A paper pressing device and a printing apparatus

Abstract

The application provides a paper pressing device and a printing equipment. The device is applied to the printing equipment with a printing frame and a printing base plate. The printing frame forms a printing working cavity inside, and the printing base plate is located in the printing working cavity. The device comprises a first pressing strip assembly and a second pressing strip assembly, and a first driving assembly and a second driving assembly, which are all arranged on the printing frame. The first pressing strip assembly and the second pressing strip assembly respectively have a first pressing strip and a second pressing strip extending in the printing working cavity. The first pressing strip and the second pressing strip are both located between the bottom of the printing frame and the printing base plate. Paper is input or output from the printing working cavity through the bottom of the printing frame. The first driving assembly can independently drive the first pressing strip assembly to move the first pressing strip to a first position. The second driving assembly can independently drive the second pressing strip assembly to move the second pressing strip to a second position. The first position and the second position are independently set according to the pattern area on the paper. The printing base plate partially abuts against the first pressing strip assembly and the second pressing strip assembly. The printing base plate is forced to move downward to press the paper flat by the first pressing strip and the second pressing strip.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing equipment technology, and in particular to a paper pressing device with dual power independent drive and an inkjet printing equipment equipped with the paper pressing device. Background Technology

[0002] Digital inkjet printing has advantages such as fast production speed, no need for plate making, printing from a single sheet, environmentally friendly raw materials, low cost, wide range of orders, and ability to meet personalized customization. This has made inkjet printing equipment using digital inkjet technology the mainstream method for paperboard printing.

[0003] Currently, digital inkjet printing on cardboard mainly includes scanning and single-pass printing (a technology that uses high-speed cardboard movement and a fixed printhead to eject ink to complete full-width printing). However, regardless of whether it is scanning or single-pass digital inkjet printing, the cardboard (a type of substrate or printing material) used needs to meet certain flatness requirements. The flatness of the cardboard used by users often exceeds the flatness requirements of the printing equipment, especially cardboard with more than 5 layers, which often has raised corners and is not easily absorbed. This causes the cardboard to easily damage the printhead in the printing section when it is fed into the printing chamber.

[0004] Generally speaking, cardboard has a pre-coating liquid before printing, and the pre-coating liquid on the cardboard may not be completely dry before it enters the printing chamber. If the edges of the cardboard are warped, the incompletely dried pre-coating liquid will be rubbed onto the bottom surface of the print head in the printing section, which will cause the print head in the printing section to be easily clogged.

[0005] Therefore, in order to avoid damage or blockage of the printhead in the printing section due to cardboard warping, a paper pressing device is usually installed in the printing working chamber to flatten the cardboard, so that the cardboard used by the user meets the flatness required by the printing equipment.

[0006] In the existing technology, the paperboard is usually fed into the printing chamber in the center. The paperboard usually has a preset pattern area, and the print head in the printing unit will print on the pattern area on the paperboard.

[0007] However, traditional paper pressing devices use a single power drive, which means that the pair of pressing strips in the traditional paper pressing device can only move synchronously and symmetrically relative to the middle position of the printing working chamber. Therefore, the traditional paper pressing device can only complete centered printing (the pattern area on the paperboard is located in the middle position of the paperboard).

[0008] It is evident that traditional paper pressing devices, due to their single-power drive, cannot control the movement of each pressing strip assembly individually. When certain special patterns require offset printing (the pattern area on the cardboard is off-center from the center of the cardboard), traditional paper pressing devices cannot properly use a pair of pressing strip assemblies to flatten the warped cardboard. Utility Model Content

[0009] The paper pressing device and printing equipment provided by this utility model aim to solve at least some of the defects of existing paper pressing devices.

[0010] In a first aspect, this utility model provides a paper pressing device. The paper pressing device is applied to a printing machine having a printing frame and a printing base plate, wherein a printing working cavity is formed inside the printing frame, and the printing base plate is located within the printing working cavity. The paper pressing device includes at least: The first pressure strip assembly, the second pressure strip assembly, the first drive assembly, and the second drive assembly are all mounted on the inkjet printer frame; The first pressure strip assembly has a first pressure strip, and the second pressure strip assembly has a second pressure strip. Both the first pressure strip and the second pressure strip extend in the printing working cavity along a first direction. Both the first pressure strip and the second pressure strip are located between the bottom of the printing frame and the printing base plate. The paperboard is input into or output from the bottom of the printing frame along the first direction into the printing working cavity. The first driving component can independently drive the first pressure bar component to move along the second direction, so that the first pressure bar moves along the second direction to a preset first position; The second driving component can independently drive the second pressure bar component to move along the second direction, so that the second pressure bar moves along the second direction to a preset second position; The cardboard has a preset pattern area, and the first position and the second position are set independently according to the pattern area on the cardboard; The printing base plate abuts against at least a portion of the first pressure strip assembly and the second pressure strip assembly, and the printing base plate can move in a third direction toward the bottom of the printing frame to force the first pressure strip and the second pressure strip to flatten the cardboard located in the printing working cavity; The first direction, the second direction, and the third direction are orthogonal to each other.

[0011] In some embodiments, the inkjet printer frame includes at least: A pair of crossbeams, the pair of crossbeams having a preset target spacing in the first direction, and the inner sides of the pair of crossbeams enclosing the printing working cavity; A pair of first guide rails are respectively disposed on the inner side of a pair of crossbeams; Each of the beams extends along the second direction, and each of the first guide rails extends along the second direction; Two pairs of sliding components are provided, each pair of sliding components is disposed on a pair of first guide rails, and each pair of sliding components can move independently along the second direction on the pair of first guide rails; The two pairs of sliding components correspond to the first pressure strip assembly and the second pressure strip assembly, respectively.

