A tape feeding and retracting tensioning mechanism

Abstract

The present invention provides a tape feeding and retracting and tensioning mechanism, which includes a rotatable basic connecting rod located below and a total control cam for tape feeding and retracting and tensioning. The cam corresponds to the basic connecting rod, and a tape feeding cam surface, a tape retracting cam surface, and a tape tensioning cam surface are arranged along its circumferential direction. In the present invention, through the same cam and opposite eccentric settings, the tape feeding and retracting and the tape tensioning are controlled, so that when the tape is retracted, the tensioning wheel set does not interfere with the tape retracting action, and when the tensioning wheel set works, the tape feeding and retracting wheel set does not interfere with the tensioning action. It can better apply the same power to drive the tape retracting mechanism and the tensioning mechanism, and the actions are coherent, with strong synchronism and greater stability.

Description

Technical Field

[0001] The present invention relates to the field of strapping machines, and particularly to a tape feeding, tape retracting and tape tightening mechanism. Background Art

[0002] A strapping machine is a device for strapping items with a strapping tape. The entire strapping process includes steps such as tape feeding, tape retracting, tape tightening, and heat bonding. Tape feeding and tape retracting are achieved by the same pair of driving wheels and driven wheels, and tape tightening is achieved by another pair of driving wheels and driven wheels. Among them, each driven wheel is connected to an eccentric shaft and is driven to approach and move away from its driving wheel. In the tape feeding, tape retracting and tape tightening mechanism of the conventional strapping machine, the tape feeding and retracting and the tape tightening link mechanisms are respectively controlled by two cams and two sets of linkages, with a complex structure, a complicated structural layout, easy interference, and high requirements for the matching accuracy of the cams. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tape feeding, tape retracting and tape tightening mechanism that can control the tape feeding, tape retracting and tape tightening link mechanisms with the same cam. For this purpose, the present invention adopts the following technical solutions:

[0004] A tape feeding, tape retracting and tape tightening mechanism includes a tape feeding and retracting driving wheel, a tape feeding and retracting driven wheel, a tape tightening driving wheel, and a tape tightening driven wheel. The tape feeding and retracting driven wheel is connected to a first eccentric shaft, and the tape tightening driven wheel is connected to a second eccentric shaft. It is characterized in that the tape feeding, tape retracting and tape tightening mechanism includes:

[0005] A rotatable base link and a tape feeding, tape retracting and tape tightening total control cam located below. The cam corresponds to the base link, and a tape feeding cam surface, a tape retracting cam surface, and a tape tightening cam surface are arranged along its circumferential direction;

[0006] A tape feeding and retracting link assembly, one end of which is connected to the first eccentric shaft and the other end is connected to the base link;

[0007] A tape tightening link assembly, one end of which is connected to the second eccentric shaft and the other end is connected to the base link;

[0008] The eccentric direction of the first eccentric shaft relative to the tape feeding and retracting driven wheel is opposite to the eccentric direction of the second eccentric shaft relative to the tape tightening driven wheel, so that when the tape feeding and retracting driven wheel approaches the tape feeding and retracting driving wheel, the first eccentric shaft rotates in a first direction, and when the tape tightening driven wheel approaches the tape tightening driving wheel, the second eccentric shaft rotates in a second direction. The first direction and the second direction are respectively one of the clockwise direction and the counterclockwise direction and the other of them.

[0009] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use a combination of these further technical solutions:

[0010] The belt feeding and retracting tensioning mechanism is provided with an elastic member for driving the belt feeding and retracting link assembly. The working direction of the elastic member for driving the belt feeding and retracting link assembly is to make the first eccentric shaft rotate in the first direction through the belt feeding and retracting link assembly. When changing from the tensioning belt working state to the belt feeding working state and from the belt feeding working state to the belt retracting working state, the belt feeding and retracting link assembly is driven by the elastic member for driving the belt feeding and retracting link assembly to drive the first eccentric shaft to rotate in the first direction; when entering the tensioning belt working state, the cam drives the basic link to drive the second eccentric shaft to rotate in the second direction through the tensioning belt link assembly.

