A film supply device suitable for film packaging machine

Abstract

The utility model relates to the technical field of packaging machinery, and in particular to a film supply device suitable for a film packaging machine, comprising a frame, on which a film roll supporting position 1 for supporting a main film roll, a film roll supporting position 2 for supporting a spare film roll, a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism arranged on both sides of the film splicing mechanism, and a film pulling mechanism for conveying the film roll; the film roll of the main film roll is conveyed in sequence through the film guide roller, the film cutting mechanism on one side of the film splicing mechanism, the film splicing mechanism, and the film pulling mechanism; the film roll of the spare film roll is input into the film splicing mechanism through the film guide roller and the film cutting mechanism on the other side of the film splicing mechanism to wait for film splicing; a film roll damping mechanism is fixedly arranged at one end of the film roll supporting position 1 and the film roll supporting position 2, and the film roll damping mechanism is connected to the film threading shaft of the main film roll and the spare film roll through a coupling transmission. Through the film supply device, the problem of the film roll being easy to shake and rebound due to the long unpowered length during the film supply process can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging machinery, in particular to a film supply device suitable for a film packaging machine. Background Art

[0002] At present, in the field of film packaging machine machinery, there are many types of film supply devices that can realize automatic film feeding, film cutting, and automatic film splicing without stopping. For example, the invention patent with the publication date of July 10, 2020, the publication number of CN111392472A, and the name of "An automatic film splicing mechanism" includes: a mounting frame; a first film supply unit, which is arranged on the mounting frame, and the first film supply unit includes a first film roll for storing a main film body; a second film supply unit, which is arranged on the mounting frame, and the second film supply unit includes a second film roll for storing a spare film body; a first film cutting unit, which is fixedly connected to the mounting frame, and the first film cutting unit is used to cut off the main film body on the first film roll; a bonding unit, which is used to bond the spare film body on the second film roll to the cut main film body.

[0003] In the above technology, the film supply unit includes a connected air shaft and a servo motor. When the film roll needs to be replaced, the air shaft and the servo motor need to be removed from the mounting frame, which makes it inconvenient to replace the film roll. At the same time, the film splicing mechanism has a long unpowered length during the film supply process, and the film roll is prone to shaking and rebounding during the conveying process. Summary of the invention

[0004] In order to solve the above technical problems, the utility model proposes a film supply device suitable for a film packaging machine, which can effectively solve the problem that the unpowered length is long during the film supply process, causing the roll film to easily shake and rebound.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] A film supply device suitable for a film packaging machine comprises a frame, on which a film roll supporting position 1 for supporting a main film roll, a film roll supporting position 2 for supporting a spare film roll, a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism arranged on both sides of the film splicing mechanism and a film pulling mechanism for conveying the rolled film are arranged; the rolled film of the main film roll is conveyed in sequence via the film guide roller, the film cutting mechanism on one side of the film splicing mechanism, the film splicing mechanism and the film pulling mechanism; the rolled film of the spare film roll is input into the film splicing mechanism via the film guide roller and the film cutting mechanism on the other side of the film splicing mechanism to wait for film splicing; a film roll damping mechanism is fixedly arranged at one end of the film roll supporting position 1 and the film roll supporting position 2, and the film roll damping mechanism is connected to the film passing shafts of the main film roll and the spare film roll through a coupling.

[0007] It also includes a base, the frame is slidably assembled on the base, and an adjustment mechanism is arranged on the base. The adjustment mechanism is connected to the frame and is used to adjust the relative position of the frame and the base.

[0008] The first film roll supporting position and the second film roll supporting position are located on one side of the frame, and a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism and a film pulling mechanism are located on the other side of the frame.

[0009] The first film roll supporting position is located above the second film roll supporting position.

