Film pulling mechanism

Abstract

The utility model relates to a kind of cut film mechanism, it includes: film feeding mechanism, pull film mechanism and cutting mechanism, film feeding mechanism is equipped with several comb teeth being arranged at intervals along left and right direction, and movably be equipped in rack, film feeding mechanism is relative rack movable, to drive comb tooth forward or backward movement.Pull film mechanism is movably arranged on rack and includes fixed seat and movable seat being arranged in up and down, movable seat is equipped with several clamping portions being arranged at intervals in left and right direction, and with fixed seat movably connected, movable seat is relative fixed seat movable, to drive clamping portion and fixed seat up and down fold or separate.Cutting mechanism is installed on rack, and for executing cutting operation.Wherein, when clamping portion and fixed seat separate, and comb tooth moves forward and extends between clamping portion and fixed seat, movable seat can be movable and drive clamping portion between two adjacent comb teeth, to make clamping portion and fixed seat up and down fold.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and more specifically, to a film cutting mechanism. Background Technology

[0002] Plastic wrap is a practical packaging material, and wrapping products with plastic wrap is a way to package them. To facilitate the cutting and segmenting of rolls of plastic wrap for subsequent wrapping, existing technology discloses a plastic wrap packaging device, which includes a frame and a film feeding mechanism, a film pulling mechanism, and a film cutting mechanism mounted on the frame. The film feeding mechanism includes two opposing and rotatable pressure rollers. The film pulling mechanism has movable grippers. Specifically, the grippers of the film pulling mechanism first grasp the plastic wrap fed from between the two pressure rollers and pull it out to a certain length. The film cutting mechanism then cuts the plastic wrap between the film feeding mechanism and the film pulling mechanism. Thus, through the coordinated operation of the film feeding mechanism, the film pulling mechanism, and the film cutting mechanism, a section of plastic wrap can be cut.

[0003] However, after the plastic wrap is fed out by the two rollers, it is in a free-suspension state. During the gripping process by the claws, it may deviate or shake, which will affect the accuracy and stability of subsequent film stretching and cutting. Utility Model Content

[0004] The purpose of this invention is to provide a film-cutting mechanism, which solves the technical problem of how to ensure that the plastic wrap can be accurately and stably stretched and cut.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0006] This utility model provides a film cutting and stretching mechanism, comprising: a film feeding mechanism having a plurality of comb teeth arranged at intervals in the left-right direction and movably mounted on a frame; the film feeding mechanism being movable relative to the frame to drive the comb teeth to move forward or backward; a film stretching mechanism being movable back and forth on the frame and including a fixed seat and a movable seat arranged vertically; the movable seat including a plurality of clamping parts arranged at intervals in the left-right direction and movably connected to the fixed seat; the movable seat being movable relative to the fixed seat to drive the clamping parts to close or separate from the fixed seat vertically; and a cutting mechanism mounted on the frame and used to perform a cutting operation between the film feeding mechanism and the film stretching mechanism; wherein, when the clamping parts separate from the fixed seat and the comb teeth move forward and extend between the clamping parts and the fixed seat, the movable seat is movable and drives the clamping parts to pass between two adjacent comb teeth, and causes the clamping parts to close vertically with the fixed seat.

[0007] In some embodiments of this application, there are two film-pulling mechanisms, namely a front film-pulling mechanism and a rear film-pulling mechanism; the front film-pulling mechanism and the rear film-pulling mechanism are arranged sequentially and configured such that the clamping part of the front film-pulling mechanism and the clamping part of the rear film-pulling mechanism pass through the space between two adjacent comb teeth and close vertically with the corresponding fixing seat; the cutting mechanism is used to perform a cutting operation between the film feeding mechanism and the rear film-pulling mechanism.

[0008] In some embodiments of this application, the membrane stretching mechanism further includes a connecting seat, which is supported below the fixed seat; the clamping part includes a main body and a connecting part connected in an L-shape, the main body being used to close vertically with the fixed seat; the movable seat further includes a rotating part, which is connected to the connecting part of each clamping part and arranged opposite to each main body, the rotating part being rotatably disposed on the connecting seat, and the rotation axis of the rotating part extending horizontally in the left-right direction.

[0009] In some embodiments of this application, the film stretching mechanism further includes a rotating rod and a drive assembly. The rotating rod is rotatably connected to the connecting seat and connected to the rotating part. The drive assembly includes a cylinder and a connecting rod. The cylinder is disposed on the connecting seat, and the two ends of the connecting rod are respectively hinged to the output end of the cylinder and the rotating rod.

