Automatic paper feeding device for carton printing mechanism

Abstract

The present invention discloses an automatic paper feeding device of a paper box printing mechanism, comprising a printing machine and a bracket fixed on its outer side, an outer transmission belt is installed on the bracket for transmitting a sheet paper box, and a paper feeding unit is also installed on the bracket; the paper feeding unit comprises two outer frame plates fixed on the bracket, an outer frame plate is sleeved on the two outer frame plates, an inner driving part for transmitting the sheet paper box is installed between the two outer frame plates, and a single sheet separation part for separating stacked paper boxes is installed on the outer side of the outer frame plate; wherein the inner driving part pushes the sheet paper box into the single sheet separation part to separate the sheet paper box into single sheets. The present invention can make the lowest paper box receive a downward thrust by being pushed close to the separation shaft 1 and the separation shaft 2 and subjected to the outwardly inclined airflow, so as to achieve relative flattening, and can smoothly pass through the gap between the separation shaft 1 and the separation shaft 2 to avoid jamming.

Description

Technical Field

[0001] The invention relates to the technical field of printing transmission, in particular to an automatic paper feeding device of a paper box printing mechanism. Background Art

[0002] At present, the carton feeding equipment on the market has made certain technological progress. Modern carton feeding equipment has achieved a high level of automation, and can automatically complete the transportation, positioning, and adjustment of carton. Some equipment has also introduced intelligent systems, which realize real-time monitoring and adjustment of carton status through sensors, controllers and other components, improving the adaptability and production efficiency of the equipment. With the continuous advancement of manufacturing technology, the accuracy and stability of carton feeding equipment have been significantly improved. This helps to ensure the accurate positioning and stable transportation of carton during the printing process, thereby improving the printing quality. For different types and specifications of carton, there are a variety of feeding equipment available on the market. At the same time, some equipment can also be customized according to the actual needs of customers to meet specific production needs.

[0003] In the case of different paper in the paper box, although the dedicated paper feeding mechanism can realize the feeding of the stacked paper boxes as a single sheet to complete the printing, the edge of the paper box is easily bent and wrinkled by external force, which is easy to get stuck during the paper box transmission process, or it is difficult to achieve the feeding of a single sheet of paper, affecting the transmission of the paper box. In addition, due to the certain friction of the outer wall of the stacked paper boxes, it is more difficult to separate the sheet paper boxes, and it is easy to fail to feed paper continuously, which affects the printing efficiency. Summary of the invention

[0004] The object of the present invention is to provide an automatic paper feeding device for a carton printing mechanism to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic paper feeding device of a paper box printing mechanism, comprising a printing machine and a bracket fixed to the outside thereof, an external transmission belt is installed on the bracket for transmitting a sheet paper box, and a paper feeding unit is also installed on the bracket;

[0006] The paper feeding unit comprises two outer frame plates fixed on the bracket, the two outer frame plates are sleeved with outer frame plates, an inner driving part for conveying the sheet paper box is installed between the two outer frame plates, and a single sheet separation part for separating the stacked paper boxes is installed outside the outer frame plates;

[0007] The inner driving part pushes the sheet paper box into the single sheet separation part to separate the sheet paper box into single sheets.

[0008] Furthermore, the internal driving part includes a plurality of inner driving shafts arranged in an array, an inner conveyor belt is sleeved on the outer side of the plurality of inner driving shafts, and the plurality of inner driving shafts are rotatably installed between two outer frame plates. The two outer frame plates and the outer frame plates form a frame shape, the interior of which is used to stack paper boxes, and the paper boxes are supported on the upper end of the inner conveyor belt, and the outer walls of the paper boxes are respectively in contact with the outer frame plates and the outer frame plates.

[0009] Furthermore, the single sheet separation part includes two support plates fixed on the outside of the outer frame plate, and a separation shaft 1 and a separation shaft 2 are rotatably installed between the two support plates. The sides of the separation shaft 1 and the separation shaft 2 are connected to the inside of the outer frame plate, and the separation shaft 1 and the separation shaft 2 are arranged up and down. The outer ends of the separation shaft 1 and the separation shaft 2 are sleeved with a transmission belt for driving the two to rotate, and a transmission belt for driving the two to rotate is also sleeved between the separation shaft 2 and the closest inner drive shaft, and a transmission belt for driving the two to rotate is also sleeved between the two inner drive shafts that are farthest apart. A servo motor for driving the inner drive shaft to rotate is fixed to the outside of the outer frame plate.

