hook quickly locks the lock slot.

[0060] 3. When the locking seat is separated from the slider, the cam seat rotates to push the movable seat toward the abutment seat, controlling the abutment seat to move outward. At the same time, the distance between the movable seat and the abutment seat becomes smaller, thereby realizing the opening of the lock hook.

[0061] 4. The relative displacement between the sliding part and the slider can be achieved through the buffer mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a front structural diagram of the color change box of this application;

[0063] Figure 2 This is a schematic diagram of the rear view structure of the color change box of this application;

[0064] Figure 3 This is a schematic structural diagram of the locking mechanism of this application;

[0065] Figure 4 For this application Figure 3 Structural diagram at AA of FIG.

[0066] Figure 5 This is a schematic structural diagram of the slider of this application;

[0067] Reference numerals in the figure are: 100, housing; 110, driving device; 200, cylindrical indexing cam; 300, guide rod; 400, slider; 410, sliding portion; 420, lock groove; 500, locking mechanism; 510, locking seat; 511, internal thread seat; 520, screw rod; 530, servo motor; 540, abutment seat; 541, telescopic column; 542, damper; 543, second spring; 544, sliding column; 550, lock hook; 551, slide groove ;560, movable seat; 561, first spring; 570, snap-fitting mechanism; 571, first motor; 572, cam seat; 573, snap-fitting member; 574, snap-fitting portion; 575, pressing portion; 576, third spring; 600, buffering mechanism; 610, rotating seat; 611, fixing groove; 620, push plate; 630, reset column; 640, fourth spring; 650, fixing mechanism; 651, fixing buckle; 652, electromagnet; 700, push-pull member. DETAILED DESCRIPTION

[0068] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0069] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0070] The following provides a detailed description of the embodiments of the present application through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0071] Example 1:

[0072] like Figure 1-Figure 5 As shown, the embodiment of the present application provides a color changing box with improved needle stopping accuracy, comprising:

[0073] The box body 100 is provided with a driving device 110;

[0074] The cylindrical indexing cam 200 is installed in the housing 100 and is connected to the driving device 110;

[0075] Two guide rods 300 are provided and installed in the box body 100, and the axis of the guide rod 300 is parallel to the axis of the cylindrical indexing cam 200;

[0076] The slider 400 is mounted on the guide rod 300 and is provided with a sliding portion 410 corresponding to the cylindrical indexing cam 200;

[0077] The locking mechanisms 500 are respectively placed on both sides of the slider 400, and the locking mechanisms 500 are used to lock the slider 400;

[0078] The buffer mechanism 600 is disposed between the sliding portion 410 and the slider 400;

[0079] The push-pull member 700 is mounted and connected to the slider 400 , and is used to control the movement of the needle position plate.

[0080] The cylindrical indexing cam 200 is driven to rotate by the driving device 110 on the box body 100, and the cylindrical indexing cam 200 is slidably connected to the sliding part 410 of the slider 400, and the slider 400 is slidably connected to the guide rod 300. The cylindrical indexing cam 200 controls the slider 400 to move along the axial direction of the guide rod 300. Before it is necessary to control the movement of the push-pull member 700, the position of the corresponding ejector pin is budgeted and set by the locking mechanism 500. When the slider 400 moves quickly, the locking mechanism 500 is used to quickly stop and lock the slider 400. However, the cylindrical indexing cam 200 cannot stop immediately. It will also control the sliding part 410 to continue to move a certain distance. The relative displacement between the sliding part 410 and the slider 400 can be achieved through the buffer mechanism 600.

[0081] Example 2:

[0082] like Figure 1-Figure 4 As shown, the embodiment of the present application provides a color changing box with improved needle stopping accuracy. In addition to the above technical features, the locking mechanism 500 further includes:

[0083] The locking seat 510 is movably connected to the guide rod 300;

[0084] There are two screw rods 520 corresponding to the two locking mechanisms 500;

[0085] The servo motor 530 is installed and connected to the screw rod 520;

[0086] The abutment seat 540 is movably mounted on the locking seat 510;

[0087] The lock hook 550 is movably mounted on the lock base 510;

[0088] The slider 400 is provided with a locking groove 420 corresponding to the locking hook 550 .