[0010] In some embodiments of this application, two rotating rods are arranged side by side in the front-to-back direction; a plurality of movable seats are arranged sequentially in the left-to-right direction, and some of the movable seats correspond to one of the rotating rods, while the remaining parts correspond to the other rotating rod.

[0011] In some embodiments of this application, the movable seats located on both sides in the left-right direction among the plurality of movable seats correspond to the rear rotating rod in the front-back direction among the two rotating rods, and the movable seat in the middle corresponds to the rotating rod located on the front side.

[0012] In some embodiments of this application, the film feeding mechanism includes a traction structure and two rollers; the traction structure includes a first part and a second part connected in an L-shape, the first part having the comb teeth at one end away from the second part, the second part being rotatably mounted on the frame and rotating relative to the frame to drive the comb teeth to move forward or backward; the two rollers are respectively located at one end of the second part away from the first part and at the connection between the second part and the first part, and are both located on the side of the second part facing away from the first part.

[0013] In some embodiments of this application, the film feeding mechanism further includes supports and a rotating rod. Two supports are arranged side by side at intervals in the left-right direction. The two supports are located on the left and right sides of the traction structure and are respectively connected to the frame. The rotating rod is connected to the second part, and both ends of the rotating rod are rotatably connected to the two supports, so that the second part is rotatably mounted on the frame.

[0014] In some embodiments of this application, the film feeding mechanism further includes a control structure, and at least one of the supports is provided with the control structure; the control structure includes a rack, a gear and a handle, the rack is movably disposed on the support, the gear is coaxially rotatably connected to one end of the rotating rod and meshes with the rack, and the handle is disposed on the rack.

[0015] In some embodiments of this application, the film cutting mechanism further includes a lower film feeding mechanism, which includes a transmission structure, a support base, and a lower clamping plate. The transmission structure includes a first transmission rod, a transmission base, and a second transmission rod arranged sequentially from top to bottom. The two ends of the first transmission rod are respectively hinged to one end of the transmission base and the support base. The second transmission rod is connected to the lower clamping plate, and the two ends of the transmission rod are respectively hinged to the other end of the transmission base and the support base. The lower clamping plate is provided with lower comb teeth. The second part is provided with a contact portion. When the second part rotates relative to the frame to drive the comb teeth to move forward, it can push the first transmission rod downward and make the lower clamping plate and the first part close together vertically, and the lower comb teeth are aligned with the comb teeth.

[0016] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects: In the film-cutting mechanism of this embodiment, in the initial state, the comb teeth of the film feeding mechanism are in a rearward position, and the clamping parts of the fixed seat and the movable seat are separated. The comb teeth are used to position and support the cling film released from the cling film roll. At the start of operation, the comb teeth move forward and extend into the space between the clamping part and the fixed seat, pulling the cling film between them. Then, the movable seat moves relative to the fixed seat, causing the clamping part to gradually pass between adjacent comb teeth and gradually close with the fixed seat. During this process, the clamping part gradually presses the portion of the cling film between adjacent comb teeth onto the fixed seat, thus forming a clamping grip on the cling film with the clamping part and the fixed seat. Next, the film-pulling mechanism moves forward as a whole. Since the cling film is clamped between the clamping part and the fixed seat, the overall movement of the film-pulling mechanism can continuously pull the cling film forward. Finally, when the film-pulling mechanism has moved forward to a certain position, i.e., when the cling film has been pulled out to a certain length, the cutting mechanism performs a cutting operation to cut a section of cling film suitable for subsequent packaging. Because the clamping part can clamp the plastic wrap by passing between two adjacent comb teeth and forming an upper and lower closing with the fixing seat, the comb teeth provide stable positioning and support for the plastic wrap during this process, reducing the possible deviation and shaking of the plastic wrap, thereby ensuring that the plastic wrap can be accurately and stably stretched and cut. Attached Figure Description

[0017] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein: Figure 1 This is a schematic diagram of a cutting membrane mechanism according to an exemplary embodiment.

[0018] Figure 2 yes Figure 1 Enlarged schematic diagram of the two membrane stretching mechanisms.

[0019] Figure 3 yes Figure 1 A schematic diagram of the exploded structure after the rack is removed.

[0020] Figure 4 yes Figure 3 Detailed structural diagrams of the middle film feeding mechanism and the lower film feeding mechanism.

