Film making frame mechanism of tissue single packaging machine

Abstract

The utility model relates to the related technical field of tissue packaging, in particular to a film making frame mechanism of a tissue single packaging machine, which comprises a rack, and a buffer film guide mechanism, an easy-to-tear opening forming mechanism, a coding mechanism, a film cutting mechanism and a negative pressure film feeding mechanism which are mounted on the rack and are sequentially arranged along the film material conveying direction, wherein the film cutting mechanism is matched with the negative pressure film feeding mechanism to realize intermittent cutting and vertical conveying of a film material; the buffering film guiding mechanism is used for keeping the film releasing frame in a continuous film releasing state during the intermittent period of the film materials; the easy-to-tear opening forming mechanism is used for forming an easy-to-tear opening in the film material; and the coding mechanism is used for forming bar codes on the film materials. The arranged buffering film guiding mechanism can enable the film placing frame to keep a continuous film placing state in the film material intermittent period, the continuity of the whole process is ensured, the film cutting mechanism is matched with the negative pressure film feeding mechanism, film material conveying and cutting treatment is completed, the film materials can enter the subsequent tissue bag continuous packaging link in the appropriate size and state, and the packaging efficiency is improved. And the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to paper towel packaging related technical field, concretely is a kind of paper towel single packing machine's film making frame mechanism. BACKGROUND

[0002] At present, when the paper product packaging machine is carried out film material pulling film, film material passes through each guide roller on tool rest in turn around film receiving platform, floating film storage frame, tear opening mechanism, film pulling mechanism, film cutting mechanism and negative pressure film suction mechanism, film material is conveyed under the drive of film pulling mechanism, tear opening mechanism is first drawn on film material to draw tear, then cut film knife is cut to form fixed length packaging film, and the cut packaging film is sucked by negative pressure film suction mechanism, and waits for material to be wrapped and packaged.

[0003] In actual operation process, especially in intermittent film feeding and film cutting link, since there is temporary tension fluctuation or tension loss phenomenon in the conveying process of film material, currently, the film material conveying and tension control structure commonly used in paper towel single packing machine mostly adopts the way that two groups of film pulling assemblies work cooperatively, and the conveying and tension maintenance of film material are realized by controlling the start and stop of two groups of film pulling rollers, although two groups of film pulling rollers realize synchronous control through transmission member, but start fluctuation phenomenon is also likely to occur, leading to tension fluctuation of film material. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of paper towel single packing machine's film making frame mechanism to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of paper towel single packing machine's film making frame mechanism, including rack and installation on the rack and sequentially arranged along the film material conveying direction buffer film guide mechanism, easy tear opening forming mechanism, coding mechanism, film cutting mechanism and negative pressure film feeding mechanism, wherein: film cutting mechanism and negative pressure film feeding mechanism cooperate to realize intermittent cutting and vertical conveying of film material;The buffer film guide mechanism is used to keep the film release frame in continuous film release state during intermittent film material;The easy tear opening forming mechanism is used to form easy tear opening on film material;The coding mechanism is used to form bar code on the film material.

[0006] The paper towel single packing machine's film making frame mechanism as described above: the buffer film guide mechanism includes: horizontally oriented roller group that is rotatably installed on the rack;Two guide rods are fixed in vertical direction on rack, and sliding block is slidably installed on the guide rod;Counterweight guide roller group is rotatably installed between two sliding blocks, and film material sent out from film release frame is introduced into horizontally oriented roller group and guided to film material conveying direction after passing through counterweight guide roller group.

[0007] The film making frame mechanism of the single paper towel packaging machine as described above: the easy-to-tear opening forming mechanism comprises: a receiving plate installed on the frame through a mounting frame, the receiving plate forms a cutting receiving position; a fixed frame fixed on the receiving plate, a gap is formed between the receiving plate and the fixed frame; a cutting unit placed in the gap and driven to move vertically by a telescopic drive installed on the fixed frame.

[0008] The film making frame mechanism of the single paper towel packaging machine as described above: the cutting unit comprises: a movable knife holder, a serrated knife is fixed on one side of the movable knife holder facing the receiving plate; further comprising at least one guide column fixed with the movable knife holder, the guide column penetrates through the guide sleeve fixed on the fixed frame and can slide along the axial direction of the guide sleeve.

