A packaging box printing machine facilitating position positioning

Abstract

The application provides a packaging box printing machine convenient for position positioning applied to the field of packaging box printing equipment, and relates to the technical field of packaging box printing machines. The packaging box printing machine comprises a printing machine body, a printing plate roller, a pressing mechanism, a hanging plate strip, a positioning adjusting mechanism, a locking mechanism, an ink supply roller and a printing roller, the outer wall of the printing plate roller is provided with a radial limiting sliding groove and a pressing groove which are in communication, the T-shaped limiting sliding block of the pressing mechanism is slidingly assembled in the radial limiting sliding groove, the two sides of the pressing strip are provided with a driving groove and an axial hanging plate groove which are in communication, the hanging plate strip is fixed at the two ends of a hanging plate film and is provided with a rack, the worm of the positioning adjusting mechanism is engaged with the rack, the locking mechanism is arranged at the two ends of the printing plate roller and can drive the radial movement of the pressing mechanism, the locking of the hanging plate strip and the tensioning of the hanging plate film are realized, magnetic balls, a tensioning through groove and a clamping structure are arranged in the axial hanging plate groove, a tensioning inserting strip is fixed in the pressing groove, the rotation clamping and independent alignment adjusting of the hanging plate strip can be realized, the printing plate positioning is adjustable, and the packaging box printing machine is suitable for high-precision packaging box printing operation.

Description

Technical Field

[0001] This application relates to the field of packaging box printing equipment, and in particular to a packaging box printing machine that facilitates positioning. Background Technology

[0002] Packaging box printing machines rely on the printing plate film on the printing plate roller and the printing plate to complete the printing of graphics on corrugated cardboard.

[0003] Existing printing presses of the same type mostly use a fixed clamping structure for the plate mounting assembly. After the plate film is assembled, it is difficult to adjust the axial position precisely, which can easily lead to image misalignment and registration errors. This requires multiple disassembly and adjustment, reducing plate change efficiency. At the same time, conventional plate mounting structures cannot stably and evenly tension the plate film, which can easily cause local loosening and bulging of the plate during printing, resulting in uneven ink coverage and affecting the printing quality of packaging boxes. Existing plate mounting assemblies lack the convenience of assembly and operation, and cannot simultaneously meet the requirements of accurate axial alignment, convenient plate mounting, and continuous and stable printing.

[0004] To address these issues, a packaging box printing machine that facilitates precise positioning is proposed. Summary of the Invention

[0005] The purpose of this application is to address the technical problems of insufficient axial positioning accuracy of the printing plate in existing packaging box printing machines, cumbersome adjustment procedures, and poor tension stability of the printing plate. Compared with the prior art, this application provides a packaging box printing machine that facilitates position positioning, including: The printing press body has a paper feeding section and a printing section at its two ends respectively; The printing plate roller is rotatably mounted on the printing section side. One side of the outer wall of the printing plate roller is provided with a connected radial limiting groove and a pressing groove from the inside to the outside. The outer wall of the printing plate roller is provided with a number of annular positioning grooves at equal intervals. The pressing mechanism includes a T-shaped limiting slider that is radially limited and slidably connected in a radial limiting groove. A pressure strip is fixed on the side of the T-shaped limiting slider away from the printing plate roller. The pressure strip fits into the pressure groove. Two sets of driving grooves and axial plate hanging grooves are symmetrically provided on both sides of the pressure strip. The driving groove and the axial plate hanging groove on the same side are connected. The printing plate strip is used to be inserted into the axial printing plate groove. Two printing plate strips are respectively fixed to the first and last ends of the printing plate film. A printing plate is provided on one side of the outer wall of the printing plate film, and a toothed strip is fixed on the side of the printing plate strip away from the printing plate film. The positioning and adjusting mechanism includes two sets of symmetrically arranged worm gears. The worm gears are rotatably connected to corresponding drive slots. A portion of the worm gear extends into the axial mounting slot and meshes with a rack. One end of the worm gear extends to the side wall of one end of the pressure bar and is fixed with a driven gear. The end of the pressure bar is also rotatably connected to a drive gear, which meshes with both sets of driven gears simultaneously. The locking mechanism is located at both ends of the printing plate roller and is used to drive the pressing mechanism to move radially along the printing plate roller, thereby achieving the locking of the plate hanging strip and the tensioning of the plate hanging film. The ink supply roller is rotatably connected to the top of the printing plate roller and is used to coat the printing plate on the surface of the printing film with ink. The impression roller is rotatably connected to the bottom of the printing plate roller and is used to assist the printing plate roller in pressing the paperboard to be printed, so that the ink on the printing plate is coated onto the surface of the paperboard.

