An automatic roll changing based motion bandage winder

Abstract

The application relates to the field of sports bandage production, in particular to a sports bandage winding machine based on automatic roll changing, which comprises a machine base and further comprises: a guide roller set arranged on the machine base, the guide roller set comprising two first guide rollers rotatably arranged on the machine base and a second guide roller movably arranged on the machine base, the second guide roller being connected with an elastic supporting mechanism arranged on the machine base; a first air expansion shaft and a second air expansion shaft movably arranged on the machine base and distributed in an up-down mode, the two air expansion shafts being used for alternately winding the bandage; and the elastic supporting mechanism comprising a supporting plate and two groups of elastic telescopic rods; the elastic telescopic rods are arranged to support the sports bandage; under the condition that the front-end bandage production equipment does not stop, the elastic telescopic rods can play a tension supplementing role on the sports bandage, the problem of bandage relaxation and drooping is avoided, the problems of bandage surface wrinkles, interlayer misplacement, the end face neatness of subsequent winding and the tightness of the winding core are prevented.

Description

Technical Field

[0001] This invention relates to the field of sports bandage production, specifically a sports bandage winding machine based on automatic roll changing. Background Technology

[0002] Sports bandages are an indispensable protective material in the field of sports medicine, mainly used for joint fixation, muscle support, injury prevention, and sports protection. Self-adhesive sports bandages, in particular, are popular because they do not have an adhesive layer; the bandage adheres only to itself and not to the skin or hair, eliminating the need to distinguish between the front and back. On modern continuous production lines, these bandages are typically produced at high speed in rolls, requiring specialized winding equipment at the rear to rewind and shape them. To improve overall production efficiency, existing equipment generally employs non-stop automatic roll-changing technology. This means that the front-end extrusion, weaving, or composite production units operate continuously, while the rear winding station automatically switches between full and empty rolls, achieving seamless continuous operation.

[0003] However, because the front-end equipment maintains a constant output speed, the motion bandage loses its rear-end tension constraint in the brief period between the moment of cutting and the establishment of new core traction, causing longitudinal slack and sagging of the tape. This slack not only causes wrinkles and interlayer misalignment on the bandage surface, affecting the end face neatness and core tightness of subsequent winding; but also, when the transverse cutter cuts the bandage during dynamic operation, a complex "saw effect" is generated between the blade and the high-speed moving elastic material. The cutter does not complete an ideal pure shearing action, but applies a transverse pulling force to the fibers in relative sliding, forcibly stretching the elastic fibers or warp and weft yarns of the gauze before breaking, ultimately separating by a snap rather than a neat cut. This results in defects such as fiber pull-out, frayed edges, and increased debris at the cut. In severe cases, incomplete cutting in some areas can even lead to tangled threads or intertwined strands, seriously affecting the end face flatness and product appearance quality of subsequent winding. Summary of the Invention

[0004] The purpose of this invention is to provide a motion bandage winding machine based on automatic roll changing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A motion bandage winding machine based on automatic roll changing includes a base and further includes: A guide roller assembly is provided on the machine base. The guide roller assembly includes two first guide rollers rotatably mounted on the machine base and a second guide roller movably provided on the machine base. The second guide roller is connected to an elastic support mechanism provided on the machine base. The first and second air shafts, which are mounted on the base and distributed vertically, are used to take turns winding up the bandage. The vertical arm is mounted on the base and can move along the length of the base. It can also drive the first and second air shafts to move vertically through a transmission mechanism. The vertical arm is also connected to the elastic support mechanism through a follower mechanism. When the second air shaft reaches a preset value for the amount of bandage wound by the cutter mounted on the base, the vertical arm drives the first air shaft to move downward through the transmission mechanism, so that the core on the first air shaft adheres to the bandage on the second air shaft, and the second air shaft stops rotating, while the first air shaft rotates, so that a peeling section facing the cutter side is formed between the first air shaft and the second air shaft. At the same time, the follower mechanism is triggered, which can cause the elastic support mechanism to store elastic potential energy. When the cutter cuts the peeling section, the elastic support mechanism compensates for the tension of the bandage.