[0009] The film making frame mechanism of the single paper towel packaging machine as described above: the film cutting mechanism comprises: two side plates symmetrically installed on the frame; a first film pulling roller and a second film pulling roller placed between the two side plates, both ends of the rotating shaft of the first film pulling roller are rotatably installed on the two side plates; an elastic pressing member installed on the side plate, the rotating shaft of the second film pulling roller is rotatably connected with the elastic pressing member, the elastic pressing member generates a pressing force on the second film pulling roller towards the first film pulling roller; a film cutting knife rotatably installed between the two side plates and located below the second film pulling roller.

[0010] The film making frame mechanism of the single paper towel packaging machine as described above: the elastic pressing member comprises: a support sliding block slidably installed on the side plate, the rotating shaft of the second film pulling roller is rotatably connected with the support sliding block; further comprising an elastic member connecting the support sliding block and the side plate, and always in a compressed state, for generating a pressing force on the support sliding block towards the first film pulling roller.

[0011] The film making frame mechanism of the single paper towel packaging machine as described above: the negative pressure film feeding mechanism comprises: two negative pressure conveying units symmetrically arranged, the negative pressure conveying units are driven to rotate by a driving main shaft rotatably installed on the frame, the negative pressure conveying units form a vertical conveying surface for attracting film material; an adjusting unit for adjusting the distance between the two negative pressure conveying units or the conveying position of the two negative pressure conveying units.

[0012] The film making frame mechanism of the single paper towel packaging machine as described above: the negative pressure conveying unit comprises: a sliding frame connected with the adjusting unit and a conveying belt driven to rotate by the driving main shaft, the vertical conveying surface is formed on the conveying belt, and a through hole is formed on the conveying belt; further comprising a negative pressure box placed on the inner side of the conveying belt and connected with a negative pressure connecting member, one side of the negative pressure box facing the vertical conveying surface is in communication with the through hole.

[0013] The film making frame mechanism of the paper towel single packaging machine as described above: the adjusting unit comprises a support guide rod fixed on the frame, and the sliding frame is slidingly installed on the support guide rod; a threaded rod is rotatably installed on the frame, and the threaded rod is axially parallel to the support guide rod and is in threaded connection with the sliding frame.

[0014] Compared with the prior art, the beneficial effects of the paper towel single packaging machine are that: the buffer film guiding mechanism can keep the film frame in a continuous film releasing state during the intermittent period of the film material, ensuring the coherence of the whole process, the easy-to-tear opening forming mechanism forms equidistant easy-to-tear openings on the film material, providing convenience for subsequent use, the code marking mechanism clearly marks bar codes on the film material, facilitating product tracing and management, and the film cutting mechanism and the negative pressure film feeding mechanism cooperate closely to complete the feeding and cutting of the film material, so that the film material can enter the subsequent paper towel bag continuous packaging link in a suitable size and state, improving the production efficiency and packaging quality; the elastic extrusion piece cooperates with the first film pulling roller and the second film pulling roller to clamp the film material, thereby maintaining the tension control of the film material, eliminating the problem that the existing two groups of film pulling assemblies need to be controlled synchronously and are prone to instantaneous asynchronization, resulting in changes in the tension of the film material, and the elastic extrusion piece cooperated between the first film pulling roller and the second film pulling roller can drive the second film pulling roller to rotate synchronously when the first film pulling roller rotates, eliminating the problems of gear wear, unstable transmission and the need for additional maintenance caused by the existing gear transmission, and improving the stability and reliability of equipment operation; in addition, the structure is simple and compact, the number of equipment parts is reduced, and the manufacturing cost and assembly difficulty are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the film making frame mechanism of the paper towel single packaging machine;

[0016] Figure 2 It is a front view of the film making frame mechanism of the paper towel single packaging machine;

[0017] Figure 3 It is a structure schematic view of the frame in the film making frame mechanism of the paper towel single packaging machine;

[0018] Figure 4 It is a structure schematic view of the buffer film guiding mechanism in the film making frame mechanism of the paper towel single packaging machine;

[0019] Figure 5 It is a front view of the buffer film guiding mechanism in the film making frame mechanism of the paper towel single packaging machine;

[0020] Figure 6 It is a structure schematic view of the easy-to-tear opening forming mechanism in the film making frame mechanism of the paper towel single packaging machine;