[0089] The locking seat 510 is slidably connected to the two guide rods 300. The locking seat 510 is driven to move by the servo motor 530 and the screw rod 520 with high precision. The abutment seat 540 is connected to the side wall of the slider 400. The locking groove 420 is placed on the upper and lower sides of the slider 400. The locking hook 550 corresponds to the locking groove 420 to realize the locking mechanism 500 to lock the slider 400. When locked, the abutment seat 540 abuts against the side wall of the slider 400.

[0090] Furthermore, the locking mechanism 500 further includes:

[0091] The movable seat 560 is placed in the locking seat 510;

[0092] A first spring 561 is disposed between the movable seat 560 and the abutting seat 540;

[0093] The telescopic column 541 is installed and connected to the abutment seat 540, and the telescopic column 541 passes through the movable seat 560;

[0094] Damper 542, corresponding to telescopic column 541;

[0095] The second spring 543 is respectively against the telescopic column 541 and the locking seat 510;

[0096] The locking mechanism 570 is used to keep the locking mechanism 500 in an unlocked state;

[0097] The locking hook 550 is movably hinged to the movable seat 560 . The locking hook 550 is provided with a sliding groove 551 . The abutting seat 540 is provided with a sliding column 544 corresponding to the sliding groove 551 . The locking hook 550 is V-shaped.

[0098] When the slider 400 abuts against the abutment seat 540 of the locking mechanism 500, the buckling mechanism 570 controls the abutment seat 540 to extend and the lock hook 550 to open. When the slider 400 abuts against the abutment seat 540 and moves, the buckling mechanism 570 opens and abuts against the movable seat 560 through the first spring 561, pushing the movable seat 560 to move, so that the lock hook 550 quickly locks the lock groove 420. The tension of the first spring 561 and the second spring 543 are different, and the slider 400 is finally stabilized when the slider 400 abuts against the locking seat 510 after being locked. The second spring 543 acts on the abutment seat 540. 0, improve the stability between the locking seat 510 and the slider 400 after locking, provide buffering performance of the abutment seat 540 through the damper 542, reduce the rigid collision between the slider 400 and the locking seat 510, and at the same time provide a buffering stroke of less than 4mm to ensure the rapid locking and stability of the slider 400, the locking hook 550 is hinged to the movable seat 560, and the locking hook 550 and the abutment seat 540 are hinged through the sliding groove 551 and the sliding column 544, so that when the locking mechanism 500 does not lock the slider 400, the locking hook 550 is in an open state, ensuring the stable cooperation between the locking hook 550 and the locking groove 420.

[0099] Furthermore, the fastening mechanism 570 includes:

[0100] The first motor 571 is installed in the locking seat 510 and is placed on one side of the movable seat 560;

[0101] The cam seat 572 is mounted on the output shaft of the first motor 571;

[0102] A latch 573 is movably mounted in the locking seat 510 . One end of the latch 573 is provided with a latch portion 574 corresponding to the movable seat 560 , and the other end of the latch 573 is provided with a pressing portion 575 corresponding to the abutment seat 540 .

[0103] The third spring 576 abuts against the latch 573 .

[0104] When the locking seat 510 is separated from the slider 400, the first motor 571 controls the cam seat 572 to rotate, and the cam seat 572 rotates to push the movable seat 560 toward the abutting seat 540. The second spring 543 controls the abutting seat 540 to move outward, and at the same time, the gap between the movable seat 560 and the abutting seat 540 is reduced, so that the lock hook 550 is opened. When the latch 573 engages with the movable seat 560 and the abutting seat 540, the cam seat 572 is controlled to return to its original position.

[0105] Example 3:

[0106] like Figure 1As shown, an embodiment of the present application provides a color changing box that improves needle stopping accuracy. In addition to the above-mentioned technical features, the locking seat 510 is further provided with an internal threaded seat 511 connected to the corresponding screw rod 520, and the internal threaded seat 511 is installed and connected to the locking seat 510.

[0107] The internal threaded seats 511 of the respective locking seats 510 are connected to the screw rod 520 to ensure that the two locking seats 510 can achieve independent control movement.