[0006] As described above, the motion bandage winding machine based on automatic roll changing includes an elastic support mechanism comprising a support plate movably disposed within the machine base and connected to the follower mechanism, and two sets of elastic telescopic rods mounted on the support plate, wherein the movable end of the elastic telescopic rod is rotatably connected to the second guide roller.

[0007] The motion bandage winding machine based on automatic roll changing as described above: the follow-up mechanism includes a rotating shaft rotatably installed in the machine base, a disc fixed to one end of the rotating shaft facing the support plate, and a connecting rod connecting the disc and the support plate.

[0008] As described above, the motion bandage winding machine based on automatic roll changing has a sliding fit structure between the rotating shaft and the vertical arm, one end of the connecting rod is rotatably connected to the eccentric part of the disc, and the other end is rotatably connected to the support plate.

[0009] As described above, the automatic roll-changing motion bandage winding machine includes a sliding sleeve connected to the upright arm, the sliding sleeve slidingly engaging with the rotating shaft, and a drive column on the sliding sleeve. The outer wall of the rotating shaft is provided with a groove adapted to the drive column, the drive column extending into the groove and slidingly connected to the rotating shaft, and the groove is spirally arranged.

[0010] As described above, the automatic roll-changing motion bandage winding machine includes a transmission mechanism comprising two columns installed within the machine base and a first mounting base and a second mounting base slidably connected to the two columns. The first air shaft and the second air shaft are respectively mounted on the sides of the first mounting base and the second mounting base.

[0011] As described above, the motion bandage winding machine based on automatic roll changing has a first driven plate fixed on the side of the first mounting base, and a first protrusion that cooperates with the first driven plate on the upright arm. The first driven plate is provided with a first inclined groove and a first straight groove that are connected to and adapted to the first protrusion. When the vertical arm moves toward the first air shaft and the second air shaft, and the first protrusion slides in the first inclined groove, it can cause the first driven plate to move down, so that the first air shaft moves closer to the second air shaft.

[0012] As described above, the motion bandage winding machine based on automatic roll changing has a second driven plate fixed to the side of the second mounting base, and a second protrusion that cooperates with the second driven plate is provided on the vertical arm. The second driven plate is provided with a second straight groove and a second inclined groove that are connected to and adapted to the second protrusion. During the movement of the vertical arm toward the first and second air shafts, when the first protrusion moves in the first inclined groove, the second protrusion slides in the second straight groove. When the first protrusion enters the first inclined groove, the second protrusion enters the second inclined groove, and the second protrusion can cause the second driven plate to move down through the second inclined groove, so that the second air shaft moves away from the first air shaft.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention supports the sports bandage by setting up an elastic telescopic rod. When changing rolls, the first and second air shafts stop rotating, while the elastic telescopic rod can store elastic potential energy in advance. This allows the elastic telescopic rod to supplement the tension of the sports bandage during the formation of the peeling section and the cutting process of the peeling section by the cutter, without stopping the front-end bandage production equipment. This prevents the bandage from becoming loose and sagging, and avoids wrinkles and misalignment on the bandage surface, which would affect the end face neatness and core tightness of subsequent winding. Secondly, through the tension compensation of the elastic telescopic rod, after the peeling section is formed, both the first and second air expansion shafts can stop rotating, so that the cutter can stably cut the peeling section in a stationary state, avoiding complex "saw effect" and improving the flatness of the end face and the appearance quality of the product in subsequent winding. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one embodiment of a motion bandage winding machine based on automatic roll changing.

[0015] Figure 2 This is a front view of one embodiment of a motion bandage winding machine based on automatic roll changing.

[0016] Figure 3 This is a side view of one embodiment of a motion bandage winding machine based on automatic roll changing.

[0017] Figure 4 This is a schematic diagram of the transmission mechanism in one embodiment of a motion bandage winding machine based on automatic roll changing.

[0018] Figure 5 An exploded view of the follower mechanism in one embodiment of a motion bandage winding machine based on automatic roll changing.