[0011] The parts where the basic link is connected to the belt feeding and retracting link assembly and the parts where it is connected to the tensioning belt link assembly are arranged on the first side relative to the cam, and the rotating shaft of the basic link is arranged on the second side relative to the cam; the basic link is connected with an elastic member, and the working direction of the elastic member connected to the basic link is to make the first side of the basic link rotate downward; when entering the tensioning belt working state, the tensioning belt cam surface drives the first side of the basic link to rotate upward.

[0012] The belt feeding and retracting link assembly is composed of a first rod and a second partial rod. The first end of the first rod is connected to the first eccentric shaft, and the second end is located above the basic link; the belt feeding and retracting tensioning mechanism is provided with a first elastic member, which is connected to the first rod. The working direction of the first elastic member is to make the first rod drive the first eccentric shaft to rotate in the first direction when entering the belt feeding working state, and provide belt feeding pressure to the packing belt passing between the belt feeding and retracting driving wheel and the belt feeding and retracting driven wheel through the first eccentric shaft; the upper end of the second partial rod is movably connected to the first rod, and the lower end is movably connected to the basic link; the basic link is connected with a second elastic member, and the working direction of the second elastic member is to make the first side of the basic link rotate downward, so that when changing from the belt feeding to the belt retracting working state, it drives the first side of the basic link to rotate downward. When in the belt retracting working state, it provides belt retracting pressure to the packing belt passing between the belt feeding and retracting driving wheel and the belt feeding and retracting driven wheel through the basic link, the belt feeding and retracting link assembly and the first eccentric shaft; the tensioning belt link assembly includes a third rod connected to the second eccentric shaft and a fourth rod movably connected to the basic link. A third elastic member is also arranged between the third rod and the basic link. When entering the tensioning belt working state, the cam drives the first side of the basic link to rotate upward. The basic link drives the tensioning belt link assembly to move through the third elastic member, and the tensioning belt link assembly drives the second eccentric shaft to rotate in the second direction to provide tensioning belt pressure to the packing belt passing between the tensioning belt driving wheel and the tensioning belt driven wheel.

[0013] The second part of the rod is a rod provided with an elastic member, including an upper second rod and a lower second rod. The lower second rod is rotatably connected to the base link. A fourth elastic member is connected between the upper second rod and the lower second rod. A limiting connection structure is provided between the upper second rod and the lower second rod. When the base link rotates upward on the first side to enter the working state of the tensioning belt, the cooperation of the limiting connection structure drives the movement of the feed and retreat belt link assembly, causing the first eccentric shaft to rotate in the second direction, and enabling the feed and retreat belt driving wheel and the feed and retreat belt driven wheel to exit the cooperation state during the belt retreating working state.

[0014] The third rod is a downwardly bent link and is connected with a connecting member at its lower part. The upper part of the fourth rod is connected with the connecting member. The base link is slidably connected with the lower part of the fourth rod. The fourth rod is threadedly connected with an adjusting nut. The third elastic member is sleeved outside the fourth rod and is located between the base link and the connecting member.

[0015] The lower end of the first elastic member is connected with an adjusting member fixed on the movement frame.

[0016] The upper end of the fourth elastic member is connected with an adjusting member fixed on the upper second rod.

[0017] A flat shaft section is provided at the part where the first eccentric shaft is connected with the feed and retreat belt link assembly. A long hole is provided at the end of the feed and retreat belt link assembly. The flat shaft section is inserted into the long hole to form a limiting fit. A flat shaft section is provided at the part where the second eccentric shaft is connected with the tensioning belt link assembly. A long hole is provided at the end of the tensioning belt link assembly. The flat shaft section is inserted into the long hole to form a limiting fit.

[0018] A connecting hole is provided at the upper end of the upper second rod. The second end of the first rod passes through the connecting hole. The upper second rod is connected with the first rod through the connecting hole. The first elastic member is connected to the second end of the first rod.