[0010] Furthermore, the separation shaft 2 is in the same horizontal plane as the inner driving shaft, and a rubber layer is sleeved on the separation shaft 2 for increasing friction. The upper end surface of the rubber layer is flush with the upper end surface of the inner conveyor belt, and the gap between the rubber layer and the separation shaft 1 is only wide enough for a paper box to pass through.

[0011] Furthermore, a support frame plate for supporting the paper box is provided between the two outer frame plates. The support frame plate is located between the rubber layer and the inner conveyor belt, and the two sides of the support frame plate are respectively in contact with the rubber layer and the inner conveyor belt. The upper end surface height of the support frame plate is lower than the height of the rubber layer and the inner conveyor belt.

[0012] Furthermore, the two outer frame plates are penetrated by arc-shaped limiting openings, and rotating rods extending from the limiting openings are fixed at both ends of the support frame plate, and the ends of the rotating rods are provided with limiting sleeves, and the limiting sleeves are sleeved with the inner drive shaft at the end, so that the support frame plate can rotate in an arc shape along the axis of the inner drive shaft at the end;

[0013] The axis of the limit opening coincides with the axis of the inner driving shaft at the end, and when the support frame plate is horizontal, the rotating rod fits with one end of the limit opening.

[0014] Furthermore, the outer frame plate has an arc-shaped opening on one side thereof for conveying a single paper box, and the arc-shaped opening is in contact with the separation axis;

[0015] The interior of the separation shaft is hollow, and an inner shaft is fixed through the separation shaft from the outside to the inside. The interior of the inner shaft is hollow, and a through hole is passed through the outer side of the inner shaft. The inner shaft is used to transport gas into the separation shaft. The outer wall of the separation shaft is circumferentially distributed with oblique slits, and the oblique slits are used to blow the gas inside the separation shaft outward.

[0016] Furthermore, one end of the separation shaft is provided with an annular groove connected to the interior, and a blocking layer extending into the annular groove is fixed on one side of the support plate, and the blocking layer is in contact with the inner wall of the separation shaft to block the oblique slit. The blocking layer is in an arc shape protruding upward, and the oblique slit in the lower part is kept blown to make the paper box fit onto the rubber layer, thereby increasing the friction between the paper box and the rubber layer.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] 1. The paper box at the bottom is driven by the inner conveyor belt. Under the friction of the rubber layer and the inner conveyor belt, the paper box moves out from between the separation shaft 1 and the separation shaft 2. The separation shaft 1 rotates counterclockwise to block the remaining paper boxes and complete the single-sheet separation.

[0019] 2. An air pump is provided on the outside to blow air into the inner shaft, so that the gas moves out from the oblique slit. Under the obstruction of the barrier layer, the gas can only move toward the oblique slit at the lower end, and the airflow is inclined outward. The lowest carton is blown by the inclined airflow first, and the degree of squeezing between the carton and the rubber layer increases, thereby increasing the friction between the two and reducing the friction between the carton and the separation shaft 1. The lowest carton is subjected to a greater force from the rubber layer, making the separation smoother. The remaining carton will be blocked by the rotation of the separation shaft 1 to ensure single-sheet transmission.

[0020] 3. The paper box at the bottom is pushed close to the separation axis 1 and the separation axis 2, and is affected by the outward-slanting airflow, which can make the paper box at the bottom receive an oblique downward thrust, so that it can be relatively flattened and can smoothly pass through the gap between the separation axis 1 and the separation axis 2 to avoid jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of one side of the paper feeding unit of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the other side of the paper feeding unit of the present invention;

[0025] Figure 4 It is a schematic diagram of a half-section structure of a paper feeding unit of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a single sheet separation unit of the present invention;

[0027] Figure 6 It is a schematic diagram of a separation shaft-separation structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the separation axis one and the separation axis another according to the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the paper box stacking inside the single sheet separation part of the present invention;

[0030] Fig. 9 The present invention Figure 8 A is a schematic diagram of the partially enlarged structure of the middle part;

[0031] Fig.10 It is a schematic diagram of the structure of the outer frame plate and the inner driving part being separated in the present invention;

[0032] Fig.11 The present invention Fig.10 Schematic diagram of the partially enlarged structure of B.