[0019] Figure 6 This is a schematic diagram of the roll-changing state of the first air shaft and the second air shaft in one embodiment of a motion bandage winding machine based on automatic roll changing.

[0020] In the diagram: 1. Base; 2. First guide roller; 3. Second guide roller; 4. Support plate; 5. Elastic telescopic rod; 6. First air shaft; 7. Second air shaft; 8. Column; 9. First mounting base; 10. Second mounting base; 11. First driven plate; 1101. First inclined groove; 1102. First straight groove; 12. Second driven plate; 1201. Second straight groove; 1202. Second inclined groove; 13. Linear drive module; 14. Arm; 1401. First protrusion; 1402. Second protrusion; 15. Rotating shaft; 1501. Groove; 16. Disc; 17. Connecting rod; 18. Cutter; 19. Sliding sleeve; 1901. Drive column. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0023] Please see Figures 1-6 In this embodiment, a motion bandage winding machine based on automatic roll changing includes a base 1, and further includes: A guide roller assembly is provided on the machine base 1. The guide roller assembly includes two first guide rollers 2 rotatably mounted on the machine base 1 and a second guide roller 3 movably provided on the machine base 1. The second guide roller 3 is connected to an elastic support mechanism provided on the machine base 1. The first air shaft 6 and the second air shaft 7 are mounted on the base 1 and distributed vertically. They are used to take turns winding up the bandage. The vertical arm 14 is movably mounted on the base 1. The vertical arm 14 can move along the length of the base 1 and drive the first air shaft 6 and the second air shaft 7 to move in the vertical direction through the transmission mechanism. The vertical arm 14 is also connected to the elastic support mechanism through the follower mechanism. When the second air shaft 7 reaches a preset value for the amount of bandage wound by the cutter 18 mounted on the base 1, the upright arm 14 drives the first air shaft 6 to move downward through the transmission mechanism, so that the core on the first air shaft 6 adheres to the bandage on the second air shaft 7, and the second air shaft 7 stops rotating, while the first air shaft 6 rotates, so that a peeling section facing the cutter 18 is formed between the first air shaft 6 and the second air shaft 7. At the same time, the follower mechanism is triggered, which can cause the elastic support mechanism to store elastic potential energy. When the cutter 18 cuts the peeling section, the elastic support mechanism compensates for the tension of the bandage.

[0024] In this embodiment, it should be noted that, see [reference] Figure 6 The peeling section is inclined, and the cutter 18 moves along the width direction of the base 1 to cut the peeling section, and the cutter 18 should have orientation adjustment. Preferably, the cutter 18 is perpendicular to the stripping section to improve the flatness of the cut end face.

[0025] In actual use, both the first air shaft 6 and the second air shaft 7 need to be fitted with roll cores. When the preset value, i.e. the number of wrapping bandage turns, reaches the preset number of turns, the roll needs to be changed. Furthermore, after the first air shaft 6 or the second air shaft 7 is fully loaded, the workers remove the core and bandages from it and then put on a new core. This core is a pre-coated core, that is, the outer wall of the core is pre-attached with double-sided tape and covered with release paper. It should be emphasized that, see Figure 3 At this time, the second air shaft 7 winds up the motion bandage. The second air shaft 7 rotates counterclockwise. When it is necessary to change the roll, the vertical arm 14 moves along the length direction of the machine base 1. The machine base 1 is equipped with a linear drive module 13 based on a lead screw and servo motor drive, which is used to drive the vertical arm 14 to move along the length direction of the machine base 1, including two stages: In the first stage, the vertical arm 14 drives the first air shaft 6 to move downward through the transmission mechanism, so that the core on the first air shaft 6 is bonded to the bandage on the second air shaft 7 through double-sided adhesive. The second air shaft 7 stops rotating before the double-sided adhesive contacts the bandage. Then, the first air shaft 6 rotates clockwise by a certain angle, causing a section of the bandage on the second air shaft 7 to peel off, forming a peeled section facing the cutter 18 and separated from the first air shaft 6 and the second air shaft 7. During this process, the vertical arm 14 causes the elastic support mechanism to store elastic potential energy through the follow-up mechanism. Therefore, when the cutter 18 cuts the peeled section, the elastic support mechanism can compensate for the tension of the bandage while the front bandage production equipment is running, thus preventing the bandage from becoming loose. In the second stage, after the cutter 18 completes the cutting of the stripped section, the vertical arm 14 continues to move, causing the second air shaft 7 to move down and retract, so that the staff can remove the bandage and core from the second air shaft 7. At the same time, the elastic support mechanism returns to its initial state, and the first air shaft 6 (rotates clockwise) begins to wind up the bandage.