[0108] Example 4:

[0109] like Figure 2 、 Figure 5 As shown, the embodiment of the present application provides a color changing box with improved needle stopping accuracy. In addition to the above technical features, the buffer mechanism 600 further includes:

[0110] The rotating seat 610 is hinged to the slider 400;

[0111] Push plates 620 are evenly distributed on the outside of the rotating seat 610;

[0112] Reset posts 630 are placed on both sides of the push plate 620;

[0113] The fourth spring 640 abuts against the reset post 630;

[0114] The fixing mechanism 650 is placed between the rotating seat 610 and the slider 400;

[0115] The axis between the sliding portion 410 and the rotating seat 610 is parallel. When the rotating seat 610 is fixed, the plane formed by the axis of the rotating seat 610 and the axis of the sliding portion 410 is perpendicular to the axis of the guide rod 300 .

[0116] When the slider 400 stops moving, the sliding part 410 and the slider 400 move relative to each other, causing the rotating seat 610 to rotate and the push plate 620 to deflect. Sensors are provided on both sides of the push plate 620 to detect the state of the push plate 620. When the locking mechanism 500 controls the slider 400 to stop quickly, the rotating seat 610 will first rotate to the right, and then rotate to the left while the sliding part 410 continues to move. The reset column 630 and the fourth spring 640 facilitate the reset of the rotating seat 610. When the slider 400 is locked, the sliding part 410 continues to be controlled to move by the cylindrical indexing cam 200, so that the plane formed by the axis of the rotating seat 610 and the axis of the sliding part 410 is perpendicular to the axis of the guide rod 300, and then fixed by the fixing mechanism 650 to ensure the stability between the slider 400 and the cylindrical indexing cam 200.

[0117] Furthermore, the fixing mechanism 650 includes:

[0118] A fixing buckle 651 is movably connected to the slider 400;

[0119] The electromagnet 652 is mounted on the fixing buckle 651 and the slider 400 respectively, and corresponds to each other;

[0120] The rotating seat 610 is provided with a fixing groove 611 corresponding to the fixing buckle 651 .

[0121] The two electromagnets 652 generate magnetic field interaction. When the fixation needs to be released, the fixing buckle 651 contracts and separates from the fixing slot 611. When the fixation needs to be made, the magnetic force acts on the fixing buckle 651. When the rotating base 610 rotates, the fixing buckle 651 corresponds to the fixing buckle 651 to fix the rotating base 610.

[0122] Example 5:

[0123] The present application also provides a control method for a color changing box for improving needle stopping accuracy, the specific steps comprising:

[0124] S1, when the slider 400 needs to move to one side, the locking seat 510 on the corresponding side is adjusted to release the fixation between the rotating seat 610 and the slider 400, and the driving device 110 controls the cylindrical indexing cam 200 to rotate and push the slider 400 to move;

[0125] S2, when the slider 400 abuts against the abutment seat 540 and pushes the abutment seat 540 to move, the locking hook 550 hooks the slider 400, and the slider 400 is quickly stopped by the locking hook 550 and the abutment seat 540 to complete the needle stopping. If the rotation angle of the rotating seat 610 deviates after the needle stops, the cylindrical indexing cam 200 controls the sliding part 410 to move to the fixing mechanism 650 to fix the rotating seat 610.

[0126] Before the slider 400 moves, the locking seat 510 releases the lock on the slider 400, which facilitates the rapid movement of the slider 400. When the slider 400 abuts against the abutment seat 540, the locking mechanism 500 can quickly lock the slider 400, thereby improving the needle stopping speed and accuracy.

[0127] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0128] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A color changing box for improving needle stopping accuracy, characterized in that: include: A box body (100), wherein the box body (100) is provided with a driving device (110); A cylindrical indexing cam (200) is installed in the housing (100) and is connected to the driving device (110); Two guide rods (300) are provided and installed in the box (100), and the axes of the guide rods (300) are parallel to the axis of the cylindrical indexing cam (200); A slider (400) is mounted on the guide rod (300), wherein the slider (400) is provided with a sliding portion (410) corresponding to the cylindrical indexing cam (200); A locking mechanism (500) is respectively placed on both sides of the slider (400), and the locking mechanism (500) is used to lock the slider (400); A buffer mechanism (600) is disposed between the sliding portion (410) and the slider (400); A push-pull member (700) is mounted and connected to the slider (400), and the push-pull member (700) is used to control the movement of the needle position plate.