[0033] In the figure: 1. printing press; 2. bracket; 3. external transmission belt; 4. paper feeding unit; 41. external frame plate; 42. internal driving part; 421. internal driving shaft; 422. internal transmission belt; 43. servo motor; 44. external frame plate; 441. arc-shaped pasting mouth; 45. single sheet separation part; 451. support plate; 452. separation shaft one; 401. oblique slit; 402. internal shaft; 403. through-hole; 404. annular groove; 405. baffle; 453. separation shaft two; 454. rubber layer; 46. support frame plate; 461. rotating rod; 462. limiting sleeve; 463. limiting mouth; 47. transmission belt. DETAILED DESCRIPTION

[0034] 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.

[0035] See also Figure 1-Figure 11The present invention provides a technical solution: although the dedicated paper feeding mechanism can realize the feeding of stacked paper boxes in single sheets, so as to complete printing, the edge of the paper box is easily bent and wrinkled by external force, which is easy to get stuck during the paper box transmission process, or it is difficult to realize the feeding of single sheets of paper, which affects the transmission of the paper box. Therefore, an automatic paper feeding device of a paper box printing mechanism is required, including a printing machine 1 and a bracket 2 fixed to the outside thereof, an external transmission belt 3 is installed on the bracket 2 for transmission, and is used to transmit the sheet paper box. A paper feeding unit 4 is also installed on the bracket 2, and the paper feeding unit 4 separates the stacked paper boxes into single sheets, moves them from the external transmission belt 3 to the printing machine 1 for printing, and completes the processing of the paper box;

[0036] like Figure 3 As shown, the paper feeding unit 4 includes two outer frame plates 41 fixed on the bracket 2, and the two outer frame plates 41 are sleeved with outer frame plates 44. An inner driving part 42 for conveying the sheet paper box is installed between the two outer frame plates 41, and a single sheet separation part 45 for separating the stacked paper boxes is installed outside the outer frame plate 44;

[0037] Among them, the internal driving part 42 pushes the sheet paper box into the single sheet separation part 45, separates the sheet paper box into single sheets, and is installed between the outer frame plate 44 and the outer frame plate 41 to form a frame shape inside. The stacked paper boxes are placed therein to complete the transmission of single sheets, and the number of stacked paper boxes gradually decreases. Subsequently, paper boxes can be continuously placed therein to complete the processing uninterruptedly without stopping.

[0038] like Figure 4 As shown, the internal driving part 42 includes a plurality of inner driving shafts 421 arranged in an array, and an inner conveying belt 422 is sleeved on the outer side of the plurality of inner driving shafts 421. The plurality of inner driving shafts 421 are rotatably installed between two outer frame plates 41. The lower end of the stacked paper boxes is driven by the moving inner conveying belt 422, so that the inner conveying belt 422 pushes the lowermost paper box laterally, so that the paper box moves toward the single sheet separation part 45. The two outer frame plates 41 and the outer frame plate 44 form a frame shape, the interior of which is used for stacking paper boxes, and the paper boxes are supported on the upper end of the inner conveying belt 422, and the outer walls of the paper boxes are respectively in contact with the outer frame plate 41 and the outer frame plate 44, so that the paper boxes remain in a neat state and the paper boxes are in the same direction after transmission.

[0039] like Figure 2 and Figure 5As shown, the single sheet separation part 45 includes two support plates 451 fixed on the outside of the outer frame plate 44, and a separation shaft 1 452 and a separation shaft 2 453 are rotatably installed between the two support plates 451. The sides of the separation shaft 1 452 and the separation shaft 2 453 are connected to the inside of the outer frame plate 44. The separation shaft 1 452 and the separation shaft 2 453 are arranged up and down. The outer ends of the separation shaft 1 452 and the separation shaft 2 453 are sleeved with a transmission belt 47 for driving the two to rotate. The separation shaft 2 453 is closest to the inner drive shaft 42 1 is also sleeved with a transmission belt 47 for driving the two to rotate, and a transmission belt 47 for driving the two to rotate is also sleeved between the two inner drive shafts 421 that are farthest apart. A servo motor 43 for driving the inner drive shaft 421 to rotate is fixed to the outer side of the outer frame plate 41, so that the inner transmission belt 422, the separation shaft 1 452 and the separation shaft 2 453 rotate in the same direction, wherein the inner transmission belt 422 and the separation shaft 2 453 transmit the lowest paper box, and the separation shaft 1 452 blocks the remaining paper boxes.