[0026] When the first air shaft 6 reaches the preset value for the amount of bandage wound, the upright arm 14 moves in the opposite direction, causing the second air shaft 7 to move upward (rotate counterclockwise), and repeat the above process to complete the bandage handover.

[0027] As a further embodiment of the present invention, please refer again. Figure 2 and Figure 3 The elastic support mechanism includes a support plate 4 movably disposed within the base 1 and connected to the follower mechanism, and two sets of elastic telescopic rods 5 installed on the support plate 4. The movable end of the elastic telescopic rod 5 is rotatably connected to the second guide roller 3.

[0028] In this embodiment, the sports bandage is as follows: Figure 3 The circuit shown bypasses two first guide rollers 2 and second guide rollers 3. During the roll changing process, the follower mechanism will cause the support plate 4 to rise, thereby compressing the spring in the elastic telescopic rod 5 to store elastic potential energy. Subsequently, during the formation of the peeling section and the cutting process of the peeling section by the cutter 18, the elastic telescopic rod 5 can compensate for the tension of the moving bandage without stopping the front bandage production equipment, so as to avoid the problem of the bandage loosening, which would cause wrinkles on the surface of the bandage and misalignment between layers, affecting the end face neatness and core tightness of subsequent winding.

[0029] Furthermore, a guide groove is provided on the inner side of the base 1, and the two ends of the support plate 4 are slidably fitted into the guide groove to guide the lifting and lowering of the support plate 4.

[0030] As a further embodiment of the present invention, please refer again. Figure 5The follower mechanism includes a rotating shaft 15 rotatably mounted in the base 1, a disk 16 fixed to one end of the rotating shaft 15 facing the support plate 4, and a connecting rod 17 connecting the disk 16 and the support plate 4; wherein, a sliding fit structure is provided between the rotating shaft 15 and the vertical arm 14, one end of the connecting rod 17 is rotatably connected to the eccentric part of the disk 16, and the other end is rotatably connected to the support plate 4.

[0031] In this embodiment, it is important to emphasize that when the second air shaft 7 needs to be replaced and the first air shaft 6 moves downward, and when the first air shaft 6 needs to be replaced and the second air shaft 7 moves upward, the sliding fit structure is triggered, which causes the rotating shaft 15 to drive the disc 16 to rotate half a revolution. Then, the disc 16 drives the support plate 4 to move upward through the connecting rod 17, so as to compress the spring in the elastic telescopic rod 5 and store elastic potential energy. In this way, tension compensation is performed on the sports bandage during the subsequent roll-changing process, and the sports bandage is prevented from loosening due to the continuous operation of the bandage production equipment at the front end.

[0032] As a further embodiment of the present invention, the sliding fit structure includes a sliding sleeve 19 connected to the upright arm 14, the sliding sleeve 19 being slidably fitted with the rotating shaft 15, and the sliding sleeve 19 being provided with a drive post 1901, the outer wall of the rotating shaft 15 being provided with a groove 1501 adapted to the drive post 1901, the drive post 1901 extending into the groove 1501 and being slidably connected to the rotating shaft 15, and the groove 1501 being spirally arranged.