[0019] Due to the adoption of the technical solution of the present invention, the present invention controls the operation of the feed and retreat belt and the tensioning belt through the same cam with opposite eccentric settings, so that when the belt is retreating, the tensioning wheel group does not interfere with the belt retreating action, and when the tensioning wheel group is working, the feed and retreat belt wheel group does not interfere with the tensioning action. It can better apply the same power to drive the belt retreating mechanism and the tensioning mechanism, with strong action coherence and synchronization and greater stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the movement of the strapping machine including the embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of another angle of the movement of the strapping machine including the embodiment of the present invention.

[0022] Figure 3Schematic diagram of an embodiment of the present invention.

[0023] Figure 4 Exploded view of the structure of an embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the connection between the second rod and the base link of the present invention.

[0025] Figure 6 Schematic diagram of the cooperation between the cam and the base link for controlling the base link in the present invention

[0026] Figure 7 Schematic diagram of the connection between the eccentric shaft and the connecting rod assembly of the present invention. Detailed implementation manner

[0027] Referring to the attached drawings. The tape feeding and retracting and tensioning mechanism provided by the present invention includes a tape feeding and retracting driving wheel 101 and a tape feeding and retracting driven wheel 102, a tensioning belt driving wheel 201 and a tensioning belt driven wheel 202. The tape feeding and retracting driven wheel 102 is connected to a first eccentric shaft 110, and the tensioning belt driven wheel 202 is connected to a second eccentric shaft 210.

[0028] The tape feeding and retracting and tensioning mechanism further includes a base link 1 and a tape feeding and retracting and tensioning total control cam 2. The base link 1 is rotatably mounted on a frame 300 of the packing machine core, and the reference numeral 10 in the attached drawing is its rotation axis. In the height direction, the base link 1 is arranged below the tape feeding and retracting driven wheel 102 and the tensioning belt driven wheel 202, and the tape feeding and retracting and tensioning total control cam 2 is arranged below the base link 1, mounted on the main shaft 400 of the core, and driven to rotate by a main shaft motor 401. The cam 2 corresponds to the base link 1 and contacts a roller 11 on the base link 1. The cam 2 is provided with a tape feeding cam surface 21, a tape retracting cam surface 22 and a tensioning belt cam surface 23 along its circumference. Among them, the tensioning belt cam surface 23 is a convex point, the tape retracting cam surface 22 is a concave area, and the diameter of the tape feeding cam surface 21 is between the convex point 23 and the concave area 22.

[0029] The tape feeding and retracting link assembly in the tape feeding and retracting and tensioning mechanism includes a first rod 31 and a second partial rod. The first end of the first rod 31 is connected to the first eccentric shaft 110, the upper end of the second partial rod is movably connected to the first rod, and the lower end of the second partial rod is movably connected to the base link 1. The tape feeding and retracting link assembly includes a third rod 41 and a fourth rod 42. The first end of the third rod 41 is connected to the second eccentric shaft 210, and the lower end of the fourth rod 42 is movably connected to the base link 1.

[0030] The eccentric connection between the belt feeding and retracting driven pulley 102 and the first eccentric shaft 110 is in the opposite direction to the eccentric connection between the belt tensioning driven pulley 210 and the second eccentric shaft 210. When changing from the belt feeding state to the belt retracting state, the belt feeding and retracting driven pulley 102 approaches the belt feeding and retracting driving pulley 101 as the first eccentric shaft 110 rotates in the first direction. When changing from the belt retracting state to the belt tensioning state, the belt tensioning driven pulley 202 approaches the belt tensioning driving pulley 201 as the second eccentric shaft 210 rotates in the second direction. The first direction and the second direction are respectively one of the clockwise direction and the counterclockwise direction and the other one of them.

[0031] The belt feeding and retracting and tensioning mechanism is provided with elastic members for driving the belt feeding and retracting link assembly, including a first elastic member 51 and a second elastic member 52.

