Strapping Machine

Abstract

The present invention discloses a strapping machine, comprising: a middle frame, a bow frame, and a belt clamping mechanism, characterized in that the belt clamping mechanism includes a support plate, and a clamping plate that can rotate relative to the support plate, the rotation center of the clamping plate is located at the rear of the clamping plate, and a force-applying component continuously applies force to the clamping plate so that the front part of the clamping plate has a movement tendency to rotate toward the support plate, and a guide rail is provided at the front end of the middle frame. During the binding action of the strapping machine, the guide rail overcomes the force of the force-applying component and applies force to the clamping plate to drive it to rotate, so that the front part of the clamping plate rotates away from the support plate, and the point of action of the reaction force applied to the guide rail moves on the guide rail.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural production bundling tools, in particular to a bundling machine. Background Art

[0002] When planting crops such as tomatoes, grapes, and kiwis, we usually need to fix the vines or branches of the plants on bamboo racks or wires to guide their growth or assist in fruiting, thereby increasing crop yield and quality.

[0003] The traditional solution is to use ropes or cloth strips to tie them one by one. This method is inefficient and easily damages the plants, and cannot meet the needs of large-scale planting and production. Currently, tying machines (also called branch tying machines) are commonly used to tie and fix the plants.

[0004] For example, the Chinese utility model patent with the authorization announcement number CN21121728U discloses a branch binding machine, which mainly includes a binding band clamping device, a bow frame, a handle, a frame, a needle box, and a binding band box. It is characterized in that the binding band clamping device comprises a machine box, a positioning plate, a band pressing needle, and a forming anvil; the positioning plate is hinged in the machine box cavity, and a spring is provided on the positioning plate to make it have a tendency to rotate in the counterclockwise direction; the band pressing needle is hinged in the machine box cavity, and a torsion spring is also provided on the band pressing needle to make it have a tendency to rotate in the counterclockwise direction; the positioning plate matches the band pressing needle; and a collision block is also provided on the frame, and the collision block matches the band pressing needle. Its advantages are: simple structure, high degree of automation, labor-saving and light, the blade is not easy to be damaged and is firmly fixed and easy to replace, and it can avoid damaging the crop branches during the branch binding operation.

[0005] The disadvantage is that the structure of the clamping mechanism is relatively complex, and the driving force required for binding is relatively large, the operation feels heavy, and it is easy to get tired after long-term use.

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a strapping machine which has the characteristics of simple structure, ingenious layout, light hand feel, etc. Summary of the invention

[0007] In order to achieve the above object, the present invention discloses a strapping machine, which has the following characteristics:

[0008] (1) The strapping machine comprises: a middle frame capable of pulling out a strap from a front end portion; a bow frame installed to be rotatable relative to the middle frame; a strap clamping mechanism installed at the front end portion of the bow frame; a binding mechanism including a needle groove rotatably installed on the middle frame, a needle mold installed at the front end portion of the bow frame, and a pin plate fixed at the front end portion of the middle frame and matching the needle groove and the needle mold; a cutter installed at the front end portion of the middle frame and arranged parallel to the pin plate; during the process of the bow frame rotating from an open position relative to the middle frame in a closed direction to a predetermined position and then returning to the open position, a clamping action of clamping the end portion of the strap pulled out from the front end portion of the middle frame by the strap clamping mechanism is performed, and after the bow frame completes the clamping action any one time, it rotates from the open position relative to the middle frame in a closed direction to a closed position. During the process of the strapping machine performing the binding action, the binding mechanism binds the combined parts of the strap and the cutter cuts the strap, and the bundled object can be bundled by alternately performing the clamping action and the binding action; the strap clamping mechanism includes a support plate and a clamping plate rotatable relative to the support plate, the rotation center of the clamping plate is located at its rear part, and a force-applying component continuously applies force to the clamping plate so that the front part of the clamping plate has a movement tendency to rotate toward the support plate; a guide rail is provided at the front end part of the middle frame, and during the process of the strapping machine performing the binding action, the guide rail overcomes the force of the force-applying component and applies force to the clamping plate to drive it to rotate, so that the front part of the clamping plate rotates away from the support plate, and the point of action of the reaction force applied to the guide rail moves on the guide rail.

