A film feeding device for UV inkjet printer

Abstract

The invention belongs to the technical field of inkjet printing, and particularly relates to a film feeding device for a UV inkjet printer, comprising a bottom plate frame, a printer housing is fixed above the bottom plate frame, an inkjet printing mechanism is slidably installed in the printer housing, a film paper inlet is opened on the left wall of the printer housing, and a film paper outlet is opened on the right wall, a film paper conveyor belt is symmetrically arranged up and down inside the printer housing, and the film paper conveyor belt is located on the left side of the inkjet printing mechanism, the upper and lower film paper conveyor belts are symmetrically arranged at the film paper inlet, and a support conveying port is formed between the upper and lower film paper conveyor belts, and the upper and lower symmetrical film paper conveyor belts are rotatably installed in the printer housing by adjusting a transmission component; the invention can prevent the film material fed into the printer housing from being loosened or being conveyed unstably when being conveyed to the bottom of the inkjet printing mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of inkjet printing, and in particular relates to a film feeding device for a UV inkjet printer. Background Art

[0002] Printers are a common printing device, and there are many types, such as pinhole printers, inkjet printers, etc. Inkjet printers are the most widely used type on the market. This type of printer can not only print on paper materials, but also on cloth or film materials.

[0003] When the existing UV inkjet printer performs inkjet printing on film materials, the film material needs to be fed into the printer housing first, and then the inkjet printing mechanism performs printing processing. The existing UV inkjet printer mostly provides an external conveying component on the outside of the printer housing for feeding the film into the printer housing. Since there is still a distance between the film feeding port and the inkjet printing mechanism, if a simple conveying roller is used to convey the fed film to the bottom of the inkjet printing mechanism, it is easy to cause the fed film to become loose or the conveying to be unstable, which not only affects the quality of inkjet printing of the conveyed film by the inkjet printing mechanism, but also easily causes damage to the UV inkjet printer. Summary of the invention

[0004] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention discloses a film feeding device for a UV inkjet printer, comprising a bottom plate frame, a printer housing is fixed above the bottom plate frame, an inkjet printing mechanism is slidably installed in the printer housing, a film paper inlet is provided on the left side wall of the printer housing, and a film paper outlet is provided on the right side wall of the printer housing, a film paper conveyor belt is symmetrically arranged in the printer housing, and the film paper conveyor belt is located on the left side of the inkjet printing mechanism, two upper and lower film paper conveyor belts are symmetrically arranged at the film paper inlet, and a support conveying port is formed between the two upper and lower film paper conveyor belts, and the upper and lower symmetrical film paper conveyor belts are rotatably installed in the printer housing by adjusting a transmission component.

[0006] Furthermore, the adjustment transmission assembly includes side vertical plates, rotating shafts, belt transmission assemblies and conveying rollers. Side vertical plates are provided on the front and rear sides of the upper and lower symmetrical film paper conveyor belts, and the height of the side vertical plates is greater than the distance between the outermost surfaces of the upper and lower film paper conveyor belts. Each of the side vertical plates is rotatably mounted with upper and lower groups of rotating shafts through bearings, and each group of rotating shafts is provided with at least three, and the outer ends of each group of three rotating shafts are connected for transmission through the belt transmission assembly. At least three conveying rollers are rotatably arranged in the film paper conveyor belt, and the two ends of each conveying roller are respectively connected to two rotating shafts symmetrically on the same axis.

[0007] Furthermore, the adjustment transmission assembly also includes a transmission screw, a bar slider, a suspension block and a guide slide. The printer housing is symmetrically and rotatably installed with a double-rotation transmission screw near the upper and lower inner walls, and each double-rotation transmission screw is symmetrically sleeved with a bar slider through a screw nut. The two upper and lower symmetrical bar sliders are connected to the side vertical plates through at least two suspension blocks. At least two guide slides are fixed to the upper and lower inner walls of the printer housing along the front and rear length directions, and the guide slides are connected to the bar sliders. The film paper conveyor belt is made of elastic rubber material, and the two side walls of the elastic rubber film paper conveyor belt are rotatably connected to the side vertical plates, and the conveying roller is made of a telescopic structure.