[0010] The coupling includes a first connector arranged at one end of the membrane-penetrating shaft and a second connector arranged at one end of the membrane-rolling damping mechanism; the first connector and the second connector both include a connector body and a transfer boss extending outward from the connector body, and one side of the transfer boss forms a splicing notch with the connector body; when the first connector and the second connector are spliced ​​together, the transfer bosses of the first connector and the second connector are opposite, the transfer boss of the first connector is located at the splicing notch on one side of the transfer boss of the second connector, and the transfer boss of the second connector is located at the splicing notch on one side of the transfer boss of the first connector.

[0011] The splicing surface where the transfer boss of the first connector contacts the transfer boss of the second connector is a plane.

[0012] The splicing surface where the transfer boss of the first connector is in contact with the transfer boss of the second connector is a broken line surface.

[0013] The film bonding mechanism comprises a first film bonding roller, a second film bonding roller and a driving assembly, and the driving assembly drives the first film bonding roller and the second film bonding roller to move towards or away from each other.

[0014] The film joining mechanism comprises a first film joining roller, a second film joining roller, an ironing plate, an ironing bottom plate, and a first driving member for driving the ironing plate to move away from or toward the ironing bottom plate.

[0015] The ironing plate and the ironing bottom plate are respectively located at the output ends of the first film-joining roller and the second film-joining roller.

[0016] It also includes a driving component for driving the first film-joining roller and the second film-joining roller to move toward or away from each other.

[0017] The film-drawing mechanism comprises two film-drawing rollers arranged in parallel and a second driving member for driving the film-drawing rollers to move.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1. In the utility model, the unpowered length of the rolled film can be reduced by arranging the film guide roller and the film pulling mechanism, and the structural arrangement of each component enables the rolled film of the main film roll to be transported in sequence through the film guide roller, the film cutting mechanism on one side of the film splicing mechanism, the film splicing mechanism and the film pulling mechanism, and the rolled film of the spare film roll is input into the film splicing mechanism through the film guide roller and the film cutting mechanism on the other side of the film splicing mechanism to wait for film splicing. The structural arrangement is more reasonable, and the probability of shaking and rebounding of the rolled film is further reduced.

[0020] Furthermore, in the present application, the film roll damping mechanism is connected to the film threading shafts of the main film roll and the spare film roll through a coupling transmission. When replacing the film roll, there is no need to remove the film roll damping mechanism, which reduces the workload and makes replacement more convenient.

[0021] 2. In the utility model, the relative position of the frame and the base can be adjusted, which is convenient for adjusting the positions of the components on the frame as a whole so that they can better cooperate with the components of other processes.

[0022] 3. The film roll supporting position 1 and the film roll supporting position 2 are located on one side of the frame, and a number of film guide rollers, film joining mechanisms, film cutting mechanisms and film pulling mechanisms are located on the other side of the frame. The positions of various components are arranged reasonably, especially to facilitate the replacement of the film rolls at the film roll supporting position 1 and the film roll supporting position 2, so as not to interfere with other components.

[0023] 4. The first film roll supporting position is located above the second film roll supporting position, so that the film supply device is designed in a vertical structure, which is convenient for better setting of the film roll conveying route.

[0024] 5. The coupling has a simple structure and is easy to install and separate. Since the first connector and the second connector are contact-connected, when the film roll needs to be replaced, it is only necessary to remove the film-penetrating shaft and separate the first connector and the second connector. Since the connector body of the second connector extends outward with a transfer boss, the second connector will automatically rotate under its own gravity so that the transfer boss is always located at the bottom of the second connector, and the splicing surface of the transfer boss faces upward, which is convenient for the installation of the first connector and the film-penetrating shaft. That is, during installation, it is only necessary to align the transfer boss of the first connector with the splicing notch in the second connector, and then place the first connector.

[0025] 6. The joint surface where the transfer boss of the first connector contacts the transfer boss of the second connector is a plane, so that the first connector and the second connector are connected in a plane contact manner, with a simple structure. The separation and installation of the second connector and the first connector are simple, and it is suitable for working conditions that require axis adjustment.

[0026] 7. The joint surface where the transfer boss of the first connector contacts the transfer boss of the second connector is a broken line surface, which can limit the axial movement of the first connector and the membrane-penetrating shaft, so that the connection structure can be used in situations where the axial position of the membrane-penetrating shaft is fixed.