[0009] (2) In addition to the features described in (1) above, the strapping machine is further characterized in that a collision block is provided on the clamping plate, the collision block matches the guide rail, and during the process of the bow frame rotating from the predetermined position relative to the middle frame to the closed position, the collision block is subjected to force in a moving manner on the guide rail.

[0010] (3) In addition to the features described in (2) above, the strapping machine is further characterized in that the belt clamping mechanism further includes a rotatable non-return pawl, and a ratchet corresponding to the non-return pawl is provided at the rear of the clamping plate. When the non-return pawl and the ratchet enter into a meshing state, the non-return pawl overcomes the force applied by the force-applying component to the rear of the clamping plate, so that the front of the clamping plate remains separated from the support plate. When the non-return pawl and the ratchet exit the meshing state, the front of the clamping plate rotates and is pressed onto the support plate under the action of the force-applying component.

[0011] (4) In addition to the features described in (3) above, the strapping machine is further characterized in that the front end portion of the middle frame has a trigger member, and when the strapping machine is performing the clamping action, when the bow frame rotates from an open position to a predetermined position in a closed direction relative to the middle frame, the trigger member applies force to the non-return pawl, causing the non-return pawl to rotate and exit the meshing state with the ratchet.

[0012] (5) In addition to the feature described in (4) above, the strapping machine is further characterized in that the trigger member is composed of a metal spring.

[0013] (6) In addition to the features described in any one of (1) to (5) above, the strapping machine is further characterized in that the direction formed by the guide rail and the direction formed by the middle frame intersect at a certain angle.

[0014] (7) In addition to the features described in any one of (2) to (5) above, the strapping machine is further characterized in that, when the middle frame is in a horizontal position, during the binding operation, the impact block moves from a high position to a low position on the guide rail.

[0015] After adopting the above structure, the present invention has the following advantages compared with the prior art:

[0016] It has the characteristics of simple structure, ingenious layout and light operation feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a front view of the strapping machine, showing the bow frame in the open position.

[0019] Figure 2 This is a front view of the strapping machine, showing the bow frame in the closed position.

[0020] Figure 3 This is an enlarged cross-sectional view of the vicinity of the front end of the strapping machine.

[0021] Figure 4 It is an enlarged partial cross-sectional view of the vicinity of the front end of the strapping machine, showing the bow frame in a predetermined position.

[0022] Figure 5 It is a schematic diagram of the structure of the belt clamping mechanism, which is a diagram of the state in which the belt clamping plate is opened relative to the support plate.

[0023] Figure 6 It is a schematic diagram of the structure of the belt clamping mechanism, which is a diagram of the state in which the clamping plate and the support plate are engaged.

[0024] Figure 7 A perspective view of the support plate.

[0025] Figure 8 It is a three-dimensional diagram of the clamping plate.

[0026] Fig. 9 It is a three-dimensional diagram of the non-return pawl.

[0027] Fig.10 It is a three-dimensional diagram of the transmission crank.

[0028] Fig.11 It is a three-dimensional diagram of the trigger.

[0029] Fig.12 It is a three-dimensional diagram of the resistance member.

[0030] Fig.13 It is a three-dimensional diagram of the needle groove. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] However, the strapping machine provided by the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing the embodiments is to make the disclosure of the strapping machine more thorough and comprehensive.

[0033] like Figure 1 As shown, a strapping machine provided in one embodiment of the present invention comprises a middle frame 1 with a straight "U"-shaped cross section, a bow frame 2 with an arc-shaped rear end hinged on the middle frame 1, a belt clamping mechanism 3 arranged at the front end of the bow frame 2, and an operating handle 4 hinged to the bow frame 2 in an "x" shape.

[0034] A horizontal axis 11 is provided in the middle of the middle frame 1, and a hook 41 is provided at the front end of the operating handle 4 to be hung on the horizontal axis 11. A spring (omitted in the figure) is provided between the middle frame 1 and the bow frame 2 to continuously apply force, so that the front parts of the middle frame 1 and the bow frame 2 have a movement tendency to separate from each other. In this way, when there is no external force, the bow frame 2 is kept relative to the middle frame 1. Figure 1 Shown in open position.