[0006] Furthermore, the locking mechanism includes two sets of locking seats symmetrically fixed at both ends of the printing plate roller. Locking bolts are connected to the locking seats through threaded holes, and the end of the T-shaped limiting slider is provided with a locking through hole corresponding to the locking bolt.

[0007] Furthermore, the end of the hanging strip that connects to the hanging film is provided with a circular snap-fit ​​protrusion, and the top side of the circular snap-fit ​​protrusion is provided with an upper locking groove, and the side of the hanging strip away from the upper locking groove is provided with an arc-shaped locking groove.

[0008] Furthermore, the axial mounting slot has a circular locking groove on one side of the opening that mates with the circular locking protrusion, and a locking tongue on one side of the top of the circular locking groove that mates with the locking groove. The axial mounting groove is a strip-shaped groove structure with a fan-shaped cross section. An arc-shaped locking tongue that matches the arc-shaped locking groove is fixed on the side of the axial mounting groove away from the upper locking tongue. The center of the fan-shaped cross section of the axial mounting groove and the center of the arc-shaped locking tongue both coincide with the center of the circular snap-fit ​​groove.

[0009] Furthermore, a number of magnetic balls are rotatably connected to the side wall of the axial plate mounting groove away from the arc-shaped locking tongue. The magnetic balls are equidistantly arranged along the axial direction of the printing plate roller, and the magnetic balls have a magnetic attraction force to attract the plate mounting strip.

[0010] Furthermore, a tensioning groove is provided on the side wall of the axial mounting groove near the magnetic ball. The tensioning groove is connected to the axial mounting groove. A tensioning insert is also fixed in the pressure groove. The tensioning insert is slidably connected in the tensioning groove.

[0011] Furthermore, when the pressure strip retracts to its maximum stroke within the pressure groove, the end of the tensioning insert passes through the tensioning through groove and extends into the axial hanging plate groove to abut against the hanging plate. This causes the hanging plate to be abutted by the tensioning insert and rotate around the circular locking groove to its maximum stroke. At this time, the hanging plate is released from the magnetic attraction of the magnetic ball, and simultaneously the upper locking groove engages with the upper locking tongue, and the arc-shaped locking groove engages with the arc-shaped locking tongue, thus completing the locking of the hanging plate within the axial hanging plate groove.

[0012] Furthermore, the opening of the pressure groove is symmetrically provided with arc-shaped tension groove edges. When the hanging strip rotates away from the magnetic ball to its maximum stroke, the hanging strip stretches the hanging film to abut against the arc-shaped tension groove edge, so that the hanging film is taut and covers the outer wall of the printing roller.

[0013] Furthermore, the distance between the end of the arc-shaped locking tongue and the side wall of the axial hanging groove is equal to the thickness of the hanging strip. When the pressure strip moves away from the pressure groove to its maximum stroke, the hanging strip is inserted into the axial hanging groove, at which time the rack and worm gear form a meshing engagement.