[0021] Figure 7 It is a front view of the easy-to-tear opening forming mechanism in the film making frame mechanism of the paper towel single packaging machine;

[0022] Figure 8 Structure diagram of a code marking mechanism in a film making frame mechanism of a single wrapping machine for paper towels;

[0023] Figure 9 Structure diagram of a film cutting mechanism in a film making frame mechanism of a single wrapping machine for paper towels;

[0024] Figure 10 Structure diagram of a film cutting mechanism in a film making frame mechanism of a single wrapping machine for paper towels;

[0025] Figure 11 Structure diagram of a negative pressure film feeding mechanism in a film making frame mechanism of a single wrapping machine for paper towels.

[0026] In the figure: 1-frame, 2-buffer film guiding mechanism, 201-horizontal guide roller group, 202-sliding block, 203-guide rod, 204-counterweight guide roller group, 3-easy-to-tear port forming mechanism, 301-mounting frame, 302-accepting plate, 303-fixed frame, 304-air cylinder, 305-moving knife holder, 306-guide column, 307-guide sleeve, 308-sawtooth knife, 4-code marking mechanism, 401-code marking frame, 402-paper feeding roller, 403-mounting plate, 404-code marking head, 5-color mark judging unit, 6-reversing guide roller group, 7-film cutting mechanism, 701-side plate, 702-first film pulling roller, 703-second film pulling roller, 704-supporting sliding block, 705-elastic member, 706-film cutting knife, 8-negative pressure film feeding mechanism, 801-driving main shaft, 802-supporting guide rod, 803-sliding frame, 804-threaded rod, 805-conveying belt, 806-through hole, 807-negative pressure box, 808-negative pressure connecting piece. DETAILED DESCRIPTION

[0027] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings represent the same elements or similar elements. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0028] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0029] In addition, for the purpose of convenience and brevity, detailed descriptions of well-known functions and structures incorporated in the application are omitted. It will be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the application and are included within its spirit and scope.

[0030] Reference will now be made to Figures 1-3The utility model discloses a kind of film making frame mechanisms of paper towel single packing machine, including rack 1 and install on the rack 1 and sequentially set along film material conveying direction Buffer film guide mechanism 2, easy tear port forming mechanism 3, coding mechanism 4, film cutting mechanism 7 and negative pressure film feeding mechanism 8, wherein: film cutting mechanism 7 and negative pressure film feeding mechanism 8 cooperate to realize intermittent cutting and vertical transport of film material;The buffer film guide mechanism 2 is used to keep the film frame to keep continuous film release state during intermittent film material;The easy tear port forming mechanism 3 is used to form easy tear port on film material;The coding mechanism 4 is used to form bar code on the film material.

[0031] In the embodiment, the film material led out from the film frame passes through the easy tear port forming mechanism 3 after bypassing the buffer film guide mechanism 2, so that the easy tear port is formed equidistantly on the film material, and then the film material is coded by the coding mechanism 4, and the film material after coding is transported and cut by the film cutting mechanism 7 and the negative pressure film feeding mechanism 8, which facilitates subsequent continuous packaging of paper towel packs;The buffer film guide mechanism 2 can keep the film frame to keep continuous film release state during intermittent film material according to the conveying rhythm of film material, ensure the coherence of the whole process, the easy tear port forming mechanism 3 forms equidistant easy tear ports on the film material, which provides convenience for subsequent use, the coding mechanism 4 clearly prints bar code on the film material, which facilitates product tracing and management, and the film cutting mechanism 7 and the negative pressure film feeding mechanism 8 cooperate closely to efficiently complete the transport and cutting of the film material, so that the film material can enter the subsequent continuous packaging link of paper towel packs in a suitable size and state, greatly improving the production efficiency and packaging quality.

[0032] It should be noted that the rack 1 is also rotatably installed with a reversing guide roller set 6, which is used to divert the horizontally transported film material to the film cutting mechanism 7.

[0033] The rack 1 is also provided with a color mark determination unit 5, which is mainly used for accurately identifying and determining the color mark on the film material, can quickly and accurately detect the position information of the specific color mark on the film material, and feed back the information to the control system in time. The control system accurately controls the working time and action of the subsequent film cutting mechanism 7 and other components according to the data fed back by the color mark determination unit 5, so as to ensure the accuracy of the coding position and the accuracy of the film cutting size.