[0021] The annotations in the attached figures are explained as follows: 1. Film feeding mechanism; 11. Traction structure; 111. First part; 1111. Comb teeth; 112. Second part; 1121. Contact part; 12. Roller; 13. Support; 14. Rotating rod; 15. Control structure; 151. Rack; 152. Gear; 153. Handle; 2. Film stretching mechanism; 21. Front film stretching mechanism; 22. Rear film stretching mechanism; 23. Fixed base; 24. Movable base; 241. Clamping part; 2411. Main body; 2412. Connecting part; 242. Rotating part; 25. Connecting seat; 26. Rotating rod; 27. Drive assembly; 271. Cylinder; 272. Connecting rod; 28. Guide assembly; 281. Guide column; 282. Slide; 29. ​​Displacement assembly; 291. Motor; 292. Synchronous belt; 293. Synchronous belt pulley; 3. Cutting mechanism; 31. Base; 32. Blade holder; 33. Blade; 4. Film feeding mechanism; 41. Transmission structure; 411. First transmission rod; 412. Transmission seat; 413. Second transmission rod; 42. Support seat; 43. Lower clamping plate; 431. Lower comb teeth; 5. Frame. Detailed Implementation

[0022] Although the present invention can be readily embodied in two different forms of membrane-stretching mechanisms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0023] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0024] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0025] Please see Figures 1 to 3The film-cutting mechanism 2 provided in one embodiment of this utility model is installed on the frame 5 of a plastic wrap packaging machine. It mainly includes a film feeding mechanism 1, a film-pulling mechanism 2, and a cutting mechanism 3. The film feeding mechanism 1 has several comb teeth 1111 spaced apart in the left-right direction and is movably mounted on the frame 5. The film feeding mechanism 1 moves relative to the frame 5 to drive the comb teeth 1111 to move forward or backward. The film-pulling mechanism 2 is movably mounted on the frame 5 and includes a fixed seat 23 and a movable seat 24 arranged vertically. The movable seat 24 has several clamping parts 241 spaced apart in the left-right direction and is movably connected to the fixed seat 23. The movable seat 24 moves relative to the fixed seat 23 to drive the clamping parts 241 to close or separate from the fixed seat 23. The cutting mechanism 3 is mounted on the frame 5 and is used to perform the cutting operation. When the clamping part 241 separates from the fixed seat 23, and the comb teeth 1111 move forward and extend between the clamping part 241 and the fixed seat 23, the movable seat 24 can move and drive the clamping part 241 through the space between two adjacent comb teeth 1111, so that the clamping part 241 and the fixed seat 23 close up and down.

[0026] In the film cutting mechanism 2 of this embodiment, in the initial state, the comb teeth 1111 of the film feeding mechanism 1 are in a rearward state, and the clamping part 241 of the fixed seat 23 and the movable seat 24 are separated. The comb teeth 1111 are used to position and support the plastic wrap released from the plastic wrap roll. When starting work, the comb teeth 1111 are first moved forward and inserted to drive the plastic wrap into the space between the clamping part 241 and the fixed seat 23. Then, the movable seat 24 is moved relative to the fixed seat 23, causing the clamping part 241 to gradually pass between two adjacent comb teeth 1111 and gradually close with the fixed seat 23. During this process, the clamping part 241 gradually presses the part of the plastic wrap located between two adjacent comb teeth 1111 onto the fixed seat 23. Thus, the clamping part 241 and the fixed seat 23 form a clamping of the plastic wrap. Then, the film-pulling mechanism 2 is moved forward as a whole. Since the cling film is clamped between the clamping part 241 and the fixing seat 23, the overall movement of the film-pulling mechanism 2 can drive the cling film to be continuously pulled forward. Finally, when the film-pulling mechanism 2 has moved forward to a certain position, that is, when the cling film has been pulled out to a certain length, the cutting mechanism 3 performs a cutting operation to cut a piece of cling film that can be used for subsequent packaging. Since the clamping part 241 can clamp the cling film by closing with the fixing seat 23 between two adjacent comb teeth 1111, the comb teeth 1111 provide stable positioning and support for the cling film during this process, reducing the possible offset and shaking of the cling film, thereby ensuring that the cling film can be accurately and stably pulled and cut.