[0008] Furthermore, an annular groove is provided on the side surface of the side vertical plate corresponding to the film paper conveyor belt, and a limiting groove is provided at the bottom of the annular groove, the groove width of the limiting groove is greater than the width of the annular groove, and the cross-section formed between the annular groove and the limiting groove is a T-shaped structure, the front and rear end surfaces of the film paper conveyor belt made of elastic rubber material are inserted into the annular groove, and the front and rear end surfaces of the film paper conveyor belt are fixed with limiting slip rings, and the limiting slip rings are rotatably set in the limiting groove, and the projection shape of the annular groove and the limiting groove is the same as the projection shape of the film paper conveyor belt.

[0009] Furthermore, the conveying roller of the telescopic structure includes a transmission cylinder, a blocking block, a sliding rod, a sliding strip and a circular positioning block, a circular blocking block is fixed at the inner center of the transmission cylinder, and a plurality of sliding slots are opened at the center of the two end pipe openings of the transmission cylinder, and a plurality of sliding slots are opened in a circular array on the transmission cylinder, sliding rods are symmetrically slidably inserted in the two end pipe openings of the transmission cylinder, and a plurality of sliding strips are fixed in a circular array on the outer ring surface of the sliding rod, each of the sliding strips is slidably inserted into each sliding slot, and the outer ring surfaces of the plurality of sliding strips are flush with the outer ring surface of the transmission cylinder, a circular positioning block is fixed to the outermost end of the sliding rod, and the diameter of the circular positioning block is the same as the diameter of the transmission cylinder, and the circular positioning block is connected to the rotating shaft.

[0010] Furthermore, the surface of the film paper conveyor belt is a rough surface, and the surface of the film paper conveyor belt is provided with an antistatic layer.

[0011] Furthermore, a plurality of groups of vertically symmetrical traction rollers are arranged on one side of the film paper outlet inside the printer housing, support frames are vertically fixed to the left and right outer sides of the printer housing, and conveying support rollers are symmetrically installed to rotate vertically between the support frames.

[0012] Furthermore, a support base is fixed on the upper surface of the bottom plate frame, and the support base is located on the left side of the printer housing, and the support base is used to rotatably support the film material to be printed and rolled up.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention arranges a vertically symmetrical film paper conveyor belt inside the printer housing and on the left side of the inkjet printing mechanism. The film material fed into the film paper inlet will enter the support conveying port, and then the film paper conveyor belt rotating up and down will accurately and stably feed the film material to the bottom of the inkjet printing mechanism. At the same time, the vertically symmetrical film paper conveyor belt can not only convey the film material, but also press and support the film material, thereby preventing the film material fed into the printer housing from becoming loose or being conveyed unstably when being conveyed to the bottom of the inkjet printing mechanism. This can not only improve the UV inkjet printer's ability to perform high-quality inkjet printing on the stably supported and conveyed film material, but also prevent damage to the UV inkjet printer.

[0015] 2. The present invention sets the conveying roller into a telescopic structure, and multiple sliding strips are slidably inserted into the sliding slots, and the outer ring surface of the sliding strips is flush with the outer ring surface of the transmission cylinder. Therefore, the rotating shaft cannot drive the transmission cylinder to rotate through the sliding rods and the sliding strips. At the same time, the outer ring surfaces of the multiple sliding rods will always be in contact with the inner ring surface of the film paper conveyor belt, and the film paper conveyor belt extending into the annular groove will drive the limiting slip ring to rotate in an annular manner in the limiting groove. Since the cross-section of the limiting groove 512 and the annular groove is a T-shaped structure, the film paper conveyor belt can stably and safely convey the film material under the drive of multiple conveying rollers, and can also expand or contract under the sliding of the symmetrical side plates, so that the conveying rollers, whether contracted or extended, can stably and safely drive the film paper conveyor belt to rotate, and will not affect the normal contraction and extension of the conveying rollers.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 It is a schematic diagram of the overall structure disclosed in the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of the printer housing disclosed in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the adjustment transmission assembly disclosed in the present invention;

[0021] Figure 4 A cross-sectional view of a printer housing disclosed in the present invention;

[0022] Figure 5 It is a cross-sectional view of the film paper conveyor belt disclosed in the present invention;

[0023] Figure 6 It is a schematic structural diagram of the conveying roller disclosed in the present invention;

[0024] Figure 7 It is a schematic structural diagram of the side standing plate disclosed in the present invention.