[0034] Further, Figure 4 And Figure 5The buffer guide film mechanism 2 comprises: a horizontal guide roller set 201 rotatably installed on the frame 1; two guide rods 203 fixed in the vertical direction on the frame 1, wherein a sliding block 202 is slidably installed on the guide rod 203; and a counterweight guide roller set 204 rotatably installed between the two sliding blocks 202, wherein the film material sent out from the film releasing frame is introduced into the horizontal guide roller set 201 after passing through the counterweight guide roller set 204 and guided to the film material conveying direction.

[0035] The film material is introduced into the horizontal guide roller set 201 after passing through the counterweight guide roller set 204, and since the counterweight guide roller set 204 can slide in the vertical direction, a downward pulling force is generated on the film material, thereby ensuring that the film material is continuously in a tension state, effectively avoiding problems such as relaxation and wrinkling of the film material during conveying, and ensuring the stability and continuity of the film material conveying; at the same time, when the film material stops conveying at the rear conveying section, the film releasing frame is continuously in a film releasing state, the counterweight guide roller set 204 moves downward under the action of gravity to maintain the tension of the film material, and when the rear conveying section starts conveying, since the conveying speed is greater than the film releasing speed of the film releasing frame, the counterweight guide roller set 204 moves upward again under the action of the film material, and such reciprocation can effectively ensure the tension of the film material and the continuity of the film releasing.

[0036] Further, please refer to Figure 6 and Figure 7 The easy-tear port forming mechanism 3 comprises a receiving plate 302 installed on the frame 1 through a mounting bracket 301, wherein the receiving plate 302 forms a cutting receiving position; a fixed bracket 303 fixed on the receiving plate 302, wherein a gap is formed between the receiving plate 302 and the fixed bracket 303; and a cutting unit placed in the gap and vertically moved by a telescopic driving member installed on the fixed bracket 303, wherein the cutting unit comprises: a movable knife holder 305, wherein a sawtooth knife 308 is fixed on one side of the movable knife holder 305 facing the receiving plate 302; and at least one guide column 306 fixed with the movable knife holder 305, wherein the guide column 306 penetrates through a guide sleeve 307 fixed on the fixed bracket 303 and can slide along the axial direction of the guide sleeve 307.

[0037] In the embodiment, the telescopic driving member comprises, but is not limited to, a cylinder 304 installed on the fixed bracket 303, wherein the cylinder 304 is arranged to drive the movable knife holder 305 to move downward, so as to drive the sawtooth knife 308 to move, thereby forming an easy-tear port on the film material.

[0038] Please refer to Figure 8The code printing mechanism 4 comprises a code printing frame 401 installed on the frame 1 and a mounting plate 403 fixed to the code printing frame 401, the mounting plate 403 is provided with a code printing head 404 capable of moving up and down driven by a driving member, and the mounting plate 403 is further provided with a paper feeding roller 402, and the ink ribbon on the paper feeding roller 402 passes directly below the code printing head 404.

[0039] Please refer to Figure 9 and Figure 10 The film cutting mechanism 7 comprises two side plates 701 symmetrically installed on the frame 1, a first film pulling roller 702 and a second film pulling roller 703 arranged between the two side plates 701, both ends of the first film pulling roller 702 are rotatably installed on the two side plates 701, an elastic pressing member is installed on the side plates 701, the rotating shaft of the second film pulling roller 703 is rotatably connected with the elastic pressing member, the elastic pressing member generates a pressing force on the second film pulling roller 703 towards the first film pulling roller 702, and a film cutting knife 706 is rotatably installed between the two side plates 701 and below the second film pulling roller 703.

[0040] The film material passes between the first film pulling roller 702 and the second film pulling roller 703, and the elastic pressing member can effectively cooperate with the first film pulling roller 702 to clamp the film material, so that the film material can be effectively prevented from deviating or loosening due to the loss of tension after being cut, ensuring the stability and accuracy of the cutting process, and this design can also adapt to film materials of different thicknesses and materials, improving the universality and application range of the equipment, and the second film pulling roller 703 rotates with the first film pulling roller 702 to realize the conveying of the film material.