[0040] like Figure 5 As shown, the separation shaft 453 and the inner driving shaft 421 are in the same horizontal plane. A rubber layer 454 is sleeved on the separation shaft 453 to increase friction. The upper end surface of the rubber layer 454 is flush with the upper end surface of the inner conveyor belt 422. The gap between the rubber layer 454 and the separation shaft 452 is only wide enough for one paper box to pass through, so as to avoid jamming and ensure the transmission of the paper box. The rubber layer 454 can also increase the friction against the paper box.

[0041] like Figure 5 As shown, a support frame plate 46 for supporting a paper box is provided between the two outer frame plates 41, and the support frame plate 46 is located between the rubber layer 454 and the inner conveyor belt 422, and the two sides of the support frame plate 46 are respectively in contact with the rubber layer 454 and the inner conveyor belt 422, and the upper end surface height of the support frame plate 46 is lower than the height of the rubber layer 454 and the inner conveyor belt 422, and the support frame plate 46 is used to support the lowest paper box, so that the lower end of the lowest paper box is supported and smoothly moves from the inner conveyor belt 422 to the rubber layer 454, thereby realizing a transition effect.

[0042] like Fig.10 and Fig.11As shown, the two outer frame plates 41 are penetrated with arc-shaped limit openings 463, and the two ends of the support frame plate 46 are fixed with rotating rods 461 extending from the limit openings 463. The ends of the rotating rods 461 have limit sleeves 462, and the limit sleeves 462 are sleeved with the inner drive shaft 421 at the end. The support frame plate 46 can rotate in an arc along the axis of the inner drive shaft 421 at the end. Since the two sides of the support frame plate 46 are respectively matched with the rubber layer 454 and the inner transmission belt 422, the support frame plate 4 6 The two sides are in arc shape to ensure that the paper can be transferred, and the height is lower than the rubber layer 454 and the inner conveyor belt 422 to avoid jamming. In addition, the support frame plate 46 can rotate along the limit sleeve 462. When the outer frame plate 44 is taken out upward, the support frame plate 46 needs to be separated from the rubber layer 454. Then, the support frame plate 46 rotates into an inclined shape to ensure that the support frame plate 46 is separated from the rubber layer 454, so that the outer frame plate 44 can be taken out, which is convenient for adjusting the single sheet separation part 45;

[0043] The axis of the limit opening 463 coincides with the axis of the inner drive shaft 421 at the end. When the support frame plate 46 is horizontal, the rotating rod 461 fits with one end of the limit opening 463. When the support frame plate 46 is horizontal, the upper end can bear heavy objects, achieve the supporting function, and avoid tilting.

[0044] like Figure 7 As shown, the outer frame plate 44 has an arc-shaped pasting opening 441 on one side for conveying a single paper box, and the arc-shaped pasting opening 441 is in contact with the separation shaft 1 452, so that only one-fourth of the outer side of the separation shaft 1 452 can block the paper box, so that the paper box near the lower end changes in shape along the separation shaft 1 452, and the paper boxes are relatively layered, and the separation shaft 1 452 rotates, so that the layered paper boxes can be subjected to an inward movement force, and the layered paper boxes are prevented from moving between the separation shaft 1 452 and the separation shaft 2 453, so as to achieve a blocking effect. In addition, after the bottom paper box of the layered paper box moves out, the second to last paper box will become the first to last paper box, so that the paper box also moves out. Under the action of the gas in the oblique seam 401, the edges of the layered paper boxes are relatively evenly stacked, and wrinkles are avoided as much as possible.

[0045] like Figure 6 and Figure 7 As shown, the interior of the separation shaft 452 is hollow, and an inner shaft 402 is fixedly passed through the separation shaft 452 from the outside to the inside. The interior of the inner shaft 402 is hollow, and a through hole 403 is passed through the outer side of the inner shaft 402. The inner shaft 402 is used to transport gas into the separation shaft 452. The outer wall of the separation shaft 452 is circumferentially distributed with oblique slits 401. The oblique slits 401 are used to blow the gas inside the separation shaft 452 outward, and the gas acts on the paper box to reduce wrinkles on the edge of the paper box, and also increase the friction with the rubber layer 454, thereby reducing the friction with the separation shaft 452.