[0025] In the figure: 1. bottom plate frame; 2. printer housing; 21. film paper inlet; 22. film paper outlet; 3. inkjet printing mechanism; 4. film paper conveyor belt; 41. support conveying port; 42. limit slip ring; 5. adjustment transmission assembly; 51. side plate; 511. annular groove; 512. limit groove; 52. rotating shaft; 53. belt transmission assembly; 54. transmission screw; 55. bar slider; 56. suspension block; 57. guide slider; 6. transmission roller; 61. transmission cylinder; 611. sliding slot; 62. blocking block; 63. sliding rod; 64. sliding strip; 65. circular positioning block; 7. traction roller; 8. support frame; 9. transmission support roller; 10. support seat. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] See also Figure 1-Figure 7As shown, the present invention is a film feeding device for a UV inkjet printer, comprising a bottom frame 1, a printer housing 2 is fixed above the bottom frame 1, and an inkjet printing mechanism 3 is slidably installed in the printer housing 2, a film paper inlet 21 is opened on the left wall of the printer housing 2, and a film paper outlet 22 is opened on the right wall thereof, a film paper conveyor belt 4 is symmetrically arranged in the upper and lower parts of the printer housing 2, and the film paper conveyor belt 4 is located on the left side of the inkjet printing mechanism 3, the upper and lower two film paper conveyor belts 4 are symmetrically arranged at the film paper inlet 21, and a support conveying port 41 is formed between the upper and lower two film paper conveyor belts 4, and the upper and lower symmetrical film paper conveyor belts 4 are rotatably installed in the printer housing 2 by adjusting the transmission assembly 5;

[0029] In the scheme designed by the present invention, therefore, when it is necessary to use a UV inkjet printer to perform inkjet printing on a film material, the operator first fixes the film to be printed and rolled up above the bottom frame and on the left side of the printer housing 2, and then drives the upper and lower symmetrical film paper conveyor belts 4 to operate by adjusting the transmission component 5, so that the upper and lower symmetrical film paper conveyor belts 4 can both rotate toward the direction of the inkjet printing mechanism 3, and then the operator first feeds the free end of the film material into the printer housing 2 through the film paper inlet 21, and since the support conveying port 41 formed between the upper and lower symmetrical film paper conveyor belts 4 is aligned with the film paper inlet 21, the film material fed into the film paper inlet 21 will enter the support conveying port 41, and then the upper The downward rotating film paper conveyor belt 4 will feed the film material accurately and stably to the bottom of the inkjet printing mechanism 3. At the same time, the upper and lower symmetrical film paper conveyor belt 4 can not only convey the film material, but also press and support the film material, thereby preventing the film material fed into the printer housing 2 from becoming loose or being conveyed unstably when being conveyed to the bottom of the inkjet printing mechanism 3. This can not only improve the UV inkjet printer's high-quality inkjet printing of the stably supported and conveyed film material, but also will not cause damage to the UV inkjet printer. The film printed by the inkjet printing mechanism 3 will be discharged from the outside of the printer housing 2 through the film paper outlet 22, and then collected and discharged through the winding mechanism or conveying mechanism on one side.