[0041] For example, in one embodiment, the elastic pressing member comprises a support sliding block 704 slidably installed on the side plate 701, and the rotating shaft of the second film pulling roller 703 is rotatably connected with the support sliding block 704, and further comprises an elastic member 705 connected with the support sliding block 704 and the side plate 701 and always in a compressed state, for generating a pressing force on the support sliding block 704 towards the first film pulling roller 702.

[0042] In the embodiment, the elastic extrusion piece cooperates with the first film pulling roller 702 and the second film pulling roller 703 to clamp the film material, so that the tension control of the film material is maintained, the problem that the film material tension changes due to the instantaneous asynchronization of the start and stop of the two groups of film pulling assemblies is eliminated, the elastic extrusion piece cooperated between the first film pulling roller 702 and the second film pulling roller 703 can drive the second film pulling roller 703 to rotate synchronously when the first film pulling roller 702 rotates, the problems of gear wear, unstable transmission and additional maintenance caused by gear transmission are eliminated, and the stability and reliability of the equipment operation are improved. In addition, the structure is simple and compact, the number of equipment parts is reduced, and the manufacturing cost and assembly difficulty are reduced.

[0043] Please refer to Figure 11 The negative pressure film feeding mechanism 8 comprises: two negative pressure conveying units symmetrically arranged, which are driven to rotate by a driving main shaft 801 rotatably arranged on the rack 1, and are formed with vertical conveying surfaces for attracting the film material; and an adjusting unit for adjusting the distance between the two negative pressure conveying units or the conveying positions of the two negative pressure conveying units.

[0044] The film material sent out by the first film pulling roller 702 and the second film pulling roller 703 is adsorbed on the vertical conveying surface by the negative pressure conveying unit, and then is conveyed downward along with the negative pressure conveying unit. When the film material is conveyed to the required position, the film cutting knife 706 cuts the film material, the pushing piece (a pushing mechanism in the packaging machine, used for pushing the tissue package) pushes the tissue package to contact the film material, and the whole film material and the tissue package cut off are moved out.

[0045] In the specific implementation process, the position of the negative pressure conveying unit can be adjusted by the adjusting unit according to different needs, so as to improve the application range.

[0046] For example, in one embodiment, the negative pressure conveying unit comprises: a sliding frame 803 connected to the adjusting unit and a conveying belt 805 driven to rotate by the driving main shaft 801, the vertical conveying surface is formed on the conveying belt 805, and a through hole 806 is formed on the conveying belt 805; and a negative pressure box 807 arranged on the inner side of the conveying belt 805 and connected to a negative pressure connecting piece 808, the side of the negative pressure box 807 facing the vertical conveying surface is in communication with the through hole 806.

[0047] It should be noted that the sliding frame 803 is rotatably arranged with two belt rollers, one of which is sleeved on the driving main shaft 801 and is driven to rotate by the driving main shaft 801, and the other is rotatably connected to the sliding frame 803, and the conveying belt 805 is sleeved on the two belt rollers.

[0048] The negative pressure machine is connected with the negative pressure box 807 through the negative pressure connecting piece 808, so that negative pressure is generated in the negative pressure box 807; when the film material is attached to the conveying belt 805, the film material is fixed in position by the negative pressure and is not moved when the conveying belt 805 rotates, so that the film material is uniformly conveyed without being wrinkled or deviated.

[0049] In an exemplary embodiment, the adjusting unit comprises a support guide rod 802 fixed on the frame 1, and a sliding frame 803 slidingly installed on the support guide rod 802; a threaded rod 804 is rotatably installed on the frame 1, and the threaded rod 804 is axially parallel to the support guide rod 802 and is threadedly connected with the sliding frame 803.

[0050] The axial position of the sliding frame 803 relative to the support guide rod 802 can be adjusted by rotating the threaded rod 804, so as to meet different requirements.