[0012] In some embodiments, the sliding component includes: A first slider is sleeved on the first guide rail, and the first slider can move along the second direction under the guidance of the first guide rail; The mounting base is fixed on the first slider so that the mounting base can move along with the movement of the first slider; The second guide rail is disposed on the mounting base plate and extends along the third direction; The second slider is sleeved on the second guide rail, and the second slider can move along the third direction under the guidance of the second guide rail; A spring top cover is fixed to the second slider so that the spring top cover can move along with the movement of the second slider; A spring base, wherein a positioning post is provided on the spring base, and a positioning hole is provided on the spring top cover, and the positioning post is positioned corresponding to the positioning hole; A limiting block, wherein the limiting block and the spring base are respectively disposed on opposite sides of the mounting base in the third direction; The limiting block and the spring base can jointly limit the range of movement of the spring top cover in the third direction; A return spring, one end of which is sleeved on the positioning post and the other end of which is embedded in the positioning hole; The axial directions of both the positioning pin and the positioning hole are parallel to the third direction.

[0013] In some embodiments, the first pressure strip assembly includes: A pair of first engaging portions are respectively connected to a mounting base plate in a pair of sliding members corresponding to the first pressure strip assembly, and each of the first engaging portions extends along the first direction to the outside of the printing working cavity; A first pressure block and a second pressure block are respectively connected to a spring top cover in a pair of sliding members corresponding to the first pressure bar assembly, so that the first pressure block and the second pressure block can move in accordance with the movement of the spring top cover in the pair of sliding members corresponding to the first pressure bar assembly; The two ends of the first pressure strip in the first direction are respectively connected to the bottom of the first pressure block and the second pressure block, and the printing base plate abuts against the first pressure block and the second pressure block; When the printing base plate moves along the third direction toward the bottom of the printing machine frame, the first pressure block and the second pressure block compress the return spring in a pair of sliding members corresponding to the first pressure strip assembly to drive the first pressure strip to flatten the cardboard; When the printing base plate moves in the third direction away from the bottom of the printing machine frame, the return spring in the pair of sliding members corresponding to the first pressure bar assembly forces the first pressure block and the second pressure block to move in the third direction away from the bottom of the printing machine frame until the spring top cover in the pair of sliding members corresponding to the first pressure bar assembly abuts against the limiting block in the pair of sliding members corresponding to the first pressure bar assembly.

[0014] In some embodiments, the first driving component includes at least: The system comprises a first servo drive mechanism, a first transmission shaft, a pair of first pulleys, a pair of second pulleys, and a pair of first synchronous belts. The first servo drive mechanism is fixed on the crossbeam, and the first servo drive mechanism is at least partially connected to the first transmission shaft; A pair of first pulleys are respectively disposed at the two opposite ends of the first drive shaft in its axial direction, and a pair of second pulleys are respectively disposed at one end of the pair of crossbeams near the first pressure strip; Each pair of first synchronous belts is fitted onto a pair of first pulleys and a pair of second pulleys, and each pair of first synchronous belts engages with a pair of first engaging parts, so that the pair of first synchronous belts can drive the pair of first engaging parts to move the mounting base plate in the pair of sliding members corresponding to the first pressure strip assembly along the second direction. The first drive shaft, a pair of first pulleys, a pair of second pulleys, and a pair of first synchronous belts are all located outside the printing working cavity.

[0015] In some embodiments, when the mounting base plate in a pair of sliding members corresponding to the first pressure strip assembly moves along the second direction, the first pressure block and the second pressure block can drive the first pressure strip to move along the second direction to a preset first position.

[0016] In some embodiments, the second pressure strip assembly includes: A pair of second engaging portions, each of the pair of second engaging portions being connected to a mounting base plate in a pair of sliding members corresponding to the second pressure strip assembly; Each of the second engagement portions extends along the second direction, and each of the second engagement portions is located inside the printing working cavity; The third and fourth pressure blocks are respectively connected to the spring top covers in a pair of sliding members corresponding to the second pressure bar assembly, so that the third and fourth pressure blocks can move in accordance with the movement of the spring top covers in the pair of sliding members corresponding to the second pressure bar assembly; The two ends of the second pressure strip in the first direction are respectively connected to the bottom of the third pressure block and the fourth pressure block, and the printing base plate abuts against the third pressure block and the fourth pressure block; When the printing base plate moves along the third direction toward the bottom of the printing machine frame, the third pressure block and the fourth pressure block compress the return spring in a pair of sliding members corresponding to the second pressure strip assembly to drive the second pressure strip to flatten the cardboard; When the printing base plate moves in the third direction away from the bottom of the printing machine frame, the return spring in the pair of sliding members corresponding to the second pressure bar assembly forces the first pressure block and the second pressure block to move in the third direction away from the bottom of the printing machine frame until the spring top cover in the pair of sliding members corresponding to the second pressure bar assembly abuts against the limiting block in the pair of sliding members corresponding to the second pressure bar assembly.

[0017] In some embodiments, the second driving component includes at least: The system includes a second servo drive mechanism, a second transmission shaft, a pair of third pulleys, a pair of fourth pulleys, and a pair of second synchronous belts. The second servo drive mechanism is fixed on the crossbeam, and the second servo drive mechanism is at least partially connected to the second transmission shaft; A pair of third pulleys are respectively disposed at the two opposite ends of the second drive shaft in its axial direction, and a pair of fourth pulleys are respectively disposed at one end of the pair of crossbeams near the second pressure strip; A pair of second synchronous belts are each sleeved on a pair of third pulleys and a pair of fourth pulleys, and the pair of second synchronous belts respectively engage with a pair of second meshing parts, so that the pair of second synchronous belts can drive the pair of second meshing parts to move the mounting base plate in a pair of sliding members corresponding to the second pressure strip assembly along the second direction; The second drive shaft, the pair of third pulleys, the pair of fourth pulleys, and the pair of second synchronous belts are all located inside the printing working cavity.