[0030] As an embodiment of the present invention, the adjustment transmission assembly 5 includes a side vertical plate 51, a rotating shaft 52, a belt transmission assembly 53 and a conveying roller 6. The front and rear sides of the upper and lower symmetrical film paper conveyor belt 4 are provided with side vertical plates 51, and the height of the side vertical plates 51 is greater than the distance between the outermost surfaces of the upper and lower film paper conveyor belts 4. Each of the side vertical plates 51 is rotatably mounted with upper and lower groups of rotating shafts 52 through bearings, and each group of rotating shafts 52 is provided with at least three, and the outer ends of each group of three rotating shafts 52 are connected by the belt transmission assembly 53 for transmission. At least three conveying rollers 6 are rotatably arranged in the film paper conveyor belt 4, and the two ends of each conveying roller 6 are respectively connected to two rotating shafts 52 symmetrically on the same axis;

[0031] In the scheme designed in the present invention, when the film paper conveyor belt 4 needs to rotate synchronously symmetrically up and down, the two servo motors fixed on the outer side of the side vertical plate 51 on the rear side are controlled to rotate, so that the conveying roller 6 is driven to rotate through the rotating shaft 52. Since at least three rotating shafts 52 are connected through the belt drive assembly 53, the three conveying rollers 6 in the film paper conveyor belt 4 will rotate synchronously, and then the upper film paper conveyor belt 4 will rotate counterclockwise, while the lower film paper conveyor belt 4 will rotate clockwise, so that the film material fed into the film paper inlet 21 can be stably and safely conveyed to the bottom of the inkjet printing mechanism 3, and high-quality inkjet printing can be performed on the film material.

[0032] As an embodiment of the present invention, the adjustment transmission assembly 5 also includes a transmission screw 54, a bar slider 55, a suspension block 56 and a guide slide 57. The printer housing 2 is symmetrically rotatably installed with a double-rotation transmission screw 54 near the upper and lower inner walls, and each double-rotation transmission screw 54 is symmetrically sleeved with a bar slider 55 through a screw nut. The two upper and lower symmetrical bar sliders 55 are connected to the side vertical plate 51 through at least two suspension blocks 56. The upper and lower inner walls of the printer housing 2 are fixed with at least two guide slides 57 along the front and rear length directions, and the guide slides 57 are connected to the bar slider 55. The film paper conveyor belt 4 is made of elastic rubber material, and the two side walls of the elastic rubber film paper conveyor belt 4 are rotatably connected to the side vertical plate 51, and the conveying roller 6 is made of a telescopic structure;

[0033] In the scheme designed by the present invention, when it is necessary to support and convey the film materials of different widths fed in, the control system of the UV inkjet printer can control the servo motor on the rear side of the printer housing 2 according to the width of the film material to be printed, so that it drives the upper and lower double-rotation transmission screws 54 to rotate synchronously, so that the two symmetrical bar sliders 55 on the same transmission screw 54 will drive the symmetrical side plates 51 to slide closer to or away from each other through the suspension block 56. If the symmetrical side plates 51 slide closer to each other, they will push the upper and lower groups of three telescopic conveying rollers 6 to shrink synchronously, and at the same time, the film paper conveyor belt 4 of the elastic rubber material will shrink, thereby reducing the width of the upper and lower symmetrical film paper conveyor belt 4, so that the film paper conveyor belt 4 can stably support and convey the narrower film material, and prevent the film material fed through the film paper inlet 21 from being narrow, causing the wider film paper conveyor belt 4 to convey the narrower film material, causing the film material to be skewed on the film paper conveyor belt 4, which will further affect the quality and accuracy of inkjet printing of the film material.

[0034] As an embodiment of the present invention, an annular groove 511 is provided on the side of the side vertical plate 51 corresponding to the film paper conveyor belt 4, and a limiting groove 512 is provided at the bottom of the annular groove 511, the groove width of the limiting groove 512 is greater than the width of the annular groove 511, and the cross-section formed between the annular groove 511 and the limiting groove 512 is a T-shaped structure, the front and rear end surfaces of the film paper conveyor belt 4 made of elastic rubber material are inserted into the annular groove 511, and the front and rear end surfaces of the film paper conveyor belt 4 are fixed with a limiting slip ring 42, and the limiting slip ring 42 is rotatably set in the limiting groove 512, and the projection shape of the annular groove 511 and the limiting groove 512 is the same as the projection shape of the film paper conveyor belt 4;