[0027] In a specific embodiment, two film-pulling mechanisms 2 are provided, namely a front film-pulling mechanism 21 and a rear film-pulling mechanism 22 arranged sequentially from front to back. The front film-pulling mechanism 21 and the rear film-pulling mechanism 22 are configured such that the clamping part 241 of the front film-pulling mechanism 21 and the clamping part 241 of the rear film-pulling mechanism 22 pass sequentially between two adjacent comb teeth 1111 and close vertically with the corresponding fixing seat 23. The cutting mechanism 3 is used to perform a cutting operation between the film feeding mechanism 1 and the rear film-pulling mechanism 22.

[0028] The clamping part 241 and the fixing seat 23 of the front film pulling mechanism 21 first clamp the plastic wrap between two adjacent comb teeth 1111 and pull the plastic wrap a certain distance. During this process, the clamping part 241 and the fixing seat 23 of the rear film pulling mechanism 22 clamp the plastic wrap between two adjacent comb teeth 1111 and move forward away from the film feeding mechanism 1. Then the cutting mechanism 3 cuts the plastic wrap between the rear film pulling mechanism 22 and the film feeding mechanism 1. This allows the cutting of a section of plastic wrap that is stably clamped by the front film pulling mechanism 21 and the rear film pulling mechanism 22 respectively, so as to facilitate subsequent packaging. Through the coordinated cooperation of the front film pulling mechanism 21 and the rear film pulling mechanism 22, the stability and accuracy of the film pulling and cutting process are further improved.

[0029] It should be noted that in the above embodiments, the clamping portions 241 of the front film-pulling mechanism 21 and the rear film-pulling mechanism 22 pass sequentially through two adjacent comb teeth 1111. Alternatively, the front and rear film-pulling mechanisms 22 may always be positioned behind the comb teeth 1111 during their forward movement, with the front and rear film-pulling mechanisms 21 and 22 moving forward sequentially to clamp the plastic wrap. Or, the rear film-pulling mechanism 22 may always be positioned behind the comb teeth 1111 during their forward movement, with the comb teeth 1111 extending directly between the fixing seat 23 and the clamping portion 241 of the front film-pulling mechanism 21, and the rear film-pulling mechanism 22 subsequently moving forward to clamp the plastic wrap from the gaps between the comb teeth 1111. Alternatively, the gap between the fixing seat 23 and the clamping part 241 of the rear film pulling mechanism 22 can make way for other parts of the film feeding mechanism 1. The comb teeth 1111 first pass between the fixing seat 23 and the clamping part 241 of the rear film pulling mechanism 22, and then extend into the gap between the fixing seat 23 and the clamping part 241 of the front film pulling mechanism 21. Subsequently, the rear film pulling mechanism 22 moves to position the comb teeth 1111 between its fixing seat 23 and the clamping part 241. In this embodiment, the latter method is specifically implemented.

[0030] Please see Figure 3In a specific embodiment, the membrane stretching mechanism 2 further includes a connecting seat 25, which is supported below the fixed seat 23. The clamping part 241 includes a main body part 2411 and a connecting part 2412 connected in an L-shape. The main body part 2411 is used to close vertically with the fixed seat 23. The movable seat 24 further includes a rotating part 242, which is connected to the connecting part 2412 of each clamping part 241 and is arranged opposite to each main body part 2411. The rotating part 242 is rotatably mounted on the connecting seat 25, and the axis of rotation of the rotating part 242 extends horizontally in the left-right direction.

[0031] The connecting seat 25 provides a stable support base for the fixed seat 23 and the movable seat 24, ensuring the reliability of the overall structure. The connecting part 2412 is used to ensure that when the rotating part 242 rotates relative to the connecting seat 25, the main body part 2411 can pass through the two adjacent comb teeth 1111 and close up and down with the movable seat 24. Through the rotational relationship between the rotating part 242 and the connecting seat 25, as well as the positional relationship between the rotating part 242, the connecting part 2412 and the main body part 2411, the degree of closing and separation between the main body part 2411 and the fixed seat 23 can be precisely controlled by rotation, ensuring the clamping effect and adapting to cling film of different thicknesses and materials.

[0032] In this embodiment, the main body 2411 is provided with an adhesive strip, and the main body 2411 is joined to the fixing seat 23 by the adhesive strip.

[0033] In other embodiments, the movable seat 24 and the connecting seat 25 are movably connected in a vertical direction, and the top end of the movable seat 24 is a clamping part 241.