[0027] 8. In the present invention, the provision of the ironing plate and the ironing bottom plate enables the ironing and film-sealing to be achieved, and the provision of the first film-sealing roller and the second film-sealing roller can also achieve a better effect of the ironing and film-sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementations, wherein:

[0029] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0030] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the membrane-penetrating structure in the utility model;

[0032] Figure 4 The structure of the coupling in the utility model is shown in FIG. Figure 1 ;

[0033] Figure 5 The structure of the coupling in the utility model is shown in FIG. Figure 2 ;

[0034] Figure 6 The structure of the utility model is shown in FIG. Figure 3 ;

[0035] Markings in the figure:

[0036] 1. Main film roll, 2. Spare film roll, 3. Magnetic powder clutch, 4. Coupling, 5. Film threading shaft, 6. Film cutting mechanism, 7. First film joining roller, 8. Spare film roll no film detection mechanism, 9. Film pulling roller one, 10. Main film roll no film detection mechanism, 11. Film pulling roller two, 12. Second film joining roller, 13. Color mark detection mechanism, 14. Adjustment mechanism, 15. First connector, 16. Second connector, 17. Ironing plate, 18. Ironing bottom plate. DETAILED DESCRIPTION

[0037] Example 1

[0038] As the basic implementation method of the utility model, refer to the attached specification Figure 1 And the instruction manual Figure 2 The utility model includes a film supply device suitable for a film packaging machine, including a frame, the frame is provided with a film roll supporting position 1 for supporting a main film roll 1, a film roll supporting position 2 for supporting a spare film roll 2, a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism 6 arranged on both sides of the film splicing mechanism, and a film pulling mechanism for conveying the film roll. Figure 3 The film of the main film roll 1 is transported in sequence through the film guide roller, the film cutting mechanism 6 on one side of the film splicing mechanism, the film splicing mechanism and the film pulling mechanism; the film of the spare film roll 2 is input into the film splicing mechanism through the film guide roller and the film cutting mechanism 6 on the other side of the film splicing mechanism to wait for film splicing.

[0039] A film roll damping mechanism is fixedly arranged at one end of the film roll supporting position 1 and the film roll supporting position 2, and the film roll damping mechanism is connected to the film-penetrating shaft 5 of the main film roll 1 and the spare film roll 2 through a coupling 4. The film-penetrating shaft 5 can be an air expansion shaft, which is rotatably arranged on the frame. The film roll damping mechanism can include a magnetic powder clutch 3.

[0040] Example 2

[0041] As a preferred embodiment of the present utility model, this embodiment is a further refinement, supplement and elaboration of the technical solution of the present utility model on the basis of embodiment 1. Specifically, in this embodiment, a base is also included, and a slide rail is provided on the base, and the frame can be slidably assembled on the slide rail of the base. Furthermore, in order to achieve the stability of the movement of the frame, the number of the slide rails can be at least two. An adjustment mechanism 14 is provided on the base, and the adjustment mechanism 14 is connected to the frame to adjust the relative position of the frame and the base. Among them, the adjustment mechanism 14 can adopt a conventional linear motion drive assembly in the field, which can be a cylinder drive, a gear rack drive, and a screw drive, etc.

[0042] Example 3

[0043] As another preferred embodiment of the utility model, this embodiment is a further refinement, supplement and elaboration of the technical solution of the utility model on the basis of embodiment 1 or embodiment 2. In the utility model, since the main film roll 1 and the spare film roll 2 in the film roll supporting position 1 and the film roll supporting position 2 need to be replaced after use, in order not to interfere with the other components, the film roll supporting position 1 and the film roll supporting position 2 can be set on one side of the frame, and arranged in an up-and-down manner. Specifically, the film roll supporting position 1 can be located above the film roll supporting position 2. The remaining components, including a number of film guide rollers, a film joining mechanism, a film cutting mechanism 6 and a film pulling mechanism are located on the other side of the frame.