[0018] In some embodiments, when the mounting base plate in a pair of sliding members corresponding to the second pressure strip assembly moves along the second direction, the third pressure block and the fourth pressure block can drive the second pressure strip to move along the second direction to a preset second position.

[0019] Secondly, this utility model provides a printing device. The printing device includes: The inkjet printer frame, inkjet printing base plate, inkjet printing section, and the aforementioned paper pressing device; The paper pressing device is mounted on the inkjet printer frame, and the top of the inkjet printing base plate can support the inkjet printing section. The printing unit can be moved to a preset printing height, at which point the bottom of the printing base plate abuts against the first, second, third, and fourth pressure blocks of the paper pressing device; The printing unit corresponds to a preset pattern area on the cardboard that is fed into the printing chamber of the printing machine frame, so that the printing unit prints on the pattern area of ​​the cardboard.

[0020] At least one beneficial effect of the paper pressing device and printing equipment provided in this utility model embodiment is that: the paper pressing device independently drives the first pressing strip assembly to move along the second direction through the first driving component, and simultaneously independently drives the second pressing strip assembly to move along the second direction through the second driving component. This design enables the first pressing strip assembly and the second pressing strip assembly to move independently and asymmetrically. The first pressing strip moves along the second direction to a preset first position, and the second pressing strip moves along the second direction to a preset second position. The first position and the second position are independently set according to the pattern area on the cardboard. This design enables the paper pressing device to still use the first pressing strip assembly and the second pressing strip assembly to flatten the warped cardboard normally when the printing equipment performs offset printing. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 A schematic diagram of center-printing provided for an embodiment of this utility model; Figure 2 A schematic diagram of offset inkjet printing provided for an embodiment of this utility model; Figure 3A schematic diagram of the structure of the paper pressing device provided in this embodiment of the utility model, which is mounted on the inkjet printer frame; Figure 4 Provided for the embodiments of this utility model Figure 3 A magnified view of a portion at point A; Figure 5 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point B; Figure 6 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point C; Figure 7 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point D; Figure 8 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point E; Figure 9 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point F; Figure 10 Provided for the embodiments of this utility model Figure 3 A magnified view of the area at point G; Figure 11 An exploded view of the first pressure strip assembly and a pair of sliding components corresponding to the first pressure strip assembly, excluding the first slider, provided in an embodiment of the present utility model; Figure 12 Provided for the embodiments of this utility model Figure 11 A magnified view of the area at point H; Figure 13 An exploded view of the second pressure strip assembly provided in an embodiment of this utility model.

[0023] Figure label: 1. Printing base plate; 2. First pressure strip; 3. Second pressure strip; 4. Crossbeam; 5. First guide rail; 6. First slider; 7. Mounting base plate; 8. Second guide rail; 9. Second slider; 10. Spring top cover; 11. Spring base; 12. Limiting block; 13. Return spring; 14. First meshing part; 15. First pressure block; 16. Second pressure block; 17. First servo drive mechanism; 18. First transmission shaft; 19. First pulley; 20. Second pulley; 21. ... 21. Synchronous belt; 22. Second meshing part; 23. Third pressure block; 24. Fourth pressure block; 25. Second servo drive mechanism; 26. Second transmission shaft; 27. Third pulley; 28. Fourth pulley; 29. ​​Second synchronous belt; 30. Cardboard; 31. First limit switch; 32. Second limit switch; 33. Third limit switch; 34. Fourth limit switch; 35. First sensing plate; 36. Second sensing plate; 37. Third sensing plate; 38. Fourth sensing plate; 101. Printing working chamber; 102. Bottom of the printing machine frame; 103. Paper feed side; 104. Paper output side; 1001. Positioning hole; 1101. Positioning post; 3001. Pattern area. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0025] It should be noted that, unless otherwise explicitly specified and limited, the terms "approaching", "far from", "first direction", "second direction", "third direction", etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installation," "fitting," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixing" can be bolt fixing, snap-fit ​​fixing, or glue fixing. The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature. "A plurality" or "several" means two or more. In addition, "and / or" includes any and all combinations of one or more of the related listed items. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In this embodiment, the specific shape, structure and size of the "paper pressing device and printing equipment" are not limited. Those skilled in the art can selectively use any suitable implementation method according to actual needs.

[0028] Please see Figure 1 and Figure 2 The paperboard 30 is centered in the inkjet printing working cavity 101, and the preset pattern area 3001 on the paperboard 30 is centered in the length direction of the paperboard 30.

[0029] In the following description, such as Figures 1-13As shown, the following situations exist: the first direction or the length direction of the cardboard 30 is set as the X direction, the second direction or the width direction of the cardboard 30 is set as the Y direction, the third direction or the thickness direction of the cardboard 30 is set as the Z direction, the distance between the center of the preset pattern area 3001 on the cardboard 30 and the center of the cardboard 30 in the second direction or the width direction of the cardboard 30 is set as the offset distance, the scenario where the offset distance is equal to zero is set as center printing, the scenario where the offset distance is greater than zero is set as offset printing, and the movement of the printing base plate 1 along the third direction toward the bottom 102 of the printing machine frame is set as downward movement or descent. The direction in which the paperboard 30 enters the printing working chamber 101 from the bottom 102 of the printing machine frame along the first direction is defined as the paper feeding direction. The direction in which the paperboard 30 is output from the bottom 102 of the printing machine frame along the first direction to the outside of the printing working chamber 101 is defined as the paper output direction. The paper feeding direction and the paper output direction are collectively referred to as the paperboard conveying direction or paper feeding direction. The side of the paperboard 30 entering the printing working chamber 101 along the conveying direction is defined as the paper feeding side 103, and the side of the paperboard 30 outputting to the outside of the printing working chamber 101 along the conveying direction is defined as the paper output side 104. The X direction, Y direction and Z direction are orthogonal to each other.