[0033] When the second air shaft 7 needs to be replaced, the first air shaft 6 moves downward, that is, the vertical arm 14 moves along the length of the machine base 1 and drives the sliding sleeve 19 to slide along the axial direction of the rotating shaft 15 until the drive column 1901 reaches the midpoint of the groove 1501. During this process, the drive column 1901 slides with the rotating shaft 15 through the groove 1501, causing the rotating shaft 15 to rotate 180°. The disc 16 drives the support plate 4 to rise through the connecting rod 17, so that when the bandage is cut, the first air shaft 6 and the second air shaft 7 stop rotating and the front bandage production equipment does not stop, the elastic telescopic rod 5 can supplement the tension of the bandage.

[0034] To address this, the present invention provides support for the sports bandage by setting an elastic telescopic rod 5. During roll changing, the first air shaft 6 and the second air shaft 7 stop rotating, while the elastic telescopic rod 5 can store elastic potential energy in advance. This allows the elastic telescopic rod 5 to supplement the tension of the sports bandage during the formation of the peeling section and the cutting process of the peeling section by the cutter 18, without stopping the front-end bandage production equipment. This prevents the bandage from becoming loose and sagging, and avoids wrinkles and misalignment on the bandage surface, which would affect the end face neatness and core tightness of subsequent winding.

[0035] As a further embodiment of the present invention, please refer again. Figure 4 and Figure 5 The transmission mechanism includes two columns 8 installed in the base 1 and a first mounting seat 9 and a second mounting seat 10 slidably connected to the two columns 8; wherein the first air shaft 6 and the second air shaft 7 are respectively installed on the sides of the first mounting seat 9 and the second mounting seat 10.

[0036] As a further embodiment of the present invention, a first driven plate 11 is fixed to the side of the first mounting base 9, and a first protrusion 1401 that cooperates with the first driven plate 11 is provided on the upright arm 14. The first driven plate 11 is provided with a first inclined groove 1101 and a first straight groove 1102 that are connected to and adapted to the first protrusion 1401. When the upright arm 14 moves toward the first air shaft 6 and the second air shaft 7, the first protrusion 1401 slides in the first inclined groove 1101, which can cause the first driven plate 11 to move down, so that the first air shaft 6 moves closer to the second air shaft 7.

[0037] As a further embodiment of the present invention, a second driven plate 12 is fixed to the side of the second mounting base 10. The upright arm 14 is provided with a second protrusion 1402 that cooperates with the second driven plate 12. The second driven plate 12 is provided with a second straight groove 1201 and a second inclined groove 1202 that are connected to and adapted to the second protrusion 1402. During the movement of the upright arm 14 toward the first air shaft 6 and the second air shaft 7, when the first protrusion 1401 moves in the first inclined groove 1101, the second protrusion 1402 slides in the second straight groove 1201. When the first protrusion 1401 enters the first inclined groove 1101, the second protrusion 1402 enters the second inclined groove 1202. The second protrusion 1402 can cause the second driven plate 12 to move down through the second inclined groove 1202, so that the second air shaft 7 moves away from the first air shaft 6.

[0038] With attachment Figure 3 Taking the state shown as an example, at this time, the second air shaft 7 participates in the winding work. When the amount of the second air shaft 7 winding the bandage reaches the preset value, the vertical arm 14 moves along the length direction of the base 1 toward the first air shaft 6 and the second air shaft 7, and accordingly; In the first stage, the first protrusion 1401 slides in the first inclined groove 1101 and slides with the first driven plate 11, so that the first driven plate 11 drives the first mounting seat 9 and the first air shaft 6 to move down, while the second protrusion 1402 slides in the second straight groove 1201 and the second driven plate 12 does not move. Thus, the core on the first air shaft 6 can be bonded to the bandage on the second air shaft 7. In the second stage, after the cutter 18 completes the cutting of the stripped section, the vertical arm 14 continues to move toward the first air shaft 6 and the second air shaft 7. The first protrusion 1401 slides in the first straight groove 1102, while the first air shaft 6 maintains its current height and winds up the bandage. The second protrusion 1402 enters the second inclined groove 1202 and slides with the second driven plate 12, causing the second driven plate 12 to drive the second mounting base 10 and the second air shaft 7 to move down, so that the workers can remove the core along with the bandage from the second air shaft 7 and put a new core on the second air shaft 7 for later use. To meet a higher degree of automated production, a robot arm can be set on one side of the machine base 1 to complete the core loading and unloading work.