[0035] When force is applied by squeezing the operating handle 4 and the rear of the middle frame 1, the bow frame 2 rotates clockwise relative to the middle frame 1, and the front parts thereof move closer to each other until they can no longer rotate and reach the position as shown in FIG. Figure 2 Shown in closed position. Figures 1 to 6, the clamping mechanism 3 is installed at the front of the bow frame 2, including a support plate 31 installed in a fixed manner, a clamping plate 32 installed in a rotatable manner corresponding to the support plate 31. A torsion spring 321 (force-applying component) is provided on one side of the clamping plate 32 to apply a force to it, so that the front end of the clamping plate 32 has a tendency to rotate towards the support plate 31. There is a striker 322 on the clamping plate 32, and a ratchet tooth 323 is provided at the rear of the clamping plate 32. The front end of a rotatable check ratchet 33 matches the ratchet tooth 323; when the check ratchet 33 is in the engaged state with the ratchet tooth 323, as Figure 5 shown, the check ratchet 33 overcomes the acting force of the torsion spring 321 (force-applying component), so that the front end of the clamping plate 32 remains in a separated state from the support plate 31. When the check ratchet 33 rotates a certain angle in the clockwise direction from the state shown in Figure 4 , the check ratchet 33 disengages from the ratchet tooth 322, and the front end of the clamping plate 32 rotates and presses onto the support plate 31 under the acting force of the torsion spring 321 (force-applying component).

[0036] Preferably, a compression spring 331 applies a force to the rear end of the check ratchet 33, so that its front end has a tendency to rotate towards the clamping plate 32.

[0037] Combined with Figure 1 、 4 、5、9、1, there is also a firing pin 332 at the rear of the check ratchet 33. The rear part of a transmission crank 34 matches the firing pin 332 ( Figure 4 、 5 ), the transmission crank 34 is installed in a rotatable manner, and its front end (lower end) corresponds to a trigger 12 made of an elastic metal sheet and formed in a curved shape and installed at the front end of the middle frame 1 ( Figure 1 ). The rear end of the transmission crank 34 is in a "匚" shape ( Figure 4 、 5 ), and is connected to the firing pin 332 in a semi-linkage manner: when the transmission crank 34 rotates in the counterclockwise direction, it has no acting force on the firing pin 332. When the transmission crank 34 rotates in the clockwise direction, the rear end of the transmission crank 34 applies a force to the firing pin 332 to drive the check ratchet 33 to rotate in the clockwise direction.

[0038] Combined with Figure 1 、 3 、4、13 The binding mechanism includes a needle slot 5 with a linear shape formed for storing binding needles and coaxially hinged to the middle frame 1 at the rear of the bow frame 2. The needle slot 5 is located in the "U" - shaped slot of the middle frame 1. A spring (view omitted) is provided between the lower part of the needle slot 5 and the middle frame 1 to keep a certain angle between the needle slot 5 and the front end of the middle frame 1. In this way, the distance between the lower bottom surface of the front end of the needle slot 5 and the middle frame 1 is greater than the distance between the lower bottom surface of the rear end of the needle slot 5 and the middle frame 1.

[0039] As Figure 4 As shown, a needle outlet 51 is provided at the front end of the needle slot 5, a ejector plate 52 is provided at a position corresponding to the needle outlet 51 on the middle frame 1, and a needle mold 53 is provided at a position adjacent to the support plate 31 at the front end of the bow frame 2. The position of the needle mold 53 corresponds to the positions of the needle outlet 51 and the ejector plate 52. The ejector plate 52 can eject the binding needle installed in the needle slot 5 from the needle outlet 51 and press it onto the needle mold 53 to complete the binding (the principle is the same as the working principle of a common stapler).

[0040] like Figure 3 As shown, at the front end of the middle frame 1, a cutter 13 is provided in front of the ejector plate 52, and the cutter 13 is arranged parallel to the ejector plate 52. A belt outlet 14 is provided in front of the cutter 13, and the guide direction is parallel to the ejector plate 52. The end of the strap used for bundling can be pulled upward from the bottom of the middle frame 1 through the belt outlet 14. The position of the belt outlet 14 corresponds to the clamping plate 32 and the support plate 31. When the front end of the clamping plate 32 is kept separated from the support plate 31, when the front end of the bow frame 2 is rotated to be close to the front end of the middle frame 1, the end of the belt guided out by the belt outlet 14 is sent into the opening formed by the front end of the clamping plate 32 and the support plate 31 as the bow frame 2 and the middle frame 1 approach each other.