[0030] Please see Figures 1-3 The paper pressing device is used in a printing machine with a printing frame and a printing base plate 1, wherein a printing working cavity 101 is formed inside the printing frame, and the printing base plate 1 is located inside the printing working cavity 101.

[0031] like Figures 1-13 As shown, the paper pressing device includes at least: a first pressing strip assembly, a second pressing strip assembly, a first driving assembly, and a second driving assembly.

[0032] It should be noted that the first pressure strip assembly, the second pressure strip assembly, the first drive assembly, and the second drive assembly are all mounted on the inkjet printer frame.

[0033] It is understood that the first pressure strip assembly has a first pressure strip 2, and the second pressure strip assembly has a second pressure strip 3.

[0034] In this embodiment, both the first pressure strip 2 and the second pressure strip 3 extend along the X direction within the printing working cavity 101.

[0035] The first pressure bar 2 and the second pressure bar 3 are both located between the bottom 102 of the inkjet printer frame and the inkjet printing base plate 1, and the paperboard 30 is input into or output from the bottom 102 of the inkjet printer frame along the X direction into the inkjet printing working cavity 101. This indicates that the paperboard 30 entering the inkjet printing working cavity 101 is located below the first pressure bar 2 and the second pressure bar 3.

[0036] In addition, the first driving component can independently drive the first pressure bar component to move along the Y direction, and the second driving component can independently drive the second pressure bar component to move along the Y direction. This design enables the first pressure bar component and the second pressure bar component to move independently and asymmetrically.

[0037] Furthermore, the cardboard 30 has a preset pattern area 3001. The first pressing strip 2 moves along the Y direction to a preset first position, and the second pressing strip 3 moves along the Y direction to a preset second position. The first position and the second position are independently set according to the pattern area 3001 on the cardboard 30. That is, when the inkjet printing equipment performs offset inkjet printing on the cardboard 30, the first pressing strip 2 and the second pressing strip 3 can move independently to the top of the cardboard 30 and the bottom of the inkjet printing base plate 1, and have a preset target distance from the two opposite edges of the pattern area 3001 in the Y direction. This design allows the paper pressing device to still use the first pressing strip 2 and the second pressing strip 3 to flatten the warped cardboard 30 normally when the inkjet printing equipment performs offset inkjet printing.

[0038] Specifically, the printing base plate 1 abuts against at least a portion of the first pressure strip 2 assembly and the second pressure strip 3 assembly, and the movement of the printing base plate 1 along the Z direction toward the bottom 102 of the printing machine frame can force the first pressure strip 2 and the second pressure strip 3 to flatten the cardboard 30 located in the printing working cavity 101.

[0039] To further explain, the first pressure strip 2 and the second pressure strip 3 can flatten the warped cardboard that has passed through the printing chamber, thereby preventing the warped cardboard from damaging the printhead in the printing section and preventing the pre-coating liquid on the warped cardboard from clogging the printhead in the printing section.

[0040] In some embodiments, such as Figures 3-12 As shown, the inkjet printer frame includes at least: a pair of crossbeams 4, a pair of first guide rails 5, and two pairs of sliding components.

[0041] Specifically, a pair of crossbeams 4 have a preset target spacing in the X direction, and the inner sides of the pair of crossbeams 4 enclose a printing working cavity 101.

[0042] To further explain, a pair of first guide rails 5 are respectively located on the inner side of a pair of crossbeams 4.

[0043] In this embodiment of the application, each crossbeam 4 extends along the Y direction, and each first guide rail 5 extends along the Y direction.

[0044] It should be noted that both pairs of sliding parts are mounted on a pair of first guide rails 5, and both pairs of sliding parts can move independently along the Y direction on the pair of first guide rails 5.

[0045] It is understandable that the two pairs of sliding parts correspond to the first pressure strip 2 assembly and the second pressure strip 3 assembly, respectively.

[0046] In some embodiments, such as Figures 3-12 As shown, the sliding component includes: a first slider 6, a mounting base 7, a second guide rail 8, a second slider 9, a spring top cover 10, a spring base 11, a limiting block 12, and a return spring 13.

[0047] The first slider 6 is mounted on the first guide rail 5, and the first slider 6 can move along the Y direction under the guidance of the first guide rail 5.

[0048] In addition, the mounting base plate 7 is fixed on the first slider 6 so that the mounting base plate 7 can move along with the movement of the first slider 6.

[0049] In addition, the second guide rail 8 is disposed on the mounting base plate 7 and extends along the Z direction.

[0050] Specifically, the second slider 9 is mounted on the second guide rail 8, and the second slider 9 can move along the Z direction under the guidance of the second guide rail 8.

[0051] To further explain, the spring top cover 10 is fixed to the second slider 9 so that the spring top cover 10 can move along with the movement of the second slider 9.

[0052] In this embodiment of the application, a positioning post 1101 is provided on the spring base 11, and a positioning hole 1001 is provided on the spring top cover 10, and the positioning post 1101 is positioned in a manner corresponding to the positioning hole 1001.

[0053] It should be noted that the limiting block 12 and the spring base 11 are respectively disposed on opposite sides of the mounting base 7 in the Z direction.

[0054] It is understandable that the limiting block 12 and the spring base 11 can together limit the range of movement of the spring top cover 10 in the Z direction.

[0055] Specifically, one end of the return spring 13 is sleeved on the positioning post 1101, and the other end of the spring is embedded in the positioning hole 1001.

[0056] To further clarify, the axial directions of both the positioning pin 1101 and the positioning hole 1001 are parallel to the Z direction.

[0057] In some embodiments, such as Figures 1-13 As shown, the first pressure bar assembly includes: a pair of first engaging parts 14, a first pressure block 15, and a second pressure block 16.

[0058] Among them, a pair of first engaging portions 14 are respectively connected to the mounting base plate 7 in a pair of sliding members corresponding to the first pressure strip 2 assembly, and each first engaging portion 14 extends to the outside of the inkjet working cavity 101 along the X direction.