[0046] like Figure 6 and Figure 7 As shown, an annular groove 404 connected to the interior is formed at one end of the separation shaft 452, and a blocking layer 405 extending into the annular groove 404 is fixed on a side support plate 451. The blocking layer 405 is in contact with the inner wall of the separation shaft 452 to block the oblique slit 401. The blocking layer 405 is in an arc shape protruding upward, so that the oblique slit 401 in the lower part is kept blown to make the paper box fit to the rubber layer 454, so as to increase the friction between the paper box and the rubber layer 454, so that the gas can only move outward and downward, and can only blow outward at an angle to smooth the paper box.

[0047] The working principle of the present invention is as follows: the stacked cartons are placed in the frame formed by the outer frame plate 41 and the outer frame plate 44, and the outer side of the cartons contacts the inner side of the outer frame plate 41 and the outer frame plate 44, so that the cartons are kept neat, and the inner drive shaft 421 is rotated under the action of the servo motor 43, and the cartons at the bottom are driven by the inner transmission belt 422 to move toward the separation shaft 1 452 and the separation shaft 2 453, and the separation shaft 1 452 and the separation shaft 2 453 are also rotated under the action of the transmission belt 47, as shown in FIG. Fig. 9 As shown, the separation shaft 2 453 rotates counterclockwise, and under the friction of the rubber layer 454 and the inner conveyor belt 422, the lowest paper box is driven to move out from between the separation shaft 1 452 and the separation shaft 2 453 and fall onto the outer conveyor belt 3. The separation shaft 1 452 rotates counterclockwise to block the remaining paper boxes and complete the single sheet separation.

[0048] In addition, when the inner conveyor belt 422 drives the bottommost paper box to move, the paper boxes have friction with each other, so that the paper boxes near the bottom are all subjected to force, such as Fig. 9 As shown, the paper boxes near the lower end will be close to the separation shaft 452 and have a layer, so as to achieve the preliminary separation of the neatly stacked paper boxes. An air pump is provided on the outside to blow air into the inner shaft 402, so that the gas moves out from the oblique slit 401. Under the obstruction of the blocking layer 405, the gas can only move toward the oblique slit 401 at the lower end, and the airflow is inclined outward. The paper box at the lower end is first blown by the inclined airflow. Under the action of the airflow, the degree of squeezing between the paper box and the rubber layer 454 increases, thereby increasing the friction between the two. The other paper boxes are relatively far away from the separation shaft 452, thereby reducing the friction between the paper box and the separation shaft 452, so that the paper box at the lower end is subjected to a greater force from the rubber layer 454, thereby making the separation smoother. The remaining paper boxes will be blocked by the rotation of the separation shaft 452, thereby ensuring the transmission of single sheets.

