CN113400789A

CN113400789A - Plastic film double-sided printing device

Info

Publication number: CN113400789A
Application number: CN202110662934.1A
Authority: CN
Inventors: 陆国兴
Original assignee: Anhui Guoweixing New Material Technology Co ltd
Current assignee: Anhui Guoweixing New Material Technology Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-09-17
Anticipated expiration: 2041-06-15
Also published as: CN113400789B

Abstract

The invention discloses a plastic film double-sided printing device which comprises a base, wherein a placing frame is arranged on one side of the top of the base, an installation through groove and an installation groove are respectively formed in the middle positions of two ends of the inside of the placing frame, an annular groove is formed in the middle position of one end of the back surface of the placing frame, a transmission assembly is arranged in the annular groove in a sliding mode, a discharge hole is formed in the middle position of one side of the placing frame, and first installation plates are arranged at two ends of the placing frame, close to the discharge hole. According to the invention, through the mutual matching of the first mounting plate, the transmission component, the first rotating shaft, the brush rollers, the first gear, the chain, the mounting through groove, the annular groove and the mounting groove, the force for driving the film rollers to rotate is taken as power through the movement of the plastic film, so that the two groups of brush rollers are driven to rotate, the double-sided wiping can be performed on the plastic film before the printing is performed, the cleanliness of the plastic film is improved, and the printing quality is improved.

Description

Plastic film double-sided printing device

Technical Field

The invention relates to the technical field of printing devices, in particular to a plastic film double-sided printing device.

Background

The plastic film is a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, and is used for packaging and used as a film coating layer; plastic packages and plastic package products have a growing share in the market, and particularly, composite plastic flexible packages have been widely used in the fields of food, medicine, chemical industry and the like, wherein the proportion of food packages is the largest, such as beverage packages, quick-frozen food packages, steamed and cooked food packages, fast food packages and the like, which bring great convenience to the life of people, and plastic films are printed with patterns on the surfaces thereof in a printing manner so as to be conveniently used in different fields.

The current duplex printing device has certain defects:

1. the surface of the plastic film is stained with dust due to long-time storage and transportation of the plastic film, and if the dust is not cleaned in time, the printed numbers and patterns are incomplete when the plastic film is printed, so that the printing quality is influenced;

2. meanwhile, when printing is started, the plastic film needs to be wound on the winding roller for winding, but when the winding roller rotates, the plastic film is easy to loosen, the winding failure is caused, the plastic film needs to be collected again, the time is delayed, and the operation is not facilitated;

3. simultaneously when the rolling is about to end, the thickness to the rolling that can't be fine is handled the accuse, lacks a fixed same standard, leads to the rolling quality not of uniform size, not only pleasing to the eye still be unfavorable for storage and transportation yet.

Disclosure of Invention

The invention aims to provide a plastic film double-sided printing device, which aims to solve the problems that the surface of a plastic film is stained with dust due to long-time storage and transportation of the plastic film, and the printing quality is influenced due to the fact that printed numbers and patterns are incomplete when the plastic film is printed if the dust is not cleaned in time; meanwhile, when printing is started, the plastic film needs to be wound on the winding roller for winding, but when the winding roller rotates, the plastic film is easy to loosen, the winding failure is caused, the plastic film needs to be collected again, the time is delayed, and the operation is not facilitated; simultaneously when the rolling is about to end, the thickness of rolling that can't be fine is handled the accuse, lacks a fixed same standard, leads to the rolling quality not of uniform size, not only pleasing to the eye still be unfavorable for storage and transportation relevant problem still.

Technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a plastic film double-sided printing device comprises a base, wherein a placing frame is arranged on one side of the top of the base, an installation through groove and an installation groove are respectively arranged at the middle positions of two ends of the interior of the placing frame, an annular groove is arranged at the middle position of one end of the back of the placing frame, a transmission assembly is arranged in the annular groove in a sliding manner, a discharge hole is arranged at the middle position of one side of the placing frame, first installation plates are arranged at two ends of one side of the placing frame, which is close to the discharge hole, first rotating shafts are arranged at the top and the bottom of one end of the two groups of first installation plates, a brush roller is sleeved on the outer sides of the two groups of first rotating shafts, one end of the back of the two groups of first rotating shafts penetrates through the interior of the first installation plates and is provided with first gears, chains are sleeved on the outer sides of the two groups of first gears, and a printing machine is arranged at the middle position of the top of the base, the side, far away from the placing frame, of the two ends of the base is provided with second mounting plates, two groups of the second mounting plates are close to each other, one side, far away from the placing frame, of each second mounting plate is provided with a second rotating shaft, the front end of the outer side of the second rotating shaft is provided with a driven gear, the middle position of the outer side of the second rotating shaft is provided with a pressing component, one side, near to the end, of each second mounting plate is provided with a through groove, one side, near the top of the front end, of one group of the second mounting plates is provided with a sliding groove, the inside of the two groups of the sliding grooves is provided with a driving motor in a sliding mode, the output end of the driving motor is provided with a supporting shaft, one end of the back of the supporting shaft penetrates through the inside of the two groups of the through grooves, one side, near to the second rotating shaft, of one group of the back of the second mounting plates is provided with a connecting plate, one side of the connecting plate is provided with a third spring, and one end of the back of the outer side of the supporting shaft is sleeved with a sleeve, and one end of the front surface of the outer side of the supporting shaft is sleeved with a driving gear.

Preferably, drive assembly includes slide bar, drive sleeve, drive gear, first spring, connecting rod and draw-in groove, the slide bar is provided with two sets ofly, and is two sets of the slide bar is located the inside of ring channel, and is two sets of the back one end of slide bar is provided with drive gear, the both sides of the positive one end of drive gear all are provided with first spring, and the outside of two sets of slide bars all overlaps and is equipped with the connecting rod, and is two sets of one side that the connecting rod is close to each other is provided with drive sleeve, drive sleeve's positive one end is provided with the draw-in groove

Preferably, the press-fit assembly includes a press-fit sleeve, an insertion rod, a press-fit groove, a press-fit block, an insertion groove, a sliding block, an arc-shaped sliding groove, a fixing rod, a containing groove, a second spring, and the press-fit sleeve is located outside the second rotating shaft, the press-fit groove is formed in the top of the press-fit sleeve, the press-fit block is sleeved inside the press-fit groove, the fixing groove is formed in one end of the back face of the top of the press-fit block, (one end of the back face of the inside is provided with the insertion groove, the arc-shaped sliding groove is formed in one end of the back face of one side of the press-fit sleeve, the sliding block is arranged inside the arc-shaped sliding groove in a sliding mode, the insertion rod is arranged on one side of the sliding block, the containing groove is formed in the top of the insertion rod, the second spring is arranged at the bottom of the containing groove, and the fixing rod is arranged at the top of the second spring.

Preferably, the cross sections of the annular groove and the sliding rod are T-shaped, and the annular groove is matched with the sliding rod in a sliding mode.

Preferably, the transmission gear is positioned inside the chain, and the transmission gear is meshed with the chain.

Preferably, the bottom and two sides in the pressing groove are provided with rubber pads.

Preferably, the top of the fixing rod penetrates through the inside of the fixing groove, and the top of one side of the fixing rod is obliquely arranged.

Preferably, the outside of driving motor is provided with the motor storehouse, and motor storehouse back one end top and bottom are provided with the slider, and slider and the mutual sliding adaptation of spout.

Preferably, the sleeve and the third spring are located at the same end, and the third spring and the sleeve are fixedly connected with each other.

Preferably, both sides of the interior of the pressing groove and both sides of the pressing block are obliquely arranged.

The invention has the beneficial effects that:

the invention provides a plastic film double-sided printing device, which has the following beneficial effects:

1. according to the invention, through the mutual matching of the first mounting plate, the transmission assembly, the first rotating shaft, the brush rollers, the first gear, the chain, the mounting through groove, the annular groove and the mounting groove, the force for driving the film rollers to rotate is taken as power through the movement of the plastic film, so that the two groups of brush rollers are driven to rotate, the double-sided wiping can be performed on the plastic film before the printing is performed, the cleanliness of the plastic film is improved, and the printing quality is improved;

2. according to the invention, by utilizing the mutual matching of all parts of the pressing component, one end of the film can be firmly fixed on the pressing sleeve when the film is collected, so that the film is prevented from being loosened when being rolled and collected, and the working efficiency is improved;