[0059] In addition, the first pressure block 15 and the second pressure block 16 are respectively connected to the spring top cover 10 in a pair of sliding members corresponding to the first pressure bar 2 assembly, so that the first pressure block 15 and the second pressure block 16 can move along with the movement of the spring top cover 10 in the pair of sliding members corresponding to the first pressure bar 2 assembly.

[0060] In addition, the two ends of the first pressure strip 2 in the X direction are respectively connected to the bottom of the first pressure block 15 and the second pressure block 16, and the printing base plate 1 abuts against the first pressure block 15 and the second pressure block 16.

[0061] It should be noted that when the printing base plate 1 moves along the Z direction toward the bottom 102 of the printing machine frame, the first pressure block 15 and the second pressure block 16 compress the return spring 13 in a pair of sliding parts corresponding to the first pressure strip 2 assembly to drive the first pressure strip 2 to flatten the cardboard 30.

[0062] Understandably, when the printing base plate 1 moves away from the bottom 102 of the printing machine frame along the Z direction, the return spring 13 in the pair of sliding members corresponding to the first pressure bar 2 assembly forces the first pressure block 15 and the second pressure block 16 to move away from the bottom 102 of the printing machine frame along the Z direction until the spring top cover 10 in the pair of sliding members corresponding to the first pressure bar 2 assembly abuts against the limiting block 12 in the pair of sliding members corresponding to the first pressure bar 2 assembly.

[0063] In some embodiments, such as Figures 1-13 As shown, the first drive assembly includes at least: a first servo drive mechanism 17, a first transmission shaft 18, a pair of first pulleys 19, a pair of second pulleys 20, and a pair of first synchronous belts 21.

[0064] The first servo drive mechanism 17 is fixed on the crossbeam 4, and the first servo drive mechanism 17 is at least partially connected to the first transmission shaft 18.

[0065] In addition, a pair of first pulleys 19 are respectively disposed at the two opposite ends of the first drive shaft 18 in its axial direction, and a pair of second pulleys 20 are respectively disposed at one end of a pair of crossbeams 4 near the first pressure bar 2.

[0066] In addition, a pair of first synchronous belts 21 are each sleeved on a pair of first pulleys 19 and a pair of second pulleys 20, and the pair of first synchronous belts 21 respectively engage with a pair of first engaging parts 14, so that the pair of first synchronous belts 21 can drive the pair of first engaging parts 14 to move the mounting base plate 7 in the pair of sliding members corresponding to the first pressure strip 2 assembly along the Y direction.

[0067] In this embodiment, the first drive shaft 18, a pair of first pulleys 19, a pair of second pulleys 20 and a pair of first synchronous belts 21 are all located outside the printing working cavity 101.

[0068] In some embodiments, such as Figures 1-13 As shown, when the mounting base plate 7 in one of the pair of sliding members corresponding to the first pressure strip 2 assembly moves along the Y direction, the first pressure block 15 and the second pressure block 16 can drive the first pressure strip 2 to move along the Y direction to a preset first position.

[0069] In some embodiments, such as Figures 1-13 As shown, the second pressure bar assembly includes: a pair of second engagement parts 22, a third pressure block 23 and a fourth pressure block 24.

[0070] Among them, a pair of second engaging parts 22 are respectively connected to the mounting base plate 7 in a pair of sliding parts corresponding to the second pressure strip 3 assembly.

[0071] In addition, each second engagement portion 22 extends along the Y direction and each second engagement portion 22 is located inside the printing working cavity 101.

[0072] Furthermore, the third pressure block 23 and the fourth pressure block 24 are respectively connected to the spring top cover 10 in a pair of sliding members corresponding to the second pressure bar 3 assembly, so that the third pressure block 23 and the fourth pressure block 24 can move along with the movement of the spring top cover 10 in the pair of sliding members corresponding to the second pressure bar 3 assembly.

[0073] Specifically, the two ends of the second pressure strip 3 in the X direction are respectively connected to the bottom of the third pressure block 23 and the fourth pressure block 24, and the printing base plate 1 abuts against the third pressure block 23 and the fourth pressure block 24.

[0074] It should be noted that when the printing base plate 1 moves along the Z direction toward the bottom 102 of the printing machine frame, the third pressure block 23 and the fourth pressure block 24 compress the return spring 13 in a pair of sliding parts corresponding to the second pressure strip 3 assembly to drive the second pressure strip 3 to flatten the paperboard 30.

[0075] Understandably, when the printing base plate 1 moves away from the bottom 102 of the printing machine frame along the Z direction, the return spring 13 in the pair of sliding members corresponding to the second pressure bar 3 assembly forces the first pressure block 15 and the second pressure block 16 to move away from the bottom 102 of the printing machine frame along the Z direction until the spring top cover 10 in the pair of sliding members corresponding to the second pressure bar 3 assembly abuts against the limiting block 12 in the pair of sliding members corresponding to the second pressure bar 3 assembly.

[0076] In this embodiment, the first pressing block 15 and the third pressing block 23 located on the paper feed side 103 have the same structure, and the second pressing block 16 and the fourth pressing block 24 located on the paper output side 104 also have the same structure, but the first pressing block 15 and the second pressing block 16 have different structures.

[0077] In some embodiments, such as Figures 1-13 As shown, the second drive assembly includes at least: a second servo drive mechanism 25, a second transmission shaft 26, a pair of third pulleys 27, a pair of fourth pulleys 28, and a pair of second synchronous belts 29.

[0078] Specifically, the second servo drive mechanism 25 is fixed on the crossbeam 4, and the second servo drive mechanism 25 is at least partially connected to the second transmission shaft 26.

[0079] To further explain, a pair of third pulleys 27 are respectively located at the two opposite ends of the second drive shaft 26 in its axial direction, and a pair of fourth pulleys 28 are respectively located at one end of a pair of crossbeams 4 near the second pressure bar 3.