[0044] Example 4

[0045] As another preferred embodiment of the present utility model, this embodiment is a further refinement, supplement and elaboration of the technical solution of the present utility model on the basis of any one of the embodiments 1 to 3. In the present utility model, the coupling 4 includes a first connector 15 arranged at one end of the film-penetrating shaft 5 and a second connector 16 arranged at one end of the film-rolling damping mechanism. The first connector 15 and the second connector 16 both include a connector body and a transfer boss extending outward from the connector body, and one side of the transfer boss forms a splicing notch with the connector body. When the first connector 15 and the second connector 16 are spliced ​​together, the transfer bosses of the first connector 15 and the second connector 16 are opposite, the transfer boss of the first connector 15 is located at the splicing notch on one side of the transfer boss of the second connector 16, and the transfer boss of the second connector 16 is located at the splicing notch on one side of the transfer boss of the first connector 15.

[0046] For further information, please refer to the attached manual. Figure 4 The splicing surfaces where the transfer boss of the first connector 15 and the transfer boss of the second connector 16 are spliced ​​and contact each other are both flat.

[0047] Furthermore, in order to limit the movement of the first connector 15 and the transmembrane shaft 5 along the axial direction of the transmembrane shaft 5, the splicing surface where the transfer boss of the first connector 15 and the transfer boss of the second connector 16 are spliced ​​and contacted is a broken line surface, so that the coupling 4 in this embodiment can be used in situations where the axial position of the transmembrane shaft 5 is fixed. Among them, corresponding limit blocks and limit grooves can be respectively provided on the splicing surfaces of the transfer bosses of the first connector 15 and the second connector 16.

[0048] For further information, please refer to the attached manual. Figure 5 A raised portion and a recessed portion are provided on the side of the transfer boss relative to the splicing notch, and the raised portion of the transfer boss of the first connecting head 15 is correspondingly engaged with the recessed portion of the transfer boss of the second connecting head 16, and the raised portion of the transfer boss of the second connecting head 16 is correspondingly engaged with the recessed portion of the transfer boss of the first connecting head 15.

[0049] Furthermore, in order to achieve a better limiting effect, the protrusion and the recess share the same wall. The wall can be arranged in a vertical direction. Furthermore, in order to achieve a good guiding effect, the wall can be inclined downward toward the recess.

[0050] Example 5

[0051] As another preferred embodiment of the present invention, this embodiment is a further refinement, supplementation and elaboration of the technical solution of the present invention on the basis of any one of the embodiments 1 to 4. The film bonding mechanism comprises a first film bonding roller 7, a second film bonding roller 12 and a driving assembly, and the driving assembly drives the first film bonding roller 7 and the second film bonding roller 12 to move closer to or away from each other. The driving assembly adopts conventional technical means in the art.

[0052] For example, the driving assembly can also be a film splicing cylinder, which directly drives the first film splicing roller 7 to perform linear motion, so that the first film splicing roller 7 approaches the second film splicing roller 12 and fits with the second film splicing roller 12, and completes automatic film splicing through the double-sided tape attached to the roll film. The driving assembly preferably includes a film splicing cylinder and a transmission assembly, and the transmission assembly includes a first film splicing swing shaft and a second film splicing swing shaft. The first film splicing roller 7 is mounted on the first film splicing swing shaft through a first swing mounting seat, and the second film splicing roller 12 is mounted on the second film splicing swing shaft through a second swing mounting seat; the first film splicing swing shaft and the second film splicing swing shaft can be rotatably mounted on the frame, and the ends of the first film splicing swing shaft and the second film splicing swing shaft are driven by a pair of gear meshing; one end of one of the film splicing swing shafts is fixedly mounted with a film splicing swing arm, one end of the film splicing cylinder is fixedly mounted on the frame, and the other end is connected to the film splicing swing arm; the film splicing cylinder drives the first film splicing swing shaft and the second film splicing swing shaft to rotate back and forth relative to each other, thereby driving the first film splicing roller 7 and the second film splicing roller 12 to swing closer to or away from each other.