[0032] The parts of the base link 1 connected to the belt feeding and retracting link assembly and the parts connected to the belt tensioning link assembly are arranged on the first side relative to the cam 2, and the rotating shaft 10 of the base link 1 is arranged on the second side relative to the cam 2; the base link is connected to the second elastic member 52, and the working direction of the second elastic member 52 is to make the first side of the base link 1 rotate downward. The second elastic member 52 is a tension spring, the upper end of which is connected to the base link 1 and the lower end is connected to the movement frame 300. When entering the belt tensioning state, the first side of the base link 1 is driven to rotate upward by the belt tensioning cam surface 23.

[0033] In the belt feeding and retracting link assembly, the first end of the first rod 31 is connected to the first eccentric shaft 110, and the second end is located above the base link; the belt feeding and retracting and tensioning mechanism is provided with a first elastic member 51, and the first elastic member 51 is connected between the first rod 31 and the movement frame 300. The first elastic member 51 pulls the second end of the first rod 31 downward. When changing from the belt tensioning state to the next cycle of belt feeding state, the cam rotates from the belt tensioning cam surface 23 to the belt feeding cam surface 21 and contacts the roller 11. Driven by the elastic member, the first side of the base link 1 rotates downward by a certain angle. The first elastic member 51 makes the first rod 31 drive the first eccentric shaft 110 to rotate in the first direction, so that the belt feeding and retracting driven pulley 102 approaches the belt feeding and retracting driving pulley 101, providing belt feeding pressure for the packing belt passing between the belt feeding and retracting driving pulley 101 and the belt feeding and retracting driven pulley 102. Depending on the pulling force of the first elastic member 51, the state that the belt feeding and retracting wheels gently press on the belt feeding and retracting driving pulley during belt feeding is controlled to complete belt feeding (the cam is in place).

[0034] The upper end of the second part of the rod is movably connected to the first rod, and the lower end is movably connected to the base link; the base link 1 is connected to the second elastic member 52, and the working direction of the second elastic member 52 is to make the first side of the base link rotate downward, so that when changing from the tape feeding state to the tape retracting state, the first side of the base link is driven to rotate downward. In the tape retracting state, a tape retracting pressure is provided to the packing tape passing between the tape feeding and retracting driving wheel and the tape feeding and retracting driven wheel through the base link, the tape feeding and retracting link assembly, and the first eccentric shaft.

[0035] The second part of the rod is a rod provided with an elastic member, including a second upper rod 321 and a second lower rod 322. The second lower rod 322 is rotatably connected to the base link 1 through a shaft 12. A fourth elastic member 54 is connected between the second upper rod 321 and the second lower rod 322. A limit connection structure is provided between the second upper rod 321 and the second lower rod 322. When the first side of the base link 1 rotates upward to enter the tape tensioning state, the tape feeding and retracting link assembly is driven to move by the cooperation of the limit connection structure, so that the first eccentric shaft 110 rotates in the second direction, and the cooperation state of the tape feeding and retracting driving wheel 101 and the tape feeding and retracting driven wheel 102 when exiting the tape retracting state is changed.

[0036] Specifically, in this embodiment, the upper end of the fourth elastic member 54 is connected to the second upper rod 321, and the lower end is connected to the second lower rod 322. When changing from the tape feeding state to the tape retracting state, the cam 2 rotates from the tape feeding cam surface 21 to the tape retracting cam surface 22 and contacts the roller 11. Driven by the second elastic member 52, the first side of the base link 1 rotates downward by a certain angle. The second lower rod 322 drives the second upper rod 321 by stretching the fourth elastic member 54, and then drives the first rod 31 through the connection structure between the second upper rod 321 and the first rod 31, and drives the first eccentric shaft 110 to rotate in the first direction, so that the tape feeding and retracting driven wheel 102 further approaches the tape feeding and retracting driving wheel 101, increasing the pressure on the packing tape passing between the tape feeding and retracting driving wheel 101 and the tape feeding and retracting driven wheel 102, and making the tape retracting friction force greater than the tape feeding friction force.