[0039] When the first air shaft 6 reaches the preset value for the amount of bandage wound, the upright arm 14 moves away from the first air shaft 6 and the second air shaft 7, causing the second air shaft 7 and the first air shaft 6 to rise successively, with the second air shaft 7 participating in the bandage winding work. This cycle repeats, allowing the first air shaft 6 and the second air shaft 7 to take turns participating in the winding work, thus realizing the automatic roll changing function.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A motion bandage winding machine based on automatic roll changing, comprising a machine base; Its features are, Also includes: A guide roller assembly is provided on the machine base. The guide roller assembly includes two first guide rollers rotatably mounted on the machine base and a second guide roller movably provided on the machine base. The second guide roller is connected to an elastic support mechanism provided on the machine base. The first and second air shafts, which are mounted on the base and distributed vertically, are used to take turns winding up the bandage. The vertical arm is mounted on the base and can move along the length of the base. It also drives the first and second air shafts to move vertically through a transmission mechanism. A cutting blade mounted on the machine base; The elastic support mechanism stores elastic potential energy and provides tension compensation to the bandage when the cutter cuts the stripping section.

2. The motion bandage winding machine based on automatic roll changing according to claim 1, characterized in that, The boom is connected to the elastic support mechanism via a follower mechanism. The elastic support mechanism includes a support plate movably disposed within the machine base and connected to the follower mechanism, and two sets of elastic telescopic rods mounted on the support plate. The movable end of the elastic telescopic rod is rotatably connected to the second guide roller.

3. A motion bandage winding machine based on automatic roll changing according to claim 2, characterized in that, The follower mechanism includes a rotating shaft rotatably mounted in the base, a disc fixed to one end of the rotating shaft facing the support plate, and a connecting rod connecting the disc and the support plate.

4. A motion bandage winding machine based on automatic roll changing according to claim 3, characterized in that, The rotating shaft and the vertical arm are provided with a sliding fit structure. One end of the connecting rod is rotatably connected to the eccentric part of the disc, and the other end is rotatably connected to the support plate.

5. A motion bandage winding machine based on automatic roll changing according to claim 4, characterized in that, The sliding fit structure includes a sliding sleeve connected to the upright arm, the sliding sleeve slidingly fitting with the rotating shaft, and a drive post provided on the sliding sleeve. The outer wall of the rotating shaft is provided with a groove adapted to the drive post. The drive post extends into the groove and is slidably connected to the rotating shaft, and the groove is spirally arranged.

6. A motion bandage winding machine based on automatic roll changing according to claim 1, characterized in that, The transmission mechanism includes two columns installed in the base and a first mounting seat and a second mounting seat slidably connected to the two columns; The first air shaft and the second air shaft are respectively mounted on the sides of the first mounting base and the second mounting base.

7. A motion bandage winding machine based on automatic roll changing according to claim 6, characterized in that, A first driven plate is fixed to the side of the first mounting base, and a first protrusion that cooperates with the first driven plate is provided on the upright arm. The first driven plate is provided with a first inclined groove and a first straight groove that are connected to and adapted to the first protrusion. When the vertical arm moves toward the first air shaft and the second air shaft, and the first protrusion slides in the first inclined groove, it can cause the first driven plate to move down, so that the first air shaft moves closer to the second air shaft.

8. A motion bandage winding machine based on automatic roll changing according to claim 7, characterized in that, The second mounting base has a second driven plate fixed to its side. The vertical arm is provided with a second protrusion that cooperates with the second driven plate. The second driven plate is provided with a second straight groove and a second inclined groove that are connected to and adapted to the second protrusion. During the movement of the vertical arm toward the first and second air shafts, when the first protrusion moves in the first inclined groove, the second protrusion slides in the second straight groove. When the first protrusion enters the first inclined groove, the second protrusion enters the second inclined groove, and the second protrusion can cause the second driven plate to move down through the second inclined groove, so that the second air shaft moves away from the first air shaft.

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