[0014] Compared to existing technologies, the advantages of this application are: This invention features a positioning adjustment mechanism that uses a drive gear to synchronously rotate two sets of driven gears and a worm gear. Through the meshing transmission between the worm gear and the rack, the axial position of the printing plate strip and the printing plate film can be quickly adjusted without the need for repeated disassembly and reassembly of the printing plate for adjustment. This effectively improves the accuracy of image and text alignment and shortens the time required for plate change and debugging.

[0015] The locking mechanism drives the pressing mechanism to move radially, which, together with the tensioning insert, pushes the hanging strip to rotate and lock in place, thus ensuring reliable fixation of the hanging strip. At the same time, it stretches the hanging film evenly and prevents the hanging film from loosening or bulging in some areas during the printing process, ensuring uniform printing pressure and improving the clarity of printed images and text. Attached Figure Description

[0016] Figure 1 This is a front structural diagram of the printing press body proposed in this application; Figure 2 This is a side view of the printing press body proposed in this application; Figure 3 This is a schematic diagram of the structure when the plate-mounting film is wrapped around the printing plate roller as proposed in this application; Figure 4 This is a schematic diagram of the printing plate roller proposed in this application; Figure 5 for Figure 4 Enlarged structural diagram of section A in the middle; Figure 6 This is a schematic diagram of the structure of the hanging strip and its components proposed in this application; Figure 7 for Figure 6 Enlarged structural diagram of section B in the middle; Figure 8 This is a schematic diagram of the printing plate roller and pressing mechanism proposed in this application; Figure 9 This is a schematic diagram of the partial explosion structure of the clamping mechanism proposed in this application; Figure 10 This is a partial cross-sectional schematic diagram of the clamping mechanism proposed in this application; Figure 11 This is a schematic diagram showing the state of the pressure strip when it extends and retracts as proposed in this application; Figure 12 This is a schematic diagram showing the front and rear states of the hanging strip when it is inserted into the axial hanging slot as proposed in this application; Figure 13 This is a schematic diagram showing the state of the hanging strip as it rotates under pressure within the axial hanging groove, as proposed in this application.

[0017] Explanation of the labels in the diagram: 1. Printing press body; 11. Paper feeding section; 12. Printing section; 2. Printing plate roller; 21. Annular spacing positioning groove; 22. Radial limiting slide groove; 23. Pressing groove; 231. Tensioning insert; 232. Arc-shaped tensioning groove edge; 3. Impression roller; 4. Ink supply roller; 5. Clamping mechanism; 51. T-shaped limit slider; 511. Locking through hole; 52. Pressure strip; 53. Axial hanging plate groove; 531. Arc-shaped locking tongue; 532. Circular snap-fit ​​groove; 533. Upper locking tongue; 534. Magnetic ball; 54. Drive groove; 55. Tensioning through groove; 6. Locking mechanism; 61. Locking seat; 62. Locking bolt; 7. Positioning and adjusting mechanism; 71. Worm gear; 711. Driven gear; 72. Drive gear; 8. Mounting strip; 81. Mounting film; 811. Printing plate; 82. Circular snap-fit ​​protrusion; 84. Arc-shaped locking groove; 85. Toothed rack; 86. Upper locking groove. Detailed Implementation

[0018] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0019] Example: This invention provides a packaging box printing machine that facilitates positioning; please refer to [link / reference]. Figure 1 - Figure 13 The printing press includes a printing press body 1, with a paper feeding section 11 and a printing section 12 arranged at both ends of the printing press body 1. The paper feeding section 11 is responsible for continuously conveying the corrugated cardboard to be printed, and the printing section 12 is used to carry printing-related components and complete the cardboard printing operation.

[0020] Please refer to this first. Figure 2 - Figure 10The printing plate roller 2 is rotatably mounted on the side of the printing section 12, serving as a rotating component to support the printing plate. A radially connected radial limiting groove 22 and a pressing groove 23 are formed along the radial direction from the inside to the outside on one side of the outer wall of the printing plate roller 2. The radial limiting groove 22 provides radial sliding guidance for the pressing mechanism 5, and the pressing groove 23 is used to accommodate the pressing strip 52. Several annularly spaced positioning grooves 21 are equidistantly formed on the outer wall of the printing plate roller 2. These annularly spaced positioning grooves 21 can serve as a visual positioning reference for axial adjustment, facilitating the operator to quickly identify and judge the axial offset of the printing plate 811 during plate mounting and adjustment, thus assisting in precise alignment and adjustment.