[0037] When the first side of the base link 1 rotates downward, through the connection between the base link and the tape tensioning link assembly, the tape tensioning link assembly rotates downward, driving the second eccentric shaft 110 to rotate in the first direction, and the tape tensioning driven wheel 202 leaves the tape tensioning driving wheel 201, disengaging from the tape tensioning state.

[0038] When transitioning from the tape-rewinding working state to the tape-tightening working state, the first side of the base link 1 is driven by the cam 2 to rotate upward, and the second eccentric shaft 210 is driven to rotate in the second direction through the tape-tightening link assembly. A third elastic member 53 is also provided between the third link 41 and the base link 1. The base link 1 drives the tape-tightening link assembly to move through the third elastic member 53, and the third link 41 drives the second eccentric shaft 210 to rotate in the second direction, causing the tape-tightening driven wheel 202 to approach the tape-tightening driving wheel 201, and applying a strong pressure for tape-tightening to the packing tape passing between the tape-tightening driving wheel 201 and the tape-tightening driven wheel 202.

[0039] The third link 41 is a downwardly curved link and is connected with a connecting member 43 at its lower part. The upper part of the fourth link 42 is connected with the connecting member 43. The base link 1 is slidably connected with the lower part of the fourth link 42. A regulating nut 44 is threadedly connected below the fourth link 42 (which can use a bolt). The third elastic member 53 is sleeved outside the fourth link 42 and is located between the base link 1 and the connecting member 43. It can also be that the threaded section of the fourth link 42 is arranged at the upper end, and the regulating nut 44 is connected above. The base link 1 pulls down the fourth link 42 by cooperating with the bolt head of the fourth link, and pulls down the connecting member 43 through the nut 44.

[0040] During this process, through the movable connection between the base link 1 and the second lower link 322, the tape-feeding and rewinding link assembly is driven to move, driving the first eccentric shaft 110 to rotate in the second direction. The limiting connection structure can adopt the limiting step 38 provided on the second lower link. When the first side of the base link 1 rotates upward to enter the tape-tightening working state, the lower end of the second upper link 321 is pushed by the limiting step 38, driving the tape-feeding and rewinding link assembly to move and causing the first eccentric shaft 110 to rotate in the second direction to exit the tape-rewinding working state.

[0041] A movement guiding structure can also be provided between the second upper link 321 and the second lower link 322. A connecting long hole 33 is provided at the lower end of the second upper link 321, and a pin 37 passing through the connecting long hole 33 is provided on the second lower link 322. When needed, by setting a suitable length or end position, the cooperation between the connecting long hole 33 and the pin 37 of the guiding structure can also play the role of the above-mentioned limiting connection structure.

[0042] Furthermore, the elastic force of each elastic component in the present invention is adjustable. By adjusting the nut 44, the force value of the third elastic component 53 can be adjusted. The lower end of the first elastic component 51 is connected to an adjusting component 61 fixed on the movement frame 300. The adjusting component 61 can be an adjusting screw rod arranged vertically, which is fixed on the adjusting bracket 301 in the movement frame 300, and its height is adjusted by a nut to adjust the force value of the first elastic component 51 and the feeding belt friction force. The upper end of the fourth elastic component 54 is connected to an adjusting component 62 fixed on the second upper rod 321. A plurality of connection holes 34 are arranged along the height direction on the second upper rod 321 for the adjusting component 62 to select the connection.

[0043] A flat shaft section 111 is provided at the part where the first eccentric shaft 110 is connected to the first end of the first rod. The flat shaft section 111 is arranged near the tail end of the first eccentric shaft 110. A long hole 35 is provided at the end of the first end of the first rod. The first eccentric shaft 110 is connected to the first rod 31 through the flat shaft section 111 and the long hole 35. In this way, by utilizing the position characteristics of the eccentric shaft and the connecting rod, a simple and easy-to-install structure is provided for the eccentric connection control of the tape feeding and retracting mechanism. The connection between the eccentric shaft and the connecting rod will not loosen, enabling the tape feeding and retracting mechanism to provide a more stable tape feeding and retracting force for tape retraction.