[0053] Example 6

[0054] As another preferred embodiment of the present invention, this embodiment is a further refinement, supplementation and elaboration of the technical solution of the present invention based on any one of the embodiments 1 to 4. The film bonding mechanism includes a first film bonding roller 7, a second film bonding roller 12, an ironing plate 17, an ironing bottom plate 18 and a first driving member driving the ironing plate 17 to move away from or close to the ironing bottom plate 18. The first driving member can be an ironing plate cylinder.

[0055] The ironing plate 17 and the ironing bottom plate 18 are arranged opposite to each other and are respectively located at the output ends of the first film-joining roller 7 and the second film-joining roller 12, that is, the output direction of the film roll. Figure 6 , the number of the first film-joining roller 7 and the second film-joining roller 12 is one respectively, and the ironing plate 17 and the ironing bottom plate 18 are arranged below the first film-joining roller 7 and the second film-joining roller 12. Alternatively, the number of the first film-joining roller 7 and the second film-joining roller 12 is at least two. One of the film rolls passes through a plurality of first film-joining rollers 7 in sequence for further transportation, and the other film roll passes through a plurality of second film-joining rollers 12 in sequence for further transportation. The ironing plate 17 is located between the two first film-joining rollers 7, and the ironing bottom plate 18 is located between the two second film-joining rollers 12.

[0056] When film splicing is required, the film roll of the spare film roll 2 and the film roll on the main film roll 1 are further transported through the first film splicing roller 7 and the second film splicing roller 12 respectively, and the ironing plate cylinder extends to heat-seal the film roll between the ironing plate 17 and the sealing bottom plate 18. After completion, the ironing plate cylinder is retracted.

[0057] Example 7

[0058] As another preferred embodiment of the present invention, this embodiment is a further refinement, supplementation and elaboration of the technical solution of the present invention based on Embodiment 6. The film bonding mechanism also includes a driving component. The driving component can be a film bonding cylinder, which drives the first film bonding roller 7 or the second film bonding roller 12 to move, so that the first film bonding roller 7 and the second film bonding roller 12 move closer to or away from each other.

[0059] When the ironing plate 17 and the hot sealing bottom plate 18 are arranged below the first film splicing roller 7 and the second film splicing roller 12, the film of the spare film roll 2 and the film of the main film roll 1 are respectively conveyed downward through the first film splicing roller 7 and the second film splicing roller 12. When film splicing is required, the film splicing cylinder extends to press the first film splicing roller 7 onto the second film splicing roller 12, or press the second film splicing roller 12 onto the first film splicing roller 7, and the ironing plate cylinder extends to heat-seal the film between the ironing plate 17 and the hot sealing bottom plate 18. After completion, the film splicing cylinder and the ironing plate cylinder are retracted at the same time.

[0060] Example 8

[0061] As another preferred embodiment of the present invention, this embodiment further refines, supplements and elaborates the technical solution of the present invention on the basis of any one of Embodiments 1 to 7. The film drawing mechanism includes two parallel film drawing rollers and a second driving member for driving the film drawing rollers to move.

[0062] The film-drawing roller includes a film-drawing roller 1 9 and a film-drawing roller 2 11 arranged opposite to the film-drawing roller 1 9. The film-drawing roller 1 9 can be rotatably arranged on the frame, and the driving assembly can be a motor to drive the film-drawing roller 1 9 to rotate. The frame is also provided with a guide groove, and a slider is also provided in the guide groove. The film-drawing roller 2 11 is assembled on the slider. A spring is also provided between the slider and the frame, so that the film-drawing roller 2 11 can movably press the film roll against the film-drawing roller 1 9.

[0063] The second driving member can also be a motor, which drives the film-drawing roller 1 9 and the film-drawing roller 2 11 to rotate in opposite directions respectively, and drives the film roll between the film-drawing roller 1 9 and the film-drawing roller 2 11 to continue to be transported through friction.