[0021] Please refer to this first. Figure 8 - Figure 10 The pressing mechanism 5 includes a T-shaped limiting slider 51, which slides radially along the radial limiting groove 22. The T-shaped structure prevents the slider from falling out and ensures sliding stability. A pressure strip 52 is fixed on the side of the T-shaped limiting slider 51 away from the printing plate roller 2. The pressure strip 52 fits into the pressure groove 23 and can move radially synchronously with the T-shaped limiting slider 51. Two sets of driving grooves 54 and axial plate hanging grooves 53 are symmetrically arranged on both sides of the pressure strip 52. The driving groove 54 and the axial plate hanging groove 53 on the same side are interconnected. The driving groove 54 is used to install the positioning adjustment mechanism 7, and the axial plate hanging groove 53 is used to insert and install the plate hanging strip 8.

[0022] Please refer to this first. Figure 6 - Figure 7 Two mounting strips 8 are fixed to the beginning and end of the mounting film 81, which covers the outer wall of the printing roller 2. The printing plate 811 is set on the outside of the mounting film 81, and the printing plate 811 carries the printed image and completes the ink transfer. A rack 85 is fixed on the side of the mounting strip 8 away from the mounting film 81. The rack 85 cooperates with the positioning adjustment mechanism 7 to achieve axial position drive.

[0023] Please refer to this first. Figure 9 - Figure 10The positioning and adjusting mechanism 7 includes two symmetrically arranged worm gears 71. The worm gears 71 are rotatably mounted inside corresponding drive slots 54. Part of the worm gear 71 extends into the axial mounting slot 53 and meshes with a rack 85. One end of the worm gear 71 extends to the side wall of the pressure strip 52 and fixes a driven gear 711. A drive gear 72 is rotatably mounted at the end of the pressure strip 52, and the drive gear 72 meshes with both driven gears 711. In this embodiment, the drive gear 72 adopts an automated drive structure, specifically driven by a servo motor. The servo motor is fixedly mounted at the end of the printing plate roller 2, and works with a conductive slip ring to achieve stable power supply and signal transmission during rotation. An independent control unit is also provided to precisely control the start / stop, speed, and angle of the servo motor, achieving high-precision controllable rotation of the drive gear 72. Operators can control the servo motor through the control unit, which synchronously drives the two sets of driven gears 711 and worm gear 71 to rotate synchronously. Relying on the meshing of the worm gear and rack, the two hanging strips 8 move axially synchronously, accurately adjusting the axial position of the printing plate 811, correcting the image and text offset, and greatly improving the automation and adjustment accuracy of the position adjustment.

[0024] Please refer to this first. Figure 5 The locking mechanism 6 is symmetrically arranged at both ends of the printing plate roller 2. The locking mechanism 6 includes two sets of locking seats 61 symmetrically fixed at both ends of the printing plate roller 2. Locking bolts 62 are connected to the locking seats 61 through threaded holes. The end of the T-shaped limiting slider 51 is provided with a locking through hole 511 corresponding to the locking bolt 62. Rotating the locking bolt 62 can pull the T-shaped limiting slider 51 to retract inward along the radial limiting groove 22, which drives the pressure strip 52 to move radially as a whole, providing power for locking the plate hanging strip 8 and tensioning the plate hanging film 81.