[0080] It should be noted that a pair of second synchronous belts 29 are both fitted on a pair of third pulleys 27 and a pair of fourth pulleys 28, and the pair of second synchronous belts 29 respectively engage with a pair of second meshing parts 22, so that the pair of second synchronous belts 29 can drive the pair of second meshing parts 22 to move the mounting base plate 7 in the pair of sliding members corresponding to the second pressure strip 3 assembly along the Y direction.

[0081] It is understandable that the second drive shaft 26, a pair of third pulleys 27, a pair of fourth pulleys 28 and a pair of second synchronous belts 29 are all located inside the printing working chamber 101.

[0082] In the embodiments of this application, the first servo drive mechanism 17 and the second servo drive mechanism 25 are two independent drive structures, and both the first servo drive mechanism 17 and the second servo drive mechanism 25 are composed of a servo motor and a reducer; therefore, the dual-power drive structure not only has the advantage of high transmission accuracy, but also has the advantages of large torque and smooth operation.

[0083] In some embodiments, such as Figures 1-13 As shown, when the mounting base plate 7 in one of the pair of sliding members corresponding to the second pressure strip 3 assembly moves along the Y direction, the third pressure block 23 and the fourth pressure block 24 can drive the second pressure strip 3 to move along the Y direction to a preset second position.

[0084] In some embodiments, such as Figures 1-13 As shown, the paper pressing device may further include a first limit switch 31, a second limit switch 32, a third limit switch 33, a fourth limit switch 34, a first sensing plate 35 and a second sensing plate 36 disposed on opposite sides of the mounting base 7 in the Y direction in a sliding member corresponding to the first pressing strip assembly, and a third sensing plate 37 and a fourth sensing plate 38 disposed on opposite sides of the mounting base 7 in the Y direction in a sliding member corresponding to the second pressing strip assembly.

[0085] In this embodiment, the first limit switch 31, the second limit switch 32, the third limit switch 33, and the fourth limit switch 34 are sequentially arranged on the same crossbeam 4 along the Y direction, and the first sensing plate 35, the second sensing plate 36, the third sensing plate 37, and the fourth sensing plate 38 respectively form a one-to-one correspondence with the first limit switch 31, the second limit switch 32, the third limit switch 33, and the fourth limit switch 34; the first limit switch 31 and the second limit switch 32 cooperate with the first sensing plate 35 and the second sensing plate 36 respectively to limit the movement range of the first pressure bar 2 in the Y direction; the third limit switch 33 and the fourth limit switch 34 cooperate with the third sensing plate 37 and the fourth sensing plate 38 respectively to limit the movement range of the second pressure bar 3 in the Y direction.

[0086] In this embodiment, since there is a gap between the second limit switch 32 and the third limit switch 33, only one fourth sensing plate 38 can be provided on the mounting base plate 7 of a sliding component of the second pressure bar assembly (i.e., the third sensing plate 37 can be provided or not). At this time, both the third limit switch 33 and the fourth limit switch 34 can limit the movement range of the second pressure bar 3 in the Y direction by cooperating with the fourth sensing plate 38. However, since the first synchronous belt 21 does not cover the entire length of the crossbeam 4, the mounting base plate 7 of a sliding component of the first pressure bar assembly must be provided with a first sensing plate 35 and a second sensing plate 36 to limit the movement range of the first pressure bar 2 in the Y direction.

[0087] Specifically, the first limit switch 31, the second limit switch 32, the third limit switch 33, and the fourth limit switch 34 are all photoelectric switches. Therefore, the first sensing plate 35, the second sensing plate 36, the third sensing plate 37, and the fourth sensing plate 38 achieve motion control by blocking or not blocking the light beams of the first limit switch 31, the second limit switch 32, the third limit switch 33, and the fourth limit switch 34.

[0088] Please continue reading. Figures 1-13 The printing equipment includes: a printing frame, a printing base plate 1, a printing section, and the aforementioned paper pressing device.

[0089] The aforementioned paper pressing device is mounted on the inkjet printer frame, and the top of the inkjet printing base plate 1 can support the inkjet printing section.

[0090] In addition, the printing unit can be moved to a preset printing height, at which point the bottom of the printing base plate 1 abuts against the first pressure block 15, the second pressure block 16, the third pressure block 23 and the fourth pressure block 24 of the paper pressing device.

[0091] Furthermore, the printing unit corresponds to a preset pattern area 3001 on the cardboard 30 that is fed into the printing working chamber 101 of the printing machine frame, so that the printing unit prints on the pattern area 3001 of the cardboard 30; generally speaking, the printing unit includes multiple printheads for inkjet printing.

[0092] Combination Figures 1-13 The process of center printing by this inkjet printing equipment is described in detail as follows: First, the user inputs the specifications of the cardboard 30 in the software interface of the inkjet printing equipment (the specifications include, but are not limited to, the width of the cardboard 30 and the size of the pattern area 3001 in the Y direction); then, the first drive assembly and the second drive assembly independently drive the first pressure strip assembly and the second pressure strip assembly to move towards each other along the Y direction toward the center position of the inkjet printing working cavity 101, until the first pressure strip 2 moves to the preset first position and the second pressure strip 3 moves to the preset second position; then, the printing section is raised to the origin position (i.e., the highest position of the printing section); immediately afterward, the printing section is moved above the first pressure strip 2 and the second pressure strip 3 and corresponds to the center position of the inkjet printing working cavity 101; then, the printing section... The printing plate 1 is lowered to the set printing height along the Y direction. Since the printing plate 1 will abut against the first pressure block 15 and the third pressure block 23 on the paper feed side 103 and the second pressure block 16 and the fourth pressure block 24 on the paper output side 104, the first pressure bar 2 is located at the bottom of the first pressure block 15 and the second pressure block 16, and the second pressure bar 3 is located at the bottom of the third pressure block 23 and the fourth pressure block 24. Therefore, as the printing section lowers to the printing height, the first pressure bar 2 and the second pressure bar 3 are pressed down. Then, as the paperboard 30 is conveyed from the paper feed side 103 through the bottom 102 of the printing machine frame to the printing working chamber 101 along the paper feed direction, the first pressure bar 2 and the second pressure bar 3 can keep in constant contact with the warped paperboard 30, so that the warped part of the paperboard 30 can be flattened by the first pressure bar 2 and the second pressure bar 3.