3. according to the invention, through the sliding groove, the through groove, the driving motor, the connecting plate, the third spring, the sleeve, the supporting shaft, the driving gear, the driven gear and the second rotating shaft, when the plastic film is quickly wound, the top of the supporting shaft can be opened through the wound plastic film, the supporting shaft moves in the through groove, the driving gear and the driven gear are mutually separated and the meshing state is released, so that the driven gear does not rotate, the pressing assembly does not continue to wind, and the winding thickness is accurately controlled.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a top cross-sectional view of the placement frame of the present invention;

FIG. 3 is a top cross-sectional view of the transmission assembly of the present invention;

FIG. 4 is a front view of the drive sleeve of the present invention

FIG. 5 is a top cross-sectional view of a second mounting plate of the present invention;

FIG. 6 is a front cross-sectional view of a second shaft of the present invention;

FIG. 7 is an enlarged view taken at A of FIG. 6 in accordance with the present invention;

fig. 8 is a perspective view of the present invention.

In the figure: 1. a base; 2. placing the frame; 3. a first mounting plate; 4. a transmission assembly; 401. a slide bar; 402. a drive sleeve; 403. a transmission gear; 404. a first spring; 405. a connecting rod; 406. a card slot; 5. a second mounting plate; 6. a chute; 7. a through groove; 8. a drive motor; 9. a first rotating shaft; 10. a brush roller; 11. a printing press; 12. a discharge port; 13. a first gear; 14. a chain; 15. installing a through groove; 16. an annular groove; 17. mounting grooves; 18. pressing the components; 1801. pressing the sleeve; 1802. inserting a rod; 1803. a pressing groove; 1804. pressing blocks; 1805. a slot; 1806. a slider; 1807. an arc-shaped chute; 1808. fixing grooves; 1809. fixing the rod; 1810. a receiving groove; 1811. a second spring; 19. a connecting plate; 20. a third spring; 21. a sleeve; 22. a support shaft; 23. a driving gear; 24. a driven gear; 25. a second rotating shaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1-8, the present invention provides a technical solution: a plastic film double-sided printing device comprises a base 1, a placing frame 2 is arranged on one side of the top of the base 1, an installing through groove 15 and an installing groove 17 are respectively arranged at the middle positions of two ends inside the placing frame 2, an annular groove 16 is arranged at the middle position of one end of the back of the placing frame 2, a transmission component 4 is arranged inside the annular groove 16 in a sliding mode, a discharging hole 12 is arranged at the middle position of one side of the placing frame 2, first installing plates 3 are arranged at two ends of one side, close to the discharging hole 12, of the placing frame 2, first rotating shafts 9 are arranged at the top and the bottom of one end, close to each other, of the two groups of first installing plates 3, hairbrush rollers 10 are sleeved on the outer sides of the two groups of first rotating shafts 9, one ends of the back of the two groups of first rotating shafts 9 penetrate through the inside of the first installing plates 3 and are provided with first gears 13, chains 14 are sleeved on the outer sides of the two groups of the first gears 13, a printing machine 11 is arranged at the middle position of the top of the base 1, the two ends of the base 1 far away from one side of the placing frame 2 are both provided with second mounting plates 5, one end of each group of second mounting plates 5 close to each other and far away from one side of the placing frame 2 is provided with a second rotating shaft 25, the front end of the outer side of the second rotating shaft 25 is provided with a driven gear 24, the middle position of the outer side of the second rotating shaft 25 is provided with a pressing component 18 which can fix the rolled film, one end of each group of second mounting plates 5 close to each other and far away from the second rotating shaft 25 is provided with a through groove 7, one side of the top of the front end of each group of second mounting plates 5 is provided with a sliding groove 6, the inside of each group of sliding grooves 6 is provided with a driving motor 8 in a sliding way, the output end of the driving motor 8 is provided with a supporting shaft 22, the back end of the supporting shaft 22 penetrates through the inside of each group of through grooves 7, one side of the back end of each group of the second mounting plates 5 close to the second rotating shaft 25 is provided with a connecting plate 19, and one side of the connecting plate 19 is provided with a third spring 20, the sleeve 21 is sleeved on one end of the back of the outer side of the supporting shaft 22, and the driving gear 23 is sleeved on one end of the front of the outer side of the supporting shaft 22.