[0025] Please refer to this first. Figure 7 The end of the hanging strip 8 that connects to the hanging film 81 is provided with a circular locking protrusion 82. A locking groove 86 is provided on one side of the top of the circular locking protrusion 82, and an arc-shaped locking groove 84 is provided on the side of the hanging strip 8 away from the locking groove 86. A circular locking groove 532, which matches the circular locking protrusion 82, is provided on one side of the opening of the axial hanging groove 53. An upper locking tongue 533, which mates with the locking groove 86, is provided on one side of the top of the circular locking groove 532. The axial hanging groove 53 is a fan-shaped groove structure. An arc-shaped locking tongue 531, which mates with the arc-shaped locking groove 84, is fixed on the side of the axial hanging groove 53 away from the upper locking tongue 533. The center of the fan-shaped section of the axial hanging groove 53 and the center of the arc-shaped locking tongue 531 coincide with the center of the circular locking groove 532, ensuring that the hanging strip 8 rotates smoothly around the center, with no jamming during the locking process and high alignment accuracy.

[0026] Please refer to this first. Figure 12 - Figure 13A number of magnetic balls 534 are rotatably mounted on the side wall of the axial mounting groove 53 away from the arc-shaped locking tongue 531. The magnetic balls 534 are equidistantly arranged along the axis of the printing roller 2 and have magnetic attraction. After the mounting strip 8 is inserted into the axial mounting groove 53, the magnetic balls 534 attract the mounting strip 8 to achieve temporary positioning, preventing the mounting strip 8 from falling off or shifting during assembly; at the same time, the ball structure reduces the axial sliding resistance of the mounting strip 8, making position adjustment smoother.

[0027] A tensioning groove 55 is provided on the side wall of the axial mounting groove 53 near the magnetic ball 534. The tensioning groove 55 is connected to the axial mounting groove 53. A tensioning insert 231 is fixed inside the pressure groove 23. The tensioning insert 231 is slidably assembled in the tensioning groove 55 and can move forward and backward synchronously with the pressure bar 52 in the radial direction.

[0028] Please refer to this first. Figure 10 - Figure 13 This equipment operates in two stages: a plate-mounting adjustment station and a printing locking station. During plate-mounting adjustment, the pressure bar 52 is at its maximum extension stroke, furthest from the pressure groove 23, and the axial plate-hanging groove 53 is fully open. Two plate-hanging strips 8 are inserted into the axial plate-hanging grooves 53 on both sides. When the pressure bar 52 moves to its maximum extension stroke, the plate-hanging strips 8 are inserted into the axial plate-hanging grooves 53, and the rack 85 and worm gear 71 mesh. The distance between the end of the arc-shaped locking tongue 531 and the side wall of the axial plate-hanging groove 53 is equal to the thickness of the plate-hanging strip 8, ensuring stable insertion and fit of the plate-hanging strip 8. At this time, the plate-hanging strip 8 is temporarily positioned by the magnetic ball bearing 534 adsorbing it. Rotating the drive gear 72 drives the plate-hanging strip 8 to move axially, completing the alignment of the printing plate 811.

[0029] After alignment, switch to the printing locking station. At this time, tighten the locking bolt 62 to drive the T-shaped limit slider 51 and the pressure strip 52 to retract into the pressure groove 23 to the maximum stroke. The tensioning strip 231 moves synchronously with the pressure strip 52, and its end passes through the tensioning groove 55, extends into the axial mounting groove 53, and abuts against the mounting strip 8, pushing the mounting strip 8 to rotate around the circular locking groove 532 to the maximum stroke. At this time, the mounting strip 8 is released from the magnetic attraction of the magnetic ball 534, the upper locking groove 86 engages with the upper locking tongue 533, and the arc-shaped locking groove 84 engages completely with the arc-shaped locking tongue 531, completing the locking of the mounting strip 8 in the axial mounting groove 53.