[0035] In the scheme designed by the present invention, when the symmetrical side plates 51 slide away from each other, the limit slip ring 42 rotatably installed in the limit groove 512 will pull the film paper conveyor belt 4 of the elastic rubber material to expand, so that the width of the film paper conveyor belt 4 symmetrically increased synchronously, so that the film paper conveyor belt 4 symmetrically increased can stably convey the wider film material to the bottom of the inkjet printing mechanism 3, and when the symmetrical side plates 51 are close to each other, the width of the film paper conveyor belt 4 of the elastic rubber material will shrink, thereby reducing the film paper conveyor belt 4. The belt 4 can stably transmit the film material with a smaller width; and when the multiple telescopic conveying rollers 6 drive the expanded or contracted film paper conveyor belt 4 to rotate, the film paper conveyor belt 4 extended into the annular groove 511 will drive the limiting slip ring 42 to rotate in a circle in the limiting groove 512, and because the cross-sections of the limiting groove 512 and the annular groove 511 are T-shaped structures, the film paper conveyor belt 4 can stably and safely transmit the film material under the drive of multiple conveying rollers 6, and at the same time can expand or contract under the sliding of the symmetrical side plates 51.

[0036] As an embodiment of the present invention, the conveying roller 6 of the telescopic structure includes a transmission cylinder 61, a blocking block 62, a sliding rod 63, a sliding strip 64 and a circular positioning block 65. A circular blocking block 62 is fixed at the inner center of the transmission cylinder 61, and a plurality of sliding slots 611 are opened at the center of the two end pipe openings of the transmission cylinder 61, and a plurality of sliding slots 611 are arranged in a circular array on the transmission cylinder 61. Sliding rods 63 are symmetrically slidably inserted in the two end pipe openings of the transmission cylinder 61, and a plurality of sliding strips 64 are fixed in a circular array on the outer ring surface of the sliding rod 63. Each of the sliding strips 64 is slidably inserted into each sliding slot 611, and the outer ring surfaces of the plurality of sliding strips 64 are flush with the outer ring surface of the transmission cylinder 61. A circular positioning block 65 is fixed at the outermost end of the sliding rod 63, and the diameter of the circular positioning block 65 is the same as the diameter of the transmission cylinder 61, and the circular positioning block 65 is connected to the rotating shaft 52.

[0037] In the scheme designed by the present invention, when the symmetrical side vertical plates 51 slide close to each other, the symmetrical side vertical plates 51 will push the sliding rod 63 to be synchronously inserted into the transmission cylinder 61 through the circular positioning block 65, and at the same time, multiple sliding strips 64 will slide and insert into multiple sliding slots 611, so that the length of the entire conveying roller 6 can be contracted, so that the contracted conveying roller 6 can drive the contracted film paper conveyor belt 4 to operate and support the film material; when the symmetrical side vertical plates 51 slide away from each other, the sliding rod 63 will be pulled out of the transmission cylinder 61, and the sliding strip 64 will slide outward from the sliding slot 611, The easily extended conveying roller 6 can drive the expanded film paper conveying belt 4 to operate and support the conveying of the film material; and multiple sliding strips 64 are slidably inserted into the sliding slots 611, and the outer ring surface of the sliding strips 64 is flush with the outer ring surface of the transmission cylinder 61. Therefore, the rotating shaft 52 cannot drive the transmission cylinder 61 to rotate through the sliding rods 63 and the sliding strips 64. At the same time, the outer ring surfaces of the multiple sliding rods 63 will always be in contact with the inner ring surface of the film paper conveying belt 4, so that the conveying roller 6 can stably and safely drive the film paper conveying belt 4 to rotate regardless of whether it is contracted or extended, and it will not affect the normal contraction and extension of the conveying roller 6.

[0038] As an embodiment of the present invention, the surface of the film paper conveyor belt 4 is a rough surface, and the surface of the film paper conveyor belt 4 has an antistatic layer; the rough surface of the film paper conveyor belt 4 can increase the conveying friction force on the film material, so that the film paper conveyor belt 4 can efficiently and accurately support and convey the film material; and the antistatic layer on the surface can prevent static electricity from being generated on the surface of the film material when the rubber material film paper conveyor belt 4 frictionally conveys the film material, thereby affecting the inkjet printing quality of the film material.