[0034] In a specific embodiment, the film stretching mechanism 2 further includes a rotating rod 26 and a drive assembly 27. The rotating rod 26 is rotatably connected to the connecting seat 25 and connected to the rotating part 242. The drive assembly 27 includes a cylinder 271 and a connecting rod 272. The cylinder 271 is disposed on the connecting seat 25, and the two ends of the connecting rod 272 are respectively hinged to the output end of the cylinder 271 and the rotating rod 26.

[0035] The cylinder 271 drive method is characterized by simple control and fast response speed. The structure of cylinder 271 and connecting rod 272 is relatively simple, which facilitates daily maintenance and repair. In addition, the overall weight is relatively light, which helps to promote the lightweighting of the overall structure.

[0036] In other embodiments, the drive component 27 is a motor, the output end of which is connected to the end of the rotating rod 26 to drive the rotating rod 26 to rotate.

[0037] In a specific embodiment, two rotating rods 26 are arranged side by side in the front-to-back direction. Several movable seats 24 are arranged sequentially in the left-to-right direction. Some of these movable seats 24 correspond to one of the rotating rods 26, while the remaining seats correspond to the other rotating rod 26. By setting two rotating rods 26 and controlling different movable seats 24 respectively, the movement of the clamping part 241 can be flexibly adjusted according to actual needs, thereby improving the adaptability and flexibility of the mechanism.

[0038] In a specific embodiment, among the plurality of movable seats 24, the movable seats 24 located on both sides in the left-right direction correspond to the rear rotating rod 26 in the front-back direction, and the movable seat 24 in the center corresponds to the rotating rod 26 located on the front side. The rear rotating rod 26 first drives the movable seats 24 on both sides to clamp, which can apply a relatively stable clamping force to the edge part of the plastic wrap and prevent the plastic wrap from slipping off the edge during the stretching process. Subsequently, the front rotating rod 26 drives the central movable seat 24 to clamp, which can further fix the middle part of the plastic wrap and ensure that the entire plastic wrap is subjected to uniform force in the horizontal direction, thereby improving the stability of the clamping process.

[0039] Please see Figure 1 and Figure 3 In a specific embodiment, the film stretching mechanism 2 further includes a guide assembly 28 and a displacement assembly 29. The guide assembly 28 includes a guide post 281 extending forward and backward and a slide block 282 sleeved on the guide post 281. The guide post 281 is mounted on the frame 5, and the slide block 282 is connected to the fixed seat 23. The displacement assembly 29 includes a motor 291, a synchronous belt 292, and two synchronous pulleys 293. The two synchronous pulleys 293 are arranged side by side at intervals in the forward and backward direction. The motor 291 is mounted on the frame 5, and its output end is connected to one synchronous pulley 293. The other synchronous pulley 293 is connected to the frame 5. The synchronous belt 292 is sleeved on both synchronous pulleys 293 and connected to the connecting seat 25. The displacement assembly is used to drive the film stretching mechanism 2 to move forward and backward relative to the frame 5, and the guide assembly 28 is used to provide guidance for the movement of the film stretching mechanism 2.

[0040] Please see Figure 3 In a specific embodiment, the film feeding mechanism 1 includes a traction structure 11 and two rollers 12. The traction structure 11 includes a first part 111 and a second part 112 connected in an L-shape. The end of the first part 111 away from the second part 112 is provided with comb teeth 1111. The second part 112 is rotatably mounted on the frame 5 and rotates relative to the frame 5 to drive the comb teeth 1111 to move forward or backward. The two rollers 12 are respectively located at the end of the second part 112 away from the first part 111 and at the connection between the second part 112 and the first part 111, and are both located on the side of the second part 112 facing away from the first part 111.

[0041] Specifically, the plastic wrap passes in sequence around the roller 12 located at the end of the second part 112 away from the first part 111 and the roller 12 located at the connection between the second part 112 and the first part 111, and extends along the first part 111 towards the end where the comb teeth 1111 are located. Through the specific structural design of the traction structure 11 and the specific arrangement of the two rollers 12, the traction structure 11 can stably perform the film feeding action when the second part 112 rotates relative to the frame 5, and the operation is more flexible and smooth.

[0042] In this embodiment, the traction structure 11 includes a clamp seat and a clamp. The clamp has an L-shaped structure and includes a connecting clamp and a main clamp. The connecting clamp is connected to the clamp seat and forms a second part 112. The main clamp forms a first part 111. The clamp seat is rotatably mounted on the frame 5.