As a preferable embodiment of the present embodiment: the transmission assembly 4 comprises two groups of sliding rods 401, transmission sleeves 402, transmission gears 403, first springs 404, connecting rods 405 and clamping grooves 406, the two groups of sliding rods 401 are located inside the annular groove 16, the transmission gears 403 are arranged at one ends of the back faces of the two groups of sliding rods 401, the first springs 404 are arranged on two sides of one end of the front face of each transmission gear 403, the connecting rods 405 are sleeved on the outer sides of the two groups of sliding rods 401, the transmission sleeves 402 are arranged on one sides, close to each other, of the two groups of connecting rods 405, the clamping grooves 406 are arranged at one ends of the front faces of the transmission sleeves 402, and the brush roller 10 can be rotated when a film is printed.

As a preferable embodiment of the present embodiment: the pressing component 18 comprises a pressing sleeve 1801, an insertion rod 1802, a pressing groove 1803, a pressing block 1804, a slot 1805, a sliding block 1806, an arc-shaped sliding groove 1807, a fixing groove 1808, a fixing rod 1809, a containing groove 1810, second springs 1811 and 1812, the pressing sleeve 1801 is located on the outer side of the second rotating shaft 25, the pressing groove 1803 is arranged at the top of the pressing sleeve 1801, the pressing block 1804 is sleeved inside the pressing groove 1803, the fixing groove 1808 is arranged at one end of the back of the top of the pressing block 1804, the slot 1805 is arranged at one end of the back of the 1804 inside 1804, the arc-shaped sliding groove 1807 is arranged at one end of the back of one side of the pressing sleeve 1801, the sliding block 1806 is arranged inside the arc-shaped sliding groove 1807 in a sliding mode, the insertion rod 1802 is arranged on one side of the sliding block 1806, the containing groove 1810 is arranged at the top of the insertion rod 1802, the second spring 1811 is arranged at the bottom of the containing groove 1810, the top of the second spring 1811 is provided with the fixing rod 1809, and a plastic film can be tightly pressed.

As a preferable embodiment of the present embodiment: the cross sections of the annular groove 16 and the sliding rod 401 are T-shaped, and the annular grooves 16 and 1401 are matched with each other in a sliding mode to prevent the sliding rod 401 from falling.

As a preferable embodiment of the present embodiment: the transmission gear 403 is located inside the chain 14, and the transmission gear 403 is meshed with the chain 14 to rotate the two sets of first gears 13.

As a preferable embodiment of the present embodiment: the bottom and the two sides inside the pressing groove 1803 are provided with rubber pads, so that the damage to the plastic film is reduced.

As a preferable embodiment of the present embodiment: the top of the fixing rod 1809 penetrates through the inside of the fixing groove 1808, and the top on one side of the fixing rod 1809 is obliquely arranged, so that the fixing rod 1809 can move downwards after receiving transverse force.

As a preferable embodiment of the present embodiment: the outside of driving motor 8 is provided with the motor storehouse, and motor storehouse back one end top and bottom are provided with the slider, and slider and 6 mutual sliding adaptation of spout, the driving motor 8's of being convenient for removal.

As a preferable embodiment of the present embodiment: the sleeve 21 and the third spring 20 are located at the same end, and the third spring 20 and the sleeve 21 are fixedly connected to each other so that the support shaft 22 can be restored.

As a preferable embodiment of the present embodiment: both sides of the interior of the pressing groove 1803 and both sides of the pressing block 1804 are obliquely arranged, so that the shearing stress to the film is reduced, and the film is prevented from being damaged.

Example 1, as shown in fig. 5 to 6, when winding is required, a plastic film is passed between two sets of brush rollers 10, printing is performed while passing through the inside of a printer 11, the other end of the plastic film is passed between a pressing groove 1803 and a pressing block 1804, then the pressing block 1804 is pressed downward, so that the pressing block 1804 presses the plastic film, then the insertion rod 1802 is pushed, so that the slider 1806 slides inside the arc-shaped sliding groove 1807, the insertion rod 1802 enters inside the insertion groove 1805, the inclined edge of the fixing rod 1809 contacts with the pressing block 1804, so that the fixing rod 1809 is retracted towards the inside of the receiving groove 1810, and moves with the insertion rod 1802, when the fixing rod 1809 moves to the fixing groove 1808, the fixing rod 1809 is pushed to the inside of the fixing groove 1808 by the elastic force of the second spring 1811, fixing of the pressing block 1804 is completed, and thus pressing and fixing of the plastic film is completed.