[0064] Example 9

[0065] As another preferred implementation mode of the present utility model, this embodiment is a further refinement, supplement and elaboration of the technical solution of the present utility model on the basis of any one of Embodiments 1 to 8.

[0066] The film cutting mechanism 6 includes an upper cutting knife, a lower cutting knife and a driver, wherein the driver drives the upper cutting knife and / or the lower cutting knife to move, and cuts the roll film passing between the upper cutting knife and the lower cutting knife. The upper cutting knife is mounted on the upper cutting knife holder, and the lower cutting knife is mounted on the lower cutting knife holder.

[0067] The driver may be a linear motion drive assembly, which drives the upper cutting tool holder to move toward the lower cutting tool holder, or drives the lower cutting tool holder to move toward the upper cutting tool holder, or simultaneously drives the upper cutting tool holder and the lower cutting tool holder to move toward each other, and achieves shearing through the cooperation of the lower cutting knife and the upper cutting knife.

[0068] The driver can also be a motor, etc. The lower cutting knife holder is equipped with a lower cutting knife shaft, and the lower cutting knife is equipped on the lower cutting knife shaft. The lower cutting knife shaft rotates under the drive of the driver, driving the lower cutting knife to rotate, and the lower cutting knife cooperates with the upper cutting knife to cut the roll film passing between the upper cutting knife and the lower cutting knife.

[0069] Example 10

[0070] As another preferred embodiment of the present invention, this embodiment is a further refinement, supplementation and elaboration of the technical solution of the present invention on the basis of any one of the embodiments 1 to 9. In this embodiment, various detection devices are also provided to realize intelligent automatic control. The detection device may include a main film roll without film detection mechanism 10, a spare film roll without film detection mechanism 8 and a color mark detection mechanism 13. The color mark detection mechanism 13 may be a color mark electric eye.

[0071] Refer to the instruction manual Figure 3 The film of the main film roll 1 located at the top is transported in sequence through the film guide roller, the film cutting mechanism 6 on one side of the film splicing mechanism, the film splicing mechanism and the film pulling mechanism. The film of the spare film roll 2 located at the bottom is input into the film splicing mechanism through the film guide roller and the film cutting mechanism 6 on the other side of the film splicing mechanism, waiting for film splicing.

[0072] When the main film roll no-film detection mechanism 10 detects that the film on the main film roll 1 has been put away, and the spare film roll no-film detection mechanism 8 detects that there is film on the spare film roll 2, the color mark detection mechanism 13 starts to start waiting for the color mark. When the color mark detection mechanism 13 detects the color mark, it starts to record the current position. When it reaches the trigger position, the film splicing mechanism and the film cutting mechanism 6 act at the same time. The film cutting mechanism 6 cuts off the excess tail film, and the film splicing mechanism presses the film of the main film roll 1 onto the film that has been put on the spare film roll 2 in advance. It is compacted and firmly attached by tape to complete the film splicing. At this time, the spare film roll 2 becomes the used film roll.

[0073] Then, the operator takes off the used main film roll 1 and replaces it with a new one. After the air shaft is inflated, it is put back as the spare film roll 2, and the film of the main film roll 1 is threaded according to the film threading diagram, waiting for the next automatic film splicing.

[0074] When replacing the main film roll 1, since the first connector 15 and the second connector 16 are contact-connected, it is only necessary to remove the inflatable shaft and separate the first connector 15 and the second connector 16. Since the connector body of the second connector 16 extends outward with a transfer boss, the second connector 16 will automatically rotate under its own gravity, so that the transfer boss is always located at the lower part of the second connector 16, and the splicing surface of the transfer boss faces upward, which is convenient for the installation of the first connector 15 and the film-piercing shaft 5. That is, during installation, it is only necessary to align the transfer boss of the first connector 15 with the splicing notch in the second connector 16, and then place the first connector 15.