[0049] In addition, before the paper box at the bottom is pushed close to the separation axis 1 452 and the separation axis 2 453 and enters the angle between the separation axis 1 452 and the separation axis 2 453, it is affected by the inclined outward airflow, which can cause the paper box at the bottom to be pushed obliquely downward and be relatively flattened, avoiding the generation of larger wrinkles when passing between the separation axis 1 452 and the separation axis 2 453, and can smoothly pass through the gap between the separation axis 1 452 and the separation axis 2 453 to avoid being stuck.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic paper feeding device for a carton printing mechanism, comprising a printing press and a bracket fixed to the outside thereof, characterized in that: An external transmission belt is installed on the bracket for transmission, and a paper feeding unit is also installed on the bracket; The paper feeding unit comprises two outer frame plates fixed on the bracket, the two outer frame plates are sleeved with outer frame plates, an inner driving part for conveying the sheet paper box is installed between the two outer frame plates, and a single sheet separation part for separating the stacked paper boxes is installed outside the outer frame plates; the inner driving part pushes the sheet paper box into the single sheet separation part to separate the sheet paper box into single sheets; The inner driving part comprises a plurality of inner driving shafts arranged in an array, an inner conveyor belt is sleeved on the outer side of the plurality of inner driving shafts, and the plurality of inner driving shafts are rotatably mounted between two outer frame plates, the two outer frame plates and the outer frame plate form a frame shape, the interior of which is used to stack paper boxes, and the paper boxes are supported on the upper end of the inner conveyor belt, and the outer walls of the paper boxes are in contact with the outer frame plate and the outer frame plate respectively; The single sheet separation part includes two support plates fixed on the outside of the outer frame plate, a separation shaft 1 and a separation shaft 2 are rotatably installed between the two support plates, the sides of the separation shaft 1 and the separation shaft 2 are connected to the inside of the outer frame plate, the separation shaft 1 and the separation shaft 2 are arranged up and down, the outer ends of the separation shaft 1 and the separation shaft 2 are sleeved with a transmission belt for driving the two to rotate, the separation shaft 2 and the closest inner drive shaft are also sleeved with a transmission belt for driving the two to rotate, and the two inner drive shafts with the farthest intervals are also sleeved with a transmission belt for driving the two to rotate. The outer side of the outer frame plate is fixed with A servo motor is used to drive the inner driving shaft to rotate; when the inner conveyor belt drives the lowest carton to move, due to the friction between the cartons, the cartons close to the lower end are all subjected to force, and the cartons close to the lower end will stick to the separation shaft and have a layer, so as to achieve the preliminary separation of the neatly stacked cartons. An air pump is provided on the outside to blow air into the inner shaft to make the gas move out from the oblique slit. Under the obstruction of the barrier layer, the gas can only move toward the oblique slit at the lower end, and the airflow is inclined outward, and the lowest carton is blown by the inclined airflow first. Under the action of the airflow, the degree of extrusion between the carton and the rubber layer increases.

2. The automatic paper feeding device of the carton printing mechanism according to claim 1, characterized in that: The second separation shaft is in the same horizontal plane as the inner driving shaft. A rubber layer is sleeved on the second separation shaft to increase friction. The upper end surface of the rubber layer is flush with the upper end surface of the inner conveyor belt. The gap between the rubber layer and the first separation shaft is only wide enough for a paper box to pass through.

3. The automatic paper feeding device of the carton printing mechanism according to claim 2, characterized in that: A support frame plate for supporting the paper box is also provided between the two outer frame plates. The support frame plate is located between the rubber layer and the inner conveyor belt, and the two sides of the support frame plate are respectively in contact with the rubber layer and the inner conveyor belt. The upper end surface height of the support frame plate is lower than the height of the rubber layer and the inner conveyor belt.

4. The automatic paper feeding device of the carton printing mechanism according to claim 3, characterized in that: The two outer frame plates are penetrated by arc-shaped limiting openings, and rotating rods extending from the limiting openings are fixed at both ends of the support frame plate. The ends of the rotating rods are provided with limiting sleeves, and the limiting sleeves are sleeved with the inner driving shaft at the end, so that the support frame plate can rotate in an arc shape along the axis of the inner driving shaft at the end; The axis of the limit opening coincides with the axis of the inner driving shaft at the end, and when the support frame plate is horizontal, the rotating rod fits with one end of the limit opening.

5. The automatic paper feeding device of the carton printing mechanism according to claim 4, characterized in that: The outer frame plate has a curved opening on one side for conveying a single paper box, and the curved opening is in contact with a separation axis; The interior of the separation shaft is hollow, and an inner shaft is fixed through the separation shaft from the outside to the inside. The interior of the inner shaft is hollow, and a through hole is passed through the outer side of the inner shaft. The inner shaft is used to transport gas into the separation shaft. The outer wall of the separation shaft is circumferentially distributed with oblique slits, and the oblique slits are used to blow the gas inside the separation shaft outward.

6. The automatic paper feeding device of the carton printing mechanism according to claim 5, characterized in that: One end of the separation shaft is provided with an annular groove connected to the interior, and a blocking layer extending into the annular groove is fixed on one side of the support plate, and the blocking layer is in contact with the inner wall of the separation shaft to block the oblique slit. The blocking layer is in an arc shape protruding upward, and the oblique slit of the lower part is kept blown to make the paper box fit onto the rubber layer, so as to increase the friction between the paper box and the rubber layer.

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