[0093] In actual production, users may have orders for cardboard that is wide (i.e., larger in the Y direction) and short (i.e., smaller in the X direction). The pattern area on the cardboard used in these orders is only located on one side of the cardboard in the Y direction (i.e., the pattern area is not centered). In other words, in actual production, users may require offset printing on the cardboard. However, since the two pressure bars in the traditional paper pressing device can only move synchronously and symmetrically, and the printing unit can only perform centered printing, the operator can only rotate the cardboard in the offset printing scenario 90 degrees to feed the paper (i.e., convert the original width direction of the cardboard to the conveying direction or paper feeding direction of the printing equipment). Such an offset printing scheme will result in a large blank area passing through the printing unit during the paper feeding process of each cardboard, which will greatly affect the production efficiency of the printing equipment.

[0094] Combination Figures 1-13 The printing unit in this inkjet printing equipment can move according to the pattern area 3001 on the cardboard 30, so that the printing unit can always correspond to the pattern area 3001 on the cardboard 30, thereby directly printing on the cardboard 30 above the pattern area 3001, which can greatly improve the production efficiency of the inkjet printing equipment.

[0095] It should be noted that when offset printing on cardboard, the traditional paper pressing device uses a single power source to control the first and second pressing strip assemblies, which means that the two pressing strips can only move synchronously and symmetrically. Therefore, the single power drive of the traditional paper pressing device cannot achieve independent and asymmetrical movement of the first and second pressing strip assemblies. However, the dual power drive of this paper pressing device can achieve independent and asymmetrical movement of the first and second pressing strip assemblies within the effective area of ​​the printing base plate 1, thereby reducing the risk of the warped part of the cardboard damaging the printhead.

[0096] In summary, the paper pressing device and printing equipment provided by this utility model embodiment allow the first pressing strip assembly to move independently along the second direction via a first driving component, and the second pressing strip assembly to move independently along the second direction via a second driving component. This design enables the first and second pressing strip assemblies to move independently and asymmetrically. The first pressing strip moves along the second direction to a preset first position, and the second pressing strip moves along the second direction to a preset second position. The first and second positions are independently set according to the pattern area on the cardboard. This design allows the paper pressing device to still use the first and second pressing strip assemblies to flatten the warped cardboard normally when the printing equipment is performing offset printing.

[0097] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A paper pressing device, applied in a printing machine having a printing frame and a printing base plate, wherein a printing working cavity is formed inside the printing frame, and the printing base plate is located within the printing working cavity, characterized in that, At least including: The first pressure strip assembly, the second pressure strip assembly, the first drive assembly, and the second drive assembly are all mounted on the inkjet printer frame; The first pressure strip assembly has a first pressure strip, and the second pressure strip assembly has a second pressure strip. Both the first pressure strip and the second pressure strip extend in the printing working cavity along a first direction. Both the first pressure strip and the second pressure strip are located between the bottom of the printing frame and the printing base plate. The paperboard is input into or output from the bottom of the printing frame along the first direction into the printing working cavity. The first driving component can independently drive the first pressure bar component to move along the second direction, so that the first pressure bar moves along the second direction to a preset first position; The second driving component can independently drive the second pressure bar component to move along the second direction, so that the second pressure bar moves along the second direction to a preset second position; The cardboard has a preset pattern area, and the first position and the second position are set independently according to the pattern area on the cardboard; The printing base plate abuts against at least a portion of the first pressure strip assembly and the second pressure strip assembly, and the printing base plate can be moved in a third direction toward the bottom of the printing frame to force the first pressure strip and the second pressure strip to flatten the cardboard located in the printing working cavity; The first direction, the second direction, and the third direction are orthogonal to each other.

2. The paper pressing device according to claim 1, characterized in that, The inkjet printer frame includes at least: A pair of crossbeams, the pair of crossbeams having a preset target spacing in the first direction, and the inner sides of the pair of crossbeams enclosing the printing working cavity; A pair of first guide rails are respectively disposed on the inner side of a pair of crossbeams; Each of the beams extends along the second direction, and each of the first guide rails extends along the second direction; Two pairs of sliding components are provided, each pair of which is disposed on a pair of first guide rails, and each pair of sliding components can move independently along the second direction on the pair of first guide rails. The two pairs of sliding components correspond to the first pressure strip assembly and the second pressure strip assembly, respectively.

3. The paper pressing device according to claim 2, characterized in that, The sliding component includes: A first slider is sleeved on the first guide rail, and the first slider can move along the second direction under the guidance of the first guide rail; The mounting base is fixed on the first slider so that the mounting base can move along with the movement of the first slider; The second guide rail is disposed on the mounting base plate and extends along the third direction; The second slider is sleeved on the second guide rail, and the second slider can move along the third direction under the guidance of the second guide rail; A spring top cover is fixed to the second slider so that the spring top cover can move along with the movement of the second slider; A spring base, wherein a positioning post is provided on the spring base, and a positioning hole is provided on the spring top cover, and the positioning post is positioned corresponding to the positioning hole; A limiting block, wherein the limiting block and the spring base are respectively disposed on opposite sides of the mounting base in the third direction; The limiting block and the spring base can jointly limit the range of movement of the spring top cover in the third direction; A return spring, one end of which is sleeved on the positioning post and the other end of which is embedded in the positioning hole; The axial directions of both the positioning pin and the positioning hole are parallel to the third direction.