[0075] To sum up, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

Claims

1. A film supply device suitable for a film packaging machine, characterized in that: The machine comprises a frame, on which a film roll supporting position 1 for supporting a main film roll (1), a film roll supporting position 2 for supporting a spare film roll (2), a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism (6) arranged on both sides of the film splicing mechanism, and a film pulling mechanism for conveying the film roll; the film roll of the main film roll (1) is conveyed in sequence via the film guide roller, the film cutting mechanism (6) on one side of the film splicing mechanism, the film splicing mechanism, and the film pulling mechanism; the film roll of the spare film roll (2) is input into the film splicing mechanism via the film guide roller and the film cutting mechanism (6) on the other side of the film splicing mechanism to wait for film splicing; a film roll damping mechanism is fixedly arranged at one end of the film roll supporting position 1 and the film roll supporting position 2, and the film roll damping mechanism is connected to the film threading shaft (5) of the main film roll (1) and the spare film roll (2) via a coupling (4).

2. A film supply device suitable for a film packaging machine as claimed in claim 1, characterized in that: It also comprises a base, the frame is slidably mounted on the base, an adjustment mechanism (14) is provided on the base, and the adjustment mechanism (14) is connected to the frame and is used to adjust the relative position of the frame and the base.

3. A film supply device suitable for a film packaging machine as claimed in claim 1, characterized in that: The first film roll supporting position and the second film roll supporting position are located on one side of the frame, and a plurality of film guide rollers, a film splicing mechanism, a film cutting mechanism (6) and a film pulling mechanism are located on the other side of the frame.

4. A film supply device suitable for a film packaging machine as claimed in claim 3, characterized in that: The first film roll supporting position is located above the second film roll supporting position.

5. A film supply device suitable for a film packaging machine as claimed in any one of claims 1 to 4, characterized in that: The coupling (4) comprises a first connector (15) arranged at one end of the membrane-penetrating shaft (5) and a second connector (16) arranged at one end of the membrane-rolling damping mechanism; the first connector (15) and the second connector (16) both comprise a connector body and a transfer boss extending outward from the connector body, and one side of the transfer boss forms a splicing notch with the connector body; when the first connector (15) and the second connector (16) are spliced ​​together, the transfer bosses of the first connector (15) and the second connector (16) are opposite to each other, the transfer boss of the first connector (15) is located at the splicing notch on one side of the transfer boss of the second connector (16), and the transfer boss of the second connector (16) is located at the splicing notch on one side of the transfer boss of the first connector (15).

6. A film supply device suitable for a film packaging machine as claimed in claim 5, characterized in that: The splicing surface where the transfer boss of the first connector (15) contacts the transfer boss of the second connector (16) is in a plane.

7. A film supply device suitable for a film packaging machine as claimed in claim 5, characterized in that: The splicing surface where the transfer boss of the first connector (15) and the transfer boss of the second connector (16) are spliced ​​and in contact is a broken line surface.

8. A film supply device suitable for a film packaging machine as claimed in claim 5, characterized in that: The film bonding mechanism comprises a first film bonding roller (7), a second film bonding roller (12) and a driving assembly, wherein the driving assembly drives the first film bonding roller (7) and the second film bonding roller (12) to move towards or away from each other.

9. A film supply device suitable for a film packaging machine as claimed in claim 5, characterized in that: The film joining mechanism comprises a first film joining roller (7), a second film joining roller (12), an ironing plate (17), an ironing bottom plate (18), and a first driving member for driving the ironing plate (17) to move in a direction away from or towards the ironing bottom plate (18).

10. A film supply device suitable for a film packaging machine as claimed in claim 9, characterized in that: The ironing plate (17) and the ironing bottom plate (18) are respectively located at the output ends of the first film-joining roller (7) and the second film-joining roller (12).

11. A film supply device suitable for a film packaging machine as claimed in claim 9, characterized in that: It also includes a driving component that drives the first film-joining roller (7) and the second film-joining roller (12) to move toward or away from each other.

12. A film supply device suitable for a film packaging machine as claimed in claim 5, characterized in that: The film-drawing mechanism comprises two film-drawing rollers arranged in parallel and a second driving member for driving the film-drawing rollers to move.

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