[0051] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

[0052] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A film making frame mechanism of a paper towel single packaging machine, characterized by, The application relates to a film cutting and conveying device, which comprises a rack (1), a buffer film guiding mechanism (2), a tearable opening forming mechanism (3), a code marking mechanism (4), a film cutting mechanism (7) and a negative pressure film conveying mechanism (8) which are sequentially arranged on the rack (1) and along the film conveying direction, wherein the film cutting mechanism (7) and the negative pressure film conveying mechanism (8) cooperate to realize intermittent film cutting and vertical conveying; the buffer film guiding mechanism (2) is used for keeping the film releasing frame in a continuous film releasing state during intermittent film releasing; the tearable opening forming mechanism (3) is used for forming a tearable opening on the film; the code marking mechanism (4) is used for forming a bar code on the film; the film cutting mechanism (7) comprises two side plates (701) which are symmetrically arranged on the rack (1), a first film pulling roller (702) and a second film pulling roller (703) which are arranged between the two side plates (701), the two ends of the first film pulling roller (702) are rotatably arranged on the two side plates (701), an elastic pressing piece is arranged on the side plate (701), the rotating shaft of the second film pulling roller (703) is rotatably connected with the elastic pressing piece, the elastic pressing piece generates a pressing force on the second film pulling roller (703) towards the first film pulling roller (702), and a film cutting knife (706) is rotatably arranged between the two side plates (701) and below the second film pulling roller (703).

2. A film making frame mechanism of a paper towel single packaging machine according to claim 1, wherein, The buffer film guiding mechanism (2) comprises horizontally arranged guide roller groups (201) which are rotatably arranged on the rack (1), two guide rods (203) which are fixed on the rack (1) in the vertical direction, sliding blocks (202) which are slidably arranged on the guide rods (203), and counterweight guide roller groups (204) which are rotatably arranged between the two sliding blocks (202), wherein the film released from the film releasing frame passes through the counterweight guide roller groups (204) and is introduced into the horizontally arranged guide roller groups (201) and guided in the film conveying direction.

3. The film making frame mechanism of a paper towel single packaging machine according to claim 1, wherein, The tearable opening forming mechanism (3) comprises a receiving plate (302) which is arranged on the rack (1) through a mounting frame (301), the receiving plate (302) forms a cutting receiving position, a fixed frame (303) is fixed on the receiving plate (302), a gap is formed between the receiving plate (302) and the fixed frame (303), and a cutting unit is arranged in the gap and vertically moved by a telescopic driving piece arranged on the fixed frame (303).

4. The film making frame mechanism of a paper towel single packaging machine according to claim 3, characterized in that, The cutting unit comprises a movable knife holder (305), a sawtooth knife (308) is fixed on one side of the movable knife holder (305) which faces the receiving plate (302), at least one guide column (306) is fixed on the movable knife holder (305), and the guide column (306) penetrates through a guide sleeve (307) fixed on the fixed frame (303) and can slide along the axial direction of the guide sleeve (307).

5. The film making frame mechanism of a paper towel single packaging machine according to claim 1, wherein, The elastic pressing piece comprises a support sliding block (704) slidingly installed on the side plate (701), and a rotating shaft of the second film pulling roller (703) is rotationally connected with the support sliding block (704); further comprising an elastic piece (705) connecting the support sliding block (704) and the side plate (701) and always in a compressed state, for generating a pressing force of the support sliding block (704) towards the first film pulling roller (702).

6. A film making frame mechanism of a paper towel single packaging machine according to claim 1, wherein, The negative pressure film feeding mechanism (8) comprises two symmetrical negative pressure conveying units, the negative pressure conveying units are driven to rotate by a driving main shaft (801) rotationally installed on the frame (1), and the negative pressure conveying units are formed with vertical conveying surfaces for attracting film materials; an adjusting unit is arranged for adjusting the distance between the two negative pressure conveying units or the conveying positions of the two negative pressure conveying units.

7. A film making frame mechanism of a paper towel single packaging machine according to claim 6, characterized in that, The negative pressure conveying unit comprises a sliding frame (803) connected with the adjusting unit and a conveying belt (805) driven to rotate by the driving main shaft (801), the vertical conveying surface is formed on the conveying belt (805), and the conveying belt (805) is formed with a through hole (806); further comprising a negative pressure box (807) arranged on the inner side of the conveying belt (805) and connected with a negative pressure connecting piece (808), and the negative pressure box (807) is in communication with the through hole (806) on the side facing the vertical conveying surface.

8. A film making frame mechanism of a paper towel single packaging machine according to claim 7, characterized in that, The adjusting unit comprises a support guide rod (802) fixed on the frame (1), the sliding frame (803) is slidingly installed on the support guide rod (802), and a threaded rod (804) is rotationally installed on the frame (1), the threaded rod (804) is axially parallel with the support guide rod (802) and is in threaded connection with the sliding frame (803).

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