4. The paper pressing device according to claim 3, characterized in that, The first pressure strip assembly includes: A pair of first engaging portions are respectively connected to a mounting base plate in a pair of sliding members corresponding to the first pressure strip assembly, and each of the first engaging portions extends along the first direction to the outside of the printing working cavity; A first pressure block and a second pressure block are respectively connected to a spring top cover in a pair of sliding members corresponding to the first pressure bar assembly, so that the first pressure block and the second pressure block can move in accordance with the movement of the spring top cover in the pair of sliding members corresponding to the first pressure bar assembly; The two ends of the first pressure strip in the first direction are respectively connected to the bottom of the first pressure block and the second pressure block, and the printing base plate abuts against the first pressure block and the second pressure block; When the printing base plate moves along the third direction toward the bottom of the printing machine frame, the first pressure block and the second pressure block compress the return spring in a pair of sliding members corresponding to the first pressure strip assembly to drive the first pressure strip to flatten the cardboard; When the printing base plate moves in the third direction away from the bottom of the printing machine frame, the return spring in the pair of sliding members corresponding to the first pressure bar assembly forces the first pressure block and the second pressure block to move in the third direction away from the bottom of the printing machine frame until the spring top cover in the pair of sliding members corresponding to the first pressure bar assembly abuts against the limiting block in the pair of sliding members corresponding to the first pressure bar assembly.

5. The paper pressing device according to claim 4, characterized in that, The first driving component includes at least: The system comprises a first servo drive mechanism, a first transmission shaft, a pair of first pulleys, a pair of second pulleys, and a pair of first synchronous belts. The first servo drive mechanism is fixed on the crossbeam, and the first servo drive mechanism is at least partially connected to the first transmission shaft; A pair of first pulleys are respectively disposed at the two opposite ends of the first drive shaft in its axial direction, and a pair of second pulleys are respectively disposed at one end of the pair of crossbeams near the first pressure strip; Each pair of first synchronous belts is fitted onto a pair of first pulleys and a pair of second pulleys, and each pair of first synchronous belts engages with a pair of first engaging parts, so that the pair of first synchronous belts can drive the pair of first engaging parts to move the mounting base plate in the pair of sliding members corresponding to the first pressure strip assembly along the second direction. The first drive shaft, a pair of first pulleys, a pair of second pulleys, and a pair of first synchronous belts are all located outside the printing working cavity.

6. The paper pressing device according to claim 5, characterized in that, When the mounting base plate in one of the pair of sliding members corresponding to the first pressure strip assembly moves along the second direction, the first pressure block and the second pressure block can drive the first pressure strip to move along the second direction to a preset first position.

7. The paper pressing device according to claim 4, characterized in that, The second pressure strip assembly includes: A pair of second engaging portions, each of the pair of second engaging portions being connected to a mounting base plate in a pair of sliding members corresponding to the second pressure strip assembly; Each of the second engagement portions extends along the second direction, and each of the second engagement portions is located inside the printing working cavity; The third and fourth pressure blocks are respectively connected to the spring top covers in a pair of sliding members corresponding to the second pressure bar assembly, so that the third and fourth pressure blocks can move in accordance with the movement of the spring top covers in the pair of sliding members corresponding to the second pressure bar assembly; The two ends of the second pressure strip in the first direction are respectively connected to the bottom of the third pressure block and the fourth pressure block, and the printing base plate abuts against the third pressure block and the fourth pressure block; When the printing base plate moves along the third direction toward the bottom of the printing machine frame, the third pressure block and the fourth pressure block compress the return spring in a pair of sliding members corresponding to the second pressure strip assembly to drive the second pressure strip to flatten the cardboard; When the printing base plate moves in the third direction away from the bottom of the printing machine frame, the return spring in the pair of sliding members corresponding to the second pressure strip assembly forces the first pressure block and the second pressure block to move in the third direction away from the bottom of the printing machine frame until the spring top cover in the pair of sliding members corresponding to the second pressure strip assembly abuts against the limiting block in the pair of sliding members corresponding to the second pressure strip assembly.

8. The paper pressing device according to claim 7, characterized in that, The second driving component includes at least: The system includes a second servo drive mechanism, a second transmission shaft, a pair of third pulleys, a pair of fourth pulleys, and a pair of second synchronous belts. The second servo drive mechanism is fixed on the crossbeam, and the second servo drive mechanism is at least partially connected to the second transmission shaft; A pair of third pulleys are respectively disposed at the two opposite ends of the second drive shaft in its axial direction, and a pair of fourth pulleys are respectively disposed at one end of the pair of crossbeams near the second pressure strip; A pair of second synchronous belts are each sleeved on a pair of third pulleys and a pair of fourth pulleys, and the pair of second synchronous belts respectively engage with a pair of second meshing parts, so that the pair of second synchronous belts can drive the pair of second meshing parts to move the mounting base plate in a pair of sliding members corresponding to the second pressure strip assembly along the second direction; The second drive shaft, the pair of third pulleys, the pair of fourth pulleys, and the pair of second synchronous belts are all located inside the printing working cavity.

9. The paper pressing device according to claim 8, characterized in that, When the mounting base plate in one of the pair of sliding members corresponding to the second pressure strip assembly moves along the second direction, the third pressure block and the fourth pressure block can drive the second pressure strip to move along the second direction to a preset second position.

10. A printing device, characterized in that, include: The inkjet printer frame, the inkjet printing base plate, the inkjet printing section, and the paper pressing device as described in any one of claims 1-9; The paper pressing device is mounted on the inkjet printer frame, and the top of the inkjet printing base plate can support the inkjet printing section. The printing unit can be moved to a preset printing height, at which point the bottom of the printing base plate abuts against the first, second, third, and fourth pressure blocks of the paper pressing device; The printing unit corresponds to a preset pattern area on the cardboard that is fed into the printing chamber of the printing machine frame, so that the printing unit prints on the pattern area of ​​the cardboard.

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