[0039] As an embodiment of the present invention, a plurality of groups of symmetrical traction rollers 7 are arranged on one side of the film paper outlet 22 inside the printer housing 2, support frames 8 are vertically fixed to the left and right outer sides of the printer housing 2, and conveying support rollers 9 are symmetrically installed between the support frames 8 for vertical rotation; in the scheme designed by the present invention, when the film material needs to be inkjet printed, the free end of the film material will first enter the conveying support roller 9 on the side of the film paper inlet 21 to support and convey the film material, and when the film material is completed by inkjet printing, the symmetrical traction rollers 7 located on the right side of the inkjet printing mechanism 3 will convey the printed film material to the film paper outlet 22, and then convey it through the conveying support roller 9 on the outside of the film paper outlet 22.

[0040] As an embodiment of the present invention, a support base 10 is fixed to the upper surface of the base frame 1, and the support base 10 is located on the left side of the printer housing 2. The support base 10 is used to rotatably support the film material to be printed and rolled up.

[0041] Working principle:

[0042] When it is necessary to use a UV inkjet printer to perform inkjet printing on film materials, the operator first fixes the film to be printed and rolled up above the bottom frame and on the left side of the printer housing 2, and controls the two servo motors fixed on the outer side of the side vertical plate 51 on the rear side to rotate, so that the two servo motors 52 drive the conveyor roller 6 to rotate, and since at least three rotating shafts 52 are connected through the belt drive assembly 53, the three conveyor rollers 6 in the film paper conveyor belt 4 will rotate synchronously, thereby causing the upper film paper conveyor belt 4 to rotate counterclockwise, while the lower film paper conveyor belt 4 rotates clockwise, and then the free end of the film material will first enter the conveyor support roller 9 on the side of the film paper inlet 21 to support the film material. The support conveying port 41 formed between the upper and lower symmetrical film paper conveyor belts 4 is aligned with the film paper inlet 21. Therefore, the film material fed into the film paper inlet 21 will enter the support conveying port 41, and then the film paper conveyor belt 4 rotating up and down will feed the film material accurately and stably to the bottom of the inkjet printing mechanism 3. At the same time, the upper and lower symmetrical film paper conveyor belts 4 can not only convey the film material, but also press and support the film material. When the film material is inkjet printed, the upper and lower symmetrical traction rollers 7 located on the right side of the inkjet printing mechanism 3 will convey the printed film material to the film paper outlet 22, and then convey it through the conveying support rollers 9 outside the film paper outlet 22.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A film feeding device for a UV inkjet printer, comprising a bottom plate frame (1), characterized in that: A printer housing (2) is fixed above the bottom frame (1), and an inkjet printing mechanism (3) is slidably installed in the printer housing (2); a film paper inlet (21) is provided on the left side wall of the printer housing (2), and a film paper outlet (22) is provided on the right side wall; a film paper conveyor belt (4) is symmetrically arranged in the upper and lower parts of the printer housing (2), and the film paper conveyor belt (4) is located on the left side of the inkjet printing mechanism (3); the upper and lower film paper conveyor belts (4) are symmetrically arranged at the film paper inlet (21), and a support conveying port (41) is formed between the upper and lower film paper conveyor belts (4); the upper and lower symmetrical film paper conveyor belts (4) are rotatably installed in the printer housing (2) by adjusting the transmission assembly (5); Wherein, the adjusting transmission assembly (5) comprises a side vertical plate (51), a rotating shaft (52), a belt transmission assembly (53) and a conveying roller (6); the front and rear sides of the upper and lower symmetrical film paper conveying belt (4) are both provided with a side vertical plate (51), and the height of the side vertical plate (51) is greater than the distance between the outermost surfaces of the upper and lower film paper conveying belts (4); each of the side vertical plates (51) is rotatably mounted with two groups of upper and lower rotating shafts (52) through bearings, and each group of rotating shafts (52) is provided with at least three, and the outer ends of each group of three rotating shafts (52) are connected for transmission through the belt transmission assembly (53); at least three conveying rollers (6) are rotatably arranged inside the film paper conveying belt (4), and the two ends of each conveying roller (6) are respectively connected to two rotating shafts (52) symmetrically arranged on the same axis; The conveying roller (6) is made of a telescopic structure, and the conveying roller (6) of the telescopic structure comprises a transmission cylinder (61), a blocking block (62), a sliding insertion rod (63), a sliding insertion strip (64) and a circular positioning block (65). A circular blocking block (62) is fixed at the inner center of the transmission cylinder (61), and a plurality of sliding slots (611) are opened at the center of the two end pipe openings of the transmission cylinder (61), and the plurality of sliding slots (611) are arranged in a circular array on the transmission cylinder (61). A sliding plug-in is provided, and a plurality of sliding insert strips (64) are fixed in a circular array on the outer ring surface of the sliding plug rod (63). Each of the sliding insert strips (64) is slidably inserted into each sliding slot (611). The outer ring surfaces of the plurality of sliding insert strips (64) are flush with the outer ring surface of the transmission cylinder (61). A circular positioning block (65) is fixed to the outermost end of the sliding plug rod (63). The diameter of the circular positioning block (65) is the same as the diameter of the transmission cylinder (61). The circular positioning block (65) is connected to the rotating shaft (52).