[0043] In other embodiments, the film feeding mechanism 1 includes a traction structure 11 and a roller 12. The traction structure 11 and the film pulling mechanism 2 are arranged side by side in the front-back direction and are movable on the frame 5. The front end of the traction structure 11 is provided with comb teeth 1111 and the rear end is provided with roller 12.

[0044] Please see Figures 1 to 4 In a specific embodiment, the film feeding mechanism 1 further includes supports 13 and a rotating rod 14. Two supports 13 are arranged side-by-side at intervals in the left-right direction, located on the left and right sides of the traction structure 11 respectively, and connected to the frame 5 respectively. The rotating rod 14 is connected to the second part 112, and its two ends are rotatably connected to the two supports 13 respectively, so that the second part 112 is rotatably mounted on the frame 5. The supports 13 and the rotating rod 14 are provided to ensure that the second part 112 can rotate smoothly and reliably, reducing the shaking and deviation caused by structural instability, thereby improving the reliability of the film feeding mechanism 1.

[0045] In a specific embodiment, the film feeding mechanism 1 further includes a control structure 15, and at least one support 13 is provided with the control structure 15. The control structure 15 includes a rack 151, a gear 152, and a handle 153. The rack 151 is movably mounted on the support 13. The gear 152 is coaxially rotatably connected to one end of the rotating rod 14 and meshes with the rack 151. The handle 153 is mounted on the rack 151. Through the coordinated operation of the handle 153, rack 151, gear 152, and rotating rod 14, the operator's action of pushing the rack 151 can be converted into the rotation of the rotating rod 26, making operation easier and less strenuous.

[0046] Please see Figure 3 and Figure 4In a specific embodiment, the film cutting mechanism 2 further includes a lower film feeding mechanism 4. The lower film feeding mechanism 4 includes a transmission structure 41, a support base 42, and a lower clamping plate 43. The transmission structure 41 includes a first transmission rod 411, a transmission base 412, and a second transmission rod 413 arranged sequentially from top to bottom. The two ends of the first transmission rod 411 are respectively hinged to one end of the transmission base 412 and the support base 42. The second transmission rod 413 is connected to the lower clamping plate 43, and the two ends of the transmission rod are respectively hinged to the other end of the transmission base 412 and the support base 42. The lower clamping plate 43 is provided with lower comb teeth 431. The second part 112 is provided with a contact part 1121. When the second part 112 rotates relative to the frame 5 to drive the comb teeth 1111 to move forward, it can push the first transmission rod 411 downward and make the lower clamping plate 43 and the first part 111 close together, and the lower comb teeth 431 are aligned with the comb teeth 1111.

[0047] The lower film feeding mechanism 4 works in coordination with the film feeding mechanism 1. While the comb teeth 1111 of the film feeding mechanism 1 move forward, the second part 112 rotates, driving the contact part 1121 to push against the first transmission rod 411. The motion is then transmitted to the second transmission rod 413 via the transmission seat 412, which ultimately causes the second transmission rod 413 to drive the lower clamping piece 43 to move upward. This achieves the closing of the lower clamping piece 43 with the first part 111. The lower clamping piece 43 of the lower film feeding mechanism 4 closes with the first part 111, and the lower comb teeth 431 are aligned with the comb teeth 1111. This allows for better clamping and conveying of the plastic wrap, improving the stability and reliability of the film feeding and preventing the plastic wrap from falling off or shifting during the conveying process.

[0048] Please see Figure 1 and Figure 3 In the above embodiments, the cutting mechanism 3 is located above the film stretching mechanism 2 and includes a base 31, an electromagnetic drive assembly, a knife holder 32 and a blade 33. The electromagnetic drive assembly is located inside the base 31 and connected to the knife holder 32. The blade 33 is mounted on the knife holder 32. When the electromagnetic drive assembly is activated, it drives the knife holder 32 to move the blade 33 down to complete the cutting of the plastic wrap.

[0049] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A film-cutting mechanism, installed on the frame of a plastic wrap packaging machine, characterized in that, include: The film feeding mechanism has a number of comb teeth arranged at intervals in the left-right direction and is movably mounted on the frame. The film feeding mechanism moves relative to the frame to drive the comb teeth to move forward or backward. The film stretching mechanism is movably mounted on the frame and includes a fixed seat and a movable seat arranged vertically. The movable seat includes a plurality of clamping parts arranged at intervals in the left-right direction and is movably connected to the fixed seat. The movable seat moves relative to the fixed seat to drive the clamping parts to close or separate from the fixed seat vertically. A cutting mechanism, mounted on the frame, is used to perform a cutting operation between the film feeding mechanism and the film pulling mechanism; When the clamping part separates from the fixed seat, and the comb teeth move forward and extend between the clamping part and the fixed seat, the movable seat can move and drive the clamping part through the space between two adjacent comb teeth, and cause the clamping part and the fixed seat to close up and down.