[0041] Combination Figure 1 , 13 A resistance member 15 is also provided at the front end of the middle frame 1. The resistance member 15 is fixed to the front part of the middle frame 1. A guide rail 151 is provided at the front end of the resistance member 15, corresponding to the collision block 322 on the clamping plate 32. When the middle frame 1 is in a horizontal position, the left side of the guide rail 322 is higher than the right side, that is, the direction formed by the guide rail 322 intersects with the direction formed by the middle frame 1 to form a certain angle.

[0042] Figure 1 This is the initial state of the strapping machine, the bow frame 2 is in the open position, the front end of the clamping plate 32 is separated from the support plate 31, and the state corresponding to the clamping mechanism 3 is as follows Figure 5 As shown, the non-return pawl 33 is in meshing state with the ratchet teeth 322 at the rear of the clamping plate 32 .

[0043] In by Figure 1 In the initial state shown, by squeezing the operating handle 4, the bow frame 2 starts to rotate clockwise from the open position relative to the middle frame 1, and the front end of the bow frame 2 moves closer to the front end of the middle frame 1. Figures 1 to 4, since the positions of the needle mold 53 and the needle outlet 51 correspond, when the needle mold 53 moves to just contact with the needle outlet 51 (there is no interaction force between the needle mold 53 and the needle outlet 51, that is, between the needle mold 53 and the needle slot 5), the front end (lower end) of the transmission crank 34 and the trigger member 12 composed of the metal spring sheet are initially in contact and interact with each other. Under the action of the trigger member 12, the transmission crank 34 drives the non-return pawl 33 to rotate a certain angle in the clockwise direction, and the front end of the non-return pawl 33 and the ratchet 323 on the clamping plate 32 exit the meshing state, so under the action of the torsion spring 321 (force-applying component), the clamping plate 32 is clamped. The front end of the plate 32 rotates toward the support plate 31 and is pressed onto the support plate 31, that is, the clamping plate 32 and the support plate 31 enter into an engaged state, so that the end of the belt guided out from the belt outlet 14 at the front end of the middle frame 1 is pressed onto the support plate 31 by the front end of the clamping plate 32, that is, the belt clamping mechanism 3 clamps the end of the belt; then the operating handle 4 is released, and the bow frame 2 begins to rotate in a clockwise direction relative to the middle frame 2 until it returns to the open position, so that the clamping plate 32 and the support plate 31 that are engaged with each other pull a section of the belt out of the belt outlet 14, thereby forming a section of belt for bundling at the front end of the bow frame 2 and the middle frame 1 in the open state.

[0044] The above-mentioned process of squeezing the operating handle 4 to rotate the bow frame 2 relative to the middle frame 1 from the open position (initial position) to a certain angle makes the clamping plate 32 and the support plate 31 clamp the end of the belt guided out from the belt outlet 14, and then releasing the operating handle 4 to return the bow frame 2 to the open position (initial position) to form a section of belt for bundling at the front end of the bow frame 2 and the middle frame 1 is the aforementioned clamping action.

[0045] It should be noted that, in the process of executing the clamping action, the bow frame 2 rotates from the open position until the needle mold 53 just contacts the needle outlet 51. At the same time, the front end (lower end) of the transmission crank 34 initially contacts and interacts with the trigger member 12, but no interaction force is generated between the needle mold 53 and the needle outlet 51, and the bow frame 2 has not reached the closed position. At this time, the position of the bow frame 2 is the aforementioned predetermined position.

[0046] After completing the clamping action, the bundled object is pressed against the strapping belt between the bow frame 2 and the front end of the middle frame 1 in a direction perpendicular to the rotation plane of the bow frame 2, and guided into the arc of the bow frame 2. Then, the operating handle 4 is squeezed again to make the bow frame 2 start to rotate from the open position, so that the strapping belt bypasses the bundled object and gradually surrounds the bundled object until the bow frame 2 reaches the closed position, and the joint part of the belt is pressed by the needle mold 53 to the needle outlet 51 at the front end of the needle groove 5.