2. A film feeding device for a UV inkjet printer according to claim 1, characterized in that: The adjusting transmission assembly (5) also includes a transmission screw (54), a strip slider (55), a suspension block (56) and a guide slide (57). The printer housing (2) is symmetrically rotatably mounted with a double-rotation transmission screw (54) near the upper and lower inner walls, and each double-rotation transmission screw (54) is symmetrically sleeved with a strip slider (55) through a screw nut. The two upper and lower symmetrical strip sliders (55) are connected to the side vertical plate (51) through at least two suspension blocks (56). The upper and lower inner walls of the printer housing (2) are fixed with at least two guide slides (57) along the front and rear length directions, and the guide slides (57) are connected to the strip slider (55). The film paper conveyor belt (4) is made of elastic rubber material, and the two side walls of the elastic rubber film paper conveyor belt (4) are rotatably connected to the side vertical plate (51).

3. A film feeding device for a UV inkjet printer according to claim 2, characterized in that: The side surface of the side vertical plate (51) corresponding to the film paper conveyor belt (4) is provided with an annular groove (511), and the bottom of the annular groove (511) is provided with a limiting groove (512), the groove width of the limiting groove (512) is greater than the width of the annular groove (511), and the cross-section formed between the annular groove (511) and the limiting groove (512) is a T-shaped structure, the front and rear end surfaces of the film paper conveyor belt (4) made of elastic rubber material are inserted into the annular groove (511), and the front and rear end surfaces of the film paper conveyor belt (4) are fixed with a limiting slip ring (42), and the limiting slip ring (42) is rotatably arranged in the limiting groove (512), and the projection shape of the annular groove (511) and the limiting groove (512) is the same as the projection shape of the film paper conveyor belt (4).

4. A film feeding device for a UV inkjet printer according to claim 1, characterized in that: The surface of the film paper conveyor belt (4) is a rough surface, and the surface of the film paper conveyor belt (4) is provided with an antistatic layer.

5. A film feeding device for a UV inkjet printer according to claim 1, characterized in that: A plurality of groups of symmetrical traction rollers (7) are arranged on one side of the film paper outlet (22) inside the printer housing (2), support frames (8) are vertically fixed to the left and right outer sides of the printer housing (2), and conveying support rollers (9) are symmetrically installed between the support frames (8) to rotate vertically.

6. A film feeding device for a UV inkjet printer according to claim 1, characterized in that: A support seat (10) is fixed on the upper surface of the base frame (1), and the support seat (10) is located on the left side of the printer housing (2). The support seat (10) is used to rotatably support the film material to be printed and rolled up.

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