2. The color-changing box for improving needle stopping accuracy according to claim 1, characterized in that: The locking mechanism (500) comprises: A locking seat (510) is movably connected to the guide rod (300); There are two screw rods (520) corresponding to the two locking mechanisms (500); A servo motor (530) is mounted and connected to the screw rod (520); An abutting seat (540) is movably mounted on the locking seat (510); A lock hook (550) is movably mounted on the lock base (510); Wherein, the slider (400) is provided with a locking groove (420) corresponding to the locking hook (550).

3. The color-changing box for improving needle stopping accuracy according to claim 2, characterized in that: The locking mechanism (500) further comprises: A movable seat (560) is placed in the locking seat (510); A first spring (561) is placed between the movable seat (560) and the abutting seat (540); A telescopic column (541) is installed and connected to the abutment seat (540), and the telescopic column (541) passes through the movable seat (560); a damper (542), corresponding to the telescopic column (541); The second spring (543) is respectively against the telescopic column (541) and the locking seat (510); A locking mechanism (570) for keeping the locking mechanism (500) in an unlocked state; The locking hook (550) is movably hinged to the movable seat (560), the locking hook (550) is provided with a sliding groove (551), the abutting seat (540) is provided with a sliding column (544) corresponding to the sliding groove (551), and the locking hook (550) is V-shaped.

4. The color-changing box for improving needle stopping accuracy according to claim 3, characterized in that: The fastening mechanism (570) comprises: A first motor (571) is installed in the locking seat (510) and is placed on one side of the movable seat (560); A cam seat (572) is mounted on the output shaft of the first motor (571); A snap member (573) is movably mounted in the locking seat (510), one end of the snap member (573) is provided with a snap portion (574) corresponding to the movable seat (560), and the other end of the snap member (573) is provided with a pressing portion (575) corresponding to the abutting seat (540); The third spring (576) is against the latch (573).

5. The color-changing box for improving needle stopping accuracy according to claim 4, characterized in that: The locking seat (510) is provided with an internal thread seat (511) connected to the corresponding screw rod (520), and the internal thread seat (511) is installed and connected to the locking seat (510).

6. The color-changing box for improving needle stopping accuracy according to claim 5, characterized in that: The buffer mechanism (600) comprises: A rotating seat (610) is hinged to the slider (400); Push plates (620) are evenly distributed on the outside of the rotating seat (610); Reset posts (630) are placed on both sides of the push plate (620); a fourth spring (640) abutting against the reset post (630); A fixing mechanism (650) is placed between the rotating seat (610) and the slider (400); The axis between the sliding portion (410) and the rotating seat (610) is parallel, and when the rotating seat (610) is in a fixed state, the plane formed by the axis of the rotating seat (610) and the axis of the sliding portion (410) is perpendicular to the axis of the guide rod (300).

7. The color-changing box for improving needle stopping accuracy according to claim 6, characterized in that: The fixing mechanism (650) comprises: A fixing buckle (651) movably connected to the slider (400); The electromagnet (652) is respectively mounted on the fixing buckle (651) and the slider (400) and corresponds to each other; Wherein, the rotating seat (610) is provided with a fixing groove (611) corresponding to the fixing buckle (651).

8. A control method for a color-changing box for improving needle stopping accuracy according to claim 7, characterized in that: The specific steps include: S1, when the slider (400) needs to move to one side, the locking seat (510) on the corresponding side is adjusted to release the fixation between the rotating seat (610) and the slider (400), and the driving device (110) controls the cylindrical indexing cam (200) to rotate and push the slider (400) to move; S2, when the slider (400) abuts against the abutment seat (540) and pushes the abutment seat (540) to move, the locking hook (550) hooks the slider (400), and the slider (400) is quickly stopped by the locking hook (550) and the abutment seat (540) to complete the needle stopping. If the rotation angle of the rotating seat (610) deviates after the needle stops, the cylindrical indexing cam (200) controls the sliding part (410) to move to the fixing mechanism (650) to fix the rotating seat (610).

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