[0047] The process of operating the bow frame 2 to rotate from the open position to the closed position after completing the clamping action can actually be divided into two stages: in the first stage, the bow frame 2 rotates from the open position to the predetermined position, at which time the needle mold 53 just contacts the needle outlet 51, and at the same time the transmission crank 34 interacts with the trigger member 12. Since the non-return pawl 33 and the ratchet 323 on the clamping plate 32 have exited the meshing state, the state of the clamping plate 32 will not change during this process.

[0048] Then comes the second stage. After the bow frame 2 reaches the predetermined position, it continues to rotate in the clockwise direction, and the needle mold 53 begins to apply force to the needle outlet 51 (i.e., the front part of the needle groove 5). The needle groove 5 begins to rotate with the rotation of the bow frame 2, and the ejector plate 52 fixed on the middle frame 1 enters the needle outlet 51, and squeezes the binding needle pre-installed in the needle groove 5 toward the needle mold 53. Since the joint part of the belt is pressed on the needle outlet 51 by the needle mold 53, the binding needle pushed upward by the ejector plate 52 binds the joint part of the belt together under the action of the needle mold 53 (the binding process is similar to the binding action of a common stapler). At the same time, due to the action of the cutter 13, the belt led out from the belt outlet 14 is cut off as the needle mold 53 presses down, and then the operating handle 4 is released, and the bow frame 2 returns to the open position again. In this way, one bundling is completed.

[0049] The above-mentioned binding action is the process of the bow frame 2 completing a clamping action, and then guiding the bundled object against the belt into the arc of the bow frame 2, and then squeezing the operating handle 4 to rotate the bow frame 2 from the open position to the closed position to bind and cut the combined parts of the belt.

[0050] Preferably, the positions at which the front ends of the trigger member 12 and the front ends of the transmission crank 34 correspond to each other are formed in a curve. When performing the binding action, during the process of the bow frame 2 rotating from the predetermined position to the closed position, the interaction force between the front ends of the transmission crank 34 and the trigger member 12 gradually increases, and finally the front end of the trigger member 12 made of metal spring sheet is deflected in a clockwise direction. In this way, the lower end of the transmission crank 34 moves to the lower left side of the trigger member 12, and the interaction force between the transmission crank 34 and the trigger member 12 disappears.

[0051] In addition, when the binding action is performed, in the process of the bow frame 2 rotating from the open position to the predetermined position, the clamping plate 32 and the support plate 31 are in a bite state. When the bow frame 2 rotates to the predetermined position, the collision block 322 just moves to the left side of the guide rail 151 and makes initial contact. When the bow frame 2 further rotates from the predetermined position to the closed position, the collision block 322 and the guide rail 151 interact with each other. The guide rail 151 overcomes the force of the torsion spring 321 (force-applying component) to apply force to the collision block 322, that is, the clamping plate 32, thereby driving the clamping plate 32 to rotate, so that the front part of the clamping plate 32 turns away from the support plate 31 to exit the bite state. When the bow frame 2 reaches the closed position (cannot rotate further), the collision block 322 slides to the right side of the guide rail 151. At this time, the rotation angle of the clamping plate 32 reaches the maximum, and the ratchet 323 at the rear of the clamping plate 32 enters into a meshing state with the non-return pawl 33, and the clamping plate 32 remains in a state where the front end is separated from the support plate 31.

[0052] In the above process, the collision block 322 moves from the left side to the right side of the guide rail 151, that is, while the collision block 322 interacts with the guide rail 151, the contact point between the collision block 322 and the guide rail 151 is constantly changing, that is, the point where the guide rail 151 is subjected to the force of the reaction force from the collision block 322 moves from the left side to the right side on the guide rail 151. At the same time, the angle between the line connecting the collision block 322 and the rotation center of the clamping plate 32 and the guide rail 151 is constantly decreasing, so that the force arm of the turning torque of the guide rail 151 driving the clamping plate 32 to rotate is correspondingly lengthened. When the torque required to drive the clamping plate 32 to rotate is constant, the required force becomes smaller, that is, in the process of the collision block 322 moving from the left side to the right side on the guide rail 151, the interaction force between the collision block 322 and the guide rail 151 is constantly decreasing, which makes the hand feel correspondingly lighter when operating the strapping machine.

[0053] It can be seen that when the binding action is completed and the bow frame 2 reaches the closed position, the bundling is completed, the belt is cut off, and at the same time, the front end of the clamping plate 32 is separated from the support plate 31, and the ratchet 323 at the rear of the clamping plate 32 and the non-return pawl 33 enter into a meshing state.