Embodiment 2, as shown in fig. 5, when the pressing sleeve 1801 rotates along with the second rotating shaft 25, when the plastic film is rolled to a certain thickness, the plastic film gradually contacts with the supporting shaft 22, and when the roll is larger, the plastic film pushes the supporting shaft 22 to slide along the inside of the through slot 7 and move away from the second rotating shaft 25, so that the supporting shaft 22 drives the driving gear 23 and the driven gear 24 to gradually move away from each other and release the meshed state, at this time, the driven gear 24 and the second rotating shaft 25 do not rotate any more, the pressing sleeve 1801 stops rolling, and at this time, the plastic film can be cut and replaced.

The working principle is as follows: before use, the device is powered on, an unprinted plastic film roller is placed inside the placing frame 2, two ends of the unprinted plastic film roller are aligned with the mounting groove 17 and the mounting through groove 15 to interact downwards, then the transmission sleeve 402 is pulled towards one end, the unprinted film roller is completely mounted inside the mounting through groove 15, then the transmission sleeve 402 is sleeved at one end of the roller, so that the transmission sleeve 402 and the roller can rotate synchronously, when the film roller is printed, the plastic film passes through two groups of brush rollers 10 to be printed inside the printing machine 11, the other end of the transmission sleeve passes through the pressing groove 1803 and the pressing block 1804, then the pressing block 1804 is pressed downwards, so that the pressing block 1804 presses the plastic film, then the inserting rod 1802 is pushed, so that the sliding block 1806 slides inside the arc-shaped sliding groove 1807, the inserting rod 1802 enters the inside of the slot 1805, the bevel edge of the fixing rod 1809 is contacted with the pressing block 1804, so that the fixing rod 1809 is retracted towards the inside of the receiving groove 1810 and continues to move along with the insertion rod 1802, when the fixing rod 1809 moves to the fixing groove 1808, at this time, under the elastic force of the second spring 1811, the fixing rod 1809 is pushed to the inside of the fixing groove 1808, so as to complete the fixing of the pressing block 1804, thereby completing the pressing and fixing of the plastic film, the driving motor 8 is turned on, so that the driving motor 8 rotates to drive the driving gear 23 to rotate, the driving gear 23 drives the second rotating shaft 25 to rotate through the driven gear 24, thereby driving the pressing sleeve 1801 to rotate for winding, at this time, the unprinted film roller rotates to drive the transmission sleeve 402 to rotate, the transmission sleeve 402 drives the transmission gear 403 to rotate through the cooperation between the sliding rod 401 and the connecting rod 405, the transmission gear 403 drives the two sets of the first gears 13 to rotate through the chain 14, thereby driving the two sets of the brush rollers 10 to rotate through the first rotating shaft 9 to wipe the plastic film, the pressfitting sleeve 1801 rotates when rolling along with second pivot 25, when rolling to certain thickness, plastic film gradually contacts with back shaft 22 this moment, let roll up more big time more, plastic film can promote back shaft 22 and slide and keep away from each other with second pivot 25 along the inside of logical groove 7, thereby back shaft 22 drives driving gear 23 and driven gear 24 and gradually keeps away from, and remove the state of meshing, driven gear 24 and second pivot 25 do not rotate again this moment, pressfitting sleeve 1801 stops the rolling, alright cut out and change plastic film this moment.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a plastic film double-sided printing device, includes base (1), its characterized in that: the brush roller is characterized in that a placing frame (2) is arranged on one side of the top of a base (1), an installing through groove (15) and an installing groove (17) are respectively arranged at the middle positions of two ends of the inside of the placing frame (2), an annular groove (16) is arranged at the middle position of one end of the back of the placing frame (2), a transmission component (4) is arranged in the annular groove (16) in a sliding mode, a discharging hole (12) is arranged at the middle position of one side of the placing frame (2), first installing plates (3) are arranged at two ends of one side, close to the discharging hole (12), of the placing frame (2), first rotating shafts (9) are arranged at the top and the bottom of one end, close to each other, of the two groups of first installing plates (3), brush rollers (10) are sleeved on the outer sides of the two groups of first rotating shafts (9), one end of the back of the two groups of first rotating shafts (9) penetrates through the inside of the first installing plates (3) and is provided with a first gear (13), chains (14) are sleeved on the outer sides of the two groups of first gears (13), a printing machine (11) is arranged at the middle position of the top of the base (1), second mounting plates (5) are arranged on the two ends of the base (1) far away from the placing frame (2), second rotating shafts (25) are arranged on the two groups of second mounting plates (5) close to one end of each other and far away from the placing frame (2), driven gears (24) are arranged at the front ends of the outer sides of the second rotating shafts (25), a pressing component (18) is arranged at the middle position of the outer sides of the second rotating shafts (25), through grooves (7) are arranged on the two groups of second mounting plates (5) close to one end of each other and far away from the second rotating shafts (25), sliding grooves (6) are arranged on one side of the top of the front end of one group of the second mounting plates (5), and driving motors (8) are arranged inside the two groups of sliding grooves (6) in a sliding mode, the output of driving motor (8) is provided with back shaft (22), the inside of two sets of logical grooves (7) is run through to the back one end of back shaft (22), and is a set of one side that second mounting panel (5) back one end is close to second pivot (25) is provided with connecting plate (19), one side of connecting plate (19) is provided with third spring (20), the back pot head in back shaft (22) outside is equipped with sleeve (21), the positive pot head in back shaft (22) outside is equipped with driving gear (23).