2. The film cutting mechanism according to claim 1, characterized in that, The membrane stretching mechanism is provided in two parts, namely a front membrane stretching mechanism and a rear membrane stretching mechanism; The front film pulling mechanism and the rear film pulling mechanism are arranged sequentially, and configured such that the clamping part of the front film pulling mechanism and the clamping part of the rear film pulling mechanism pass through the space between the two adjacent comb teeth and close together with the corresponding fixing seat. The cutting mechanism is used to perform a cutting operation between the film feeding mechanism and the film pulling mechanism.

3. The film cutting mechanism according to claim 1, characterized in that, The film stretching mechanism also includes a connecting seat, which is supported below the fixed seat; The clamping part includes a main body and a connecting part connected in an L-shape, and the main body is used to close together with the fixing base from top to bottom; The movable seat also includes a rotating part, which is connected to the connecting part of each of the clamping parts and is arranged opposite to each of the main body parts. The rotating part is rotatably mounted on the connecting seat, and the rotation axis of the rotating part extends horizontally in the left-right direction.

4. The film cutting mechanism according to claim 3, characterized in that, The film stretching mechanism further includes a rotating rod and a drive assembly. The rotating rod is rotatably connected to the connecting seat and connected to the rotating part. The drive assembly includes a cylinder and a connecting rod. The cylinder is disposed on the connecting seat, and the two ends of the connecting rod are respectively hinged to the output end of the cylinder and the rotating rod.

5. The film cutting mechanism according to claim 4, characterized in that, Two rotating rods are arranged side by side in the front-to-back direction; Several movable seats are arranged sequentially in the left-right direction. Some of the movable seats correspond to one of the rotating rods, and the rest correspond to another rotating rod.

6. The film cutting mechanism according to claim 5, characterized in that, Among the plurality of movable seats, the movable seats located on both sides in the left-right direction correspond to the rotating rod located on the rear side in the front-back direction among the two rotating rods, and the movable seat in the middle corresponds to the rotating rod located on the front side.

7. The film cutting mechanism according to claim 1, characterized in that, The film feeding mechanism includes a traction structure and two rollers; The traction structure includes a first part and a second part connected in an L-shape. The comb teeth are provided at the end of the first part away from the second part. The second part is rotatably mounted on the frame and rotates relative to the frame to drive the comb teeth to move forward or backward. The two rollers are located at the end of the second part away from the first part and at the connection between the second part and the first part, respectively, and are both located on the side of the second part facing away from the first part.

8. The film cutting mechanism according to claim 7, characterized in that, The film feeding mechanism further includes supports and a rotating rod. Two supports are arranged side by side at intervals in the left-right direction. The two supports are located on the left and right sides of the traction structure and are respectively connected to the frame. The rotating rod is connected to the second part. The two ends of the rotating rod are rotatably connected to the two supports respectively, so that the second part is rotatably mounted on the frame.

9. The film cutting mechanism according to claim 8, characterized in that, The film feeding mechanism further includes a control structure, and at least one of the supports is provided with the control structure; The control structure includes a rack, a gear, and a handle. The rack is movably mounted on the support. The gear is coaxially rotatably connected to one end of the rotating rod and meshes with the rack. The handle is mounted on the rack.

10. The film cutting mechanism according to claim 7, characterized in that, It also includes a film feeding mechanism, which includes a transmission structure, a support base, and a lower clamping plate. The transmission structure includes a first transmission rod, a transmission base, and a second transmission rod arranged sequentially from top to bottom. The two ends of the first transmission rod are respectively hinged to one end of the transmission base and the support base. The second transmission rod is connected to the lower clamping plate, and the two ends of the transmission rod are respectively hinged to the other end of the transmission base and the support base. The lower clamping plate is provided with lower comb teeth. The second part is provided with a contact part. When the second part rotates relative to the frame to drive the comb teeth to move forward, it can push the first transmission rod downward and make the lower clamping piece close with the first part, and the lower comb teeth are aligned with the comb teeth.

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