[0054] Then, the operating handle 4 is released again, and the bow frame 2 starts to rotate from the closed position to the open position. The front end (lower end) of the transmission crank 34 applies an upward force to the trigger 12 from the lower left side thereof, and the reaction force causes the transmission crank 34 to have a tendency to rotate counterclockwise. Since the upper end of the transmission crank 34 is in a "C" shape and is connected to the firing pin 332 in a semi-linkage manner, the firing pin 332 is not affected by the transmission crank 34 at this time. Under the action of the front end (lower end) of the transmission crank 34, the trigger 12 deforms upward to the right to avoid the movement of the front end (lower end) of the transmission crank 34 to the upper left side until the transmission crank 34 is separated from the trigger 12. The bow frame 2 further rotates and returns to the open position. In this way, the bundling machine returns to the initial state, and the next bundling can be performed by alternately executing the clamping action and the binding action again.

[0055] The above are only the preferred embodiments of the present invention, and do not limit the scope of this patent. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A strapping machine comprising: a middle frame capable of pulling out a strap from a front end portion; a bow frame installed to be rotatable relative to the middle frame; a strap clamping mechanism installed at the front end portion of the bow frame; a binding mechanism comprising a needle groove rotatably installed on the middle frame, a needle mold installed at the front end portion of the bow frame, and a pin plate fixed to the front end portion of the middle frame and matching the needle groove and the needle mold; a cutter installed at the front end portion of the middle frame and arranged parallel to the pin plate; in the process of the bow frame rotating from an open position relative to the middle frame in a closed direction to a predetermined position and then returning to the open position, a clamping action of clamping the end portion of the strap pulled out from the front end portion of the middle frame by the strap clamping mechanism is performed, and after the bow frame completes the clamping action any one time, it rotates from the open position relative to the middle frame in a closed direction to a closed position During the process, the binding action of binding the combined parts of the belt by the binding mechanism and cutting the belt by the cutter is performed, and the bundled objects can be bundled by alternately performing the clamping action and the binding action. The strapping machine is characterized in that the belt clamping mechanism includes a support plate and a clamping plate that can rotate relative to the support plate, the rotation center of the clamping plate is located at the rear thereof, and a force-applying component continuously applies force to the clamping plate so that the front part of the clamping plate has a movement tendency to rotate toward the support plate. A guide rail is provided at the front end part of the middle frame. During the process of the strapping machine performing the binding action, the guide rail overcomes the force of the force-applying component and applies force to the clamping plate to drive it to rotate, so that the front part of the clamping plate rotates away from the support plate, and the point of action of the reaction force applied to the guide rail moves on the guide rail.

2. The strapping machine according to claim 1, characterized in that: The clamping plate is provided with a collision block, which matches the guide rail. During the process of the bow frame rotating from the predetermined position relative to the middle frame to the closed position, the collision block is subjected to force in a moving manner on the guide rail.

3. The strapping machine according to claim 2, characterized in that: The belt clamping mechanism also includes a rotatable non-return pawl, and a ratchet corresponding to the non-return pawl is provided at the rear of the clamping plate. When the non-return pawl and the ratchet enter into a meshing state, the non-return pawl overcomes the force applied by the force-applying component to the rear of the clamping plate, so that the front of the clamping plate remains separated from the support plate. When the non-return pawl and the ratchet exit the meshing state, the front of the clamping plate rotates and is pressed onto the support plate under the action of the force-applying component.

4. The strapping machine according to claim 3, characterized in that: The front end of the middle frame has a trigger member. During the clamping action of the strapping machine, when the bow frame rotates from an open position to a closed direction relative to the middle frame to a predetermined position, the trigger member applies force to the non-return pawl, causing the non-return pawl to rotate and exit the meshing state with the ratchet.

5. The strapping machine according to claim 4, characterized in that: The triggering member is composed of a metal spring.

6. The strapping machine according to any one of claims 1 to 5, characterized in that: The direction formed by the guide rail and the direction formed by the middle frame intersect to form a certain angle.

7. The strapping machine according to any one of claims 2 to 5, characterized in that: When the middle frame is in a horizontal position, during the binding action, the collision block moves from a high position to a low position on the guide rail.

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