2. A plastic film duplex printing apparatus according to claim 1 wherein: the transmission assembly (4) comprises a sliding rod (401), a transmission sleeve (402), a transmission gear (403), a first spring (404), a connecting rod (405) and a clamping groove (406), the sliding rod (401) is provided with two groups, the sliding rod (401) is located inside an annular groove (16) and is two groups, one end of the back face of the sliding rod (401) is provided with the transmission gear (403), the two sides of the front end of the transmission gear (403) are provided with the first spring (404), the outer sides of the two groups of the sliding rods (401) are both provided with the connecting rod (405) in a sleeved mode, the two groups of the connecting rod (405) are arranged on one side close to each other and are provided with the transmission sleeve (402), and the clamping groove (406) is arranged at one end of the front face of the transmission sleeve (402).

3. A plastic film duplex printing apparatus according to claim 1 wherein: the pressing component (18) comprises a pressing sleeve (1801), an insert rod (1802), a pressing groove (1803), a pressing block (1804), an inserting groove (1805), a sliding block (1806), an arc-shaped sliding groove (1807), a fixing groove (1808), a fixing rod (1809), a containing groove (1810), a second spring (1811) and a second spring (1812), wherein the pressing sleeve (1801) is located on the outer side of the second rotating shaft (25), the top of the pressing sleeve (1801) is provided with the pressing groove (1803), the pressing block (1804) is sleeved in the pressing groove (1803), one end of the back of the top of the pressing block (1804) is provided with the fixing groove (1808), one end of the back of the inside of the (1804) is provided with the inserting groove (1805), one end of the back of one side of the pressing sleeve (1801) is provided with the arc-shaped sliding groove (1807), a sliding block (1806) is arranged in the arc-shaped sliding groove (1807), one side of the sliding block (1806) is provided with the insert rod (1802), the top of the inserted bar (1802) is provided with a receiving groove (1810), the bottom inside the receiving groove (1810) is provided with a second spring (1811), and the top of the second spring (1811) is provided with a fixing bar (1809).

4. A plastic film duplex printing apparatus according to claim 1 wherein: the cross sections of the annular grooves (16) and (1401) are T-shaped, and the annular grooves (16) and the sliding rods (401) are matched with each other in a sliding mode.

5. A plastic film duplex printing apparatus according to claim 2 wherein: the transmission gear (403) is positioned inside the chain (14), and the transmission gear (403) is meshed with the chain (14).

6. A plastic film duplex printing apparatus according to claim 3 wherein: rubber pads are arranged at the bottom and two sides inside the pressing groove (1803).

7. A plastic film duplex printing apparatus according to claim 3 wherein: the top of dead lever (1809) runs through the inside of fixed slot (1808), the top of dead lever (1809) one side is the slope setting.

8. A plastic film duplex printing apparatus according to claim 1 wherein: the outside of driving motor (8) is provided with the motor storehouse, and motor storehouse back one end top and bottom are provided with the slider, and slider and spout (6) mutual slip adaptation.

9. A plastic film duplex printing apparatus according to claim 1 wherein: the sleeve (21) and the third spring (20) are positioned at the same end, and the third spring (20) and the sleeve (21) are fixedly connected with each other.

10. A plastic film duplex printing apparatus according to claim 3 wherein: the two sides inside the pressing groove (1803) and the two sides of the pressing block (1804) are obliquely arranged.