[0044] A screw rod 112 is provided at the tail end of the first eccentric shaft 110 immediately following the flat shaft section. The screw rod 112 passes through the long hole 35 and is connected to a nut 71. The flat shaft section 111 is provided with parallel upper and lower planes. The hole wall of the long hole 35 is provided with parallel straight hole walls that cooperate with the upper and lower planes, forming a more stable limit fit and a more stable force transmission efficiency.

[0045] A connection hole 36 is provided at the upper end of the second upper rod 321. The second end of the first rod 31 passes through the connection hole 36, and the connection hole 36 is preferably an elongated hole. The second upper rod 321 is connected to the first rod 31 through the connection hole 36. The first rod 31 is connected to the first elastic component 51 at the second end. Through this connection structure, it can withstand frequent repeated actions and vibrations, and keep the tape retraction action always accurate and reliable.

[0046] A flat shaft section 211 is provided at the part where the second eccentric shaft 210 is connected to the first end of the third rod. The flat shaft section 211 is arranged near the tail end of the second eccentric shaft 210. A long hole 45 is provided at the end of the first end of the third rod. The second eccentric shaft 210 is connected to the third rod 41 through the flat shaft section 211 and the long hole 45. In this way, by utilizing the position characteristics of the eccentric shaft and the connecting rod, a simple and easy-to-install structure is provided for the eccentric connection control of the tape tensioning mechanism. The connection between the eccentric shaft and the connecting rod will not loosen, enabling the tape tensioning mechanism to provide a more effective tape tensioning force for tape tensioning.

[0047] A screw 212 is provided at the tail end of the second eccentric shaft 210 immediately adjacent to the flat shaft section, and the screw 212 passes through the long hole 45 and is connected to a nut 72. The flat shaft section 211 is provided with parallel upper and lower planes, and the hole wall of the long hole 45 is provided with parallel straight hole walls that cooperate with the upper and lower planes, forming a more stable limiting fit and a more stable force transmission efficiency.

[0048] In the present invention, the tensioning wheel driving wheel 201 and the tape feeding and retracting driving wheel 101 are driven by the same motor 500. Applying the above structure of the present invention can make the tape retracting mechanism and the tensioning mechanism act coherently and synchronously with strong stability when driven by the same power, thereby streamlining the structure as a whole while ensuring the working quality.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "one end", "the other end", "outer side", "inner side", "horizontal", "end portion", "length", "outer end", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0050] The above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

Claims

1. A tape feeding and retracting and tensioning mechanism, comprising a tape feeding and retracting driving wheel, a tape feeding and retracting driven wheel, a tensioning driving wheel and a tensioning driven wheel, wherein the tape feeding and retracting driven wheel is connected to a first eccentric shaft, and the tensioning driven wheel is connected to a second eccentric shaft; characterized in that, The tape feeding and retracting tensioning mechanism includes: A rotatable base link and a tape feeding and retracting tensioning master control cam located below. The cam corresponds to the base link, and a tape feeding cam surface, a tape retracting cam surface, and a tensioning tape cam surface are arranged along its circumferential direction; A tape feeding and retracting link assembly, one end of the tape feeding and retracting link assembly is connected to a first eccentric shaft, and the other end is connected to the base link; A tensioning tape link assembly, one end of the tensioning tape link assembly is connected to a second eccentric shaft, and the other end is connected to the base link; The eccentric direction of the first eccentric shaft relative to the tape feeding and retracting driven wheel is opposite to the eccentric direction of the second eccentric shaft relative to the tensioning tape driven wheel, so that when the tape feeding and retracting driven wheel approaches the tape feeding and retracting driving wheel, the first eccentric shaft rotates in a first direction, and when the tensioning tape driven wheel approaches the tensioning tape driving wheel, the second eccentric shaft rotates in a second direction. The first direction and the second direction are respectively one of the clockwise direction and the counterclockwise direction and the other of them; The parts of the base link connected to the tape feeding and retracting link assembly and the parts connected to the tensioning tape link assembly are arranged on a first side relative to the cam, and the rotating shaft of the base link is arranged on a second side relative to the cam; when entering the tensioning tape working state, the tensioning tape cam surface drives the first side of the base link to rotate upward; The tape feeding and retracting link assembly is composed of a first rod and a second partial rod. The first end of the first rod is connected to the first eccentric shaft, and the second end is above the base link; the tape feeding and retracting tensioning mechanism is provided with a first elastic member, the first elastic member is connected to the first rod, and the working direction of the first elastic member is that when entering the tape feeding working state, the first rod drives the first eccentric shaft to rotate in the first direction, and provides a tape feeding pressure for the packing tape passing between the tape feeding and retracting driving wheel and the tape feeding and retracting driven wheel through the first eccentric shaft; The upper end of the second partial rod is movably connected to the first rod, and the lower end is movably connected to the base link; the base link is connected with a second elastic member, and the working direction of the second elastic member is to make the first side of the base link rotate downward, so that when changing from the tape feeding to the tape retracting working state, it drives the first side of the base link to rotate downward, and when in the tape retracting working state, it provides a tape retracting pressure for the packing tape passing between the tape feeding and retracting driving wheel and the tape feeding and retracting driven wheel through the base link, the tape feeding and retracting link assembly and the first eccentric shaft; The tensioning tape link assembly includes a third rod connected to the second eccentric shaft and a fourth rod movably connected to the base link. A third elastic member is further arranged between the third rod and the base link. When entering the tensioning tape working state, the cam drives the first side of the base link to rotate upward, the base link drives the tensioning tape link assembly to move through the third elastic member, and the tensioning tape link assembly drives the second eccentric shaft to rotate in the second direction, providing a tensioning tape pressure for the packing tape passing between the tensioning tape driving wheel and the tensioning tape driven wheel; The second elastic member is a tension spring.

2. The tape feeding and retracting and tensioning mechanism according to claim 1, characterized in that The second part of the rod is a rod provided with an elastic member, including an upper second rod and a lower second rod. The lower second rod is rotatably connected to the base link. A fourth elastic member is connected between the upper second rod and the lower second rod. A limit connection structure is provided between the upper second rod and the lower second rod. When the base link rotates upward on the first side to enter the working state of the tensioning belt, driven by the cooperation of the limit connection structure, the feed and retreat belt link assembly moves, causing the first eccentric shaft to rotate in the second direction, so that the feed and retreat belt driving wheel and the feed and retreat belt driven wheel are disengaged from the cooperation in the belt retreating working state.

3. The tape feeding and retracting and tensioning mechanism according to claim 1, characterized in that The third rod is a downwardly bent link and is connected with a connecting member at its lower part. The upper part of the fourth rod is connected with the connecting member. The base link is slidably connected with the lower part of the fourth rod. The fourth rod is threadedly connected with an adjusting nut. The third elastic member is sleeved outside the fourth rod and is located between the base link and the connecting member.

4. The tape feeding and retracting and tensioning mechanism according to claim 1, wherein The lower end of the first elastic member is connected with an adjusting member fixed on the movement frame.

5. The tape feeding and retracting and tensioning mechanism according to claim 2, wherein The upper end of the fourth elastic member is connected with an adjusting member fixed on the upper second rod.

6. The tape feeding and retracting and tensioning mechanism according to claim 1, wherein A flat shaft section is provided at the part where the first eccentric shaft is connected with the feed and retreat belt link assembly. A long hole is provided at the end of the feed and retreat belt link assembly. The flat shaft section is inserted into the long hole to form a limit fit. A flat shaft section is provided at the part where the second eccentric shaft is connected with the tensioning belt link assembly. A long hole is provided at the end of the tensioning belt link assembly. The flat shaft section is inserted into the long hole to form a limit fit.

7. The tape feeding and retracting and tensioning mechanism according to claim 2, characterized in that A connection hole is provided at the upper end of the upper second rod. The second end of the first rod passes through the connection hole. The upper second rod is connected with the first rod through the connection hole. The first elastic member is connected to the second end of the first rod.

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