[0030] When the arc-shaped locking tongue 531 and the arc-shaped locking groove 84 are fully engaged, the hanging strip 8 rotates and shifts, causing the rack 85 to rotate synchronously with the hanging strip 8 and automatically disengage from the worm gear 71. Based on this structural characteristic, when the two hanging strips 8 are misaligned or have inconsistent alignment accuracy, the correctly aligned hanging strip 8 can be moved first to rotate and lock, causing the rack 85 on that side to disengage from the worm gear 71, achieving unilateral locking and fixation. At this time, the positioning adjustment mechanism 7 can maintain normal operation and perform axial fine-tuning and correction on the remaining misaligned hanging strip 8 without overall disassembly and reassembly, achieving independent and precise alignment of both hanging strips 8.

[0031] In addition, during the plate mounting process, assembly deviations can easily occur, such as one side of the rack 85 engaging with the worm 71 while the other side's rack 85 teeth are misaligned and cannot properly mesh. To address this issue, the same adjustment logic can be used: the plate mounting strip 8 on the precisely meshed side is rotated and locked, disengaging the worm 71 from the rack 85 on that side. Then, the drive gear 72 is manipulated to rotate the misaligned worm 71 at the corresponding angle, precisely matching the tooth phase of the rack 85, thus quickly achieving precise meshing between the rack 85 and the worm 71. This structure completely solves the problems of traditional dual-sided synchronous adjustment structures being unable to individually correct errors and having difficulty adapting to tooth misalignment, reducing the difficulty of plate mounting adjustment and effectively improving alignment tolerance and assembly efficiency.

[0032] The pressure groove 23 has symmetrical arc-shaped tension groove edges 232 on both sides of the opening; when the printing plate strip 8 rotates to the maximum stroke, it stretches the printing plate film 81, so that the printing plate film 81 abuts against the arc-shaped tension groove edge 232, so that the printing plate film 81 is evenly tightened and covers the outer wall of the printing plate roller 2, eliminating loose wrinkles.

[0033] During the actual printing operation, the ink supply roller 4 rotates and contacts the surface of the printing plate 811 to evenly coat the ink; the printing plate roller 2 and the impression roller 3 work together to squeeze the paperboard being transported, transferring the graphic ink from the surface of the printing plate 811 to the surface of the paperboard, thus completing the printing of the packaging box.

[0034] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A packaging box printing machine that facilitates positioning, characterized in that, include: The printing press body (1) has a paper feeding section (11) and a printing section (12) at its two ends respectively. The printing plate roller (2) is rotatably mounted on the printing section (12). The outer wall of the printing plate roller (2) is provided with a radially connected radial limiting groove (22) and a pressure groove (23) from the inside to the outside. The outer wall of the printing plate roller (2) is provided with a number of annularly spaced positioning grooves (21) at equal intervals. The pressing mechanism (5) includes a T-shaped limiting slider (51) that is radially limited and slidably connected in the radial limiting groove (22). A pressure strip (52) is fixed on the side of the T-shaped limiting slider (51) away from the printing plate roller (2). The pressure strip (52) fits into the pressure groove (23). Two sets of driving grooves (54) and axial plate hanging grooves (53) are symmetrically provided on both sides of the pressure strip (52). The driving groove (54) on the same side is connected to the axial plate hanging groove (53). The plate hanging strip (8) is used to be inserted into the axial plate hanging groove (53). The two plate hanging strips (8) are respectively fixed at the beginning and end of the plate hanging film (81). The plate hanging film (811) is provided on one side of the outer wall of the plate hanging film (81). The side of the plate hanging strip (8) away from the plate hanging film (81) is fixed with a toothed strip (85). The positioning adjustment mechanism (7) includes two sets of symmetrically arranged worm gears (71). The worm gears (71) are rotatably connected to the corresponding drive grooves (54). A part of the worm gears (71) extends into the axial mounting groove (53) and meshes with the rack (85). One end of the worm gears (71) extends to the side wall of one end of the pressure strip (52) and is fixed with a driven gear (711). The end of the pressure strip (52) is also rotatably connected with a drive gear (72). The drive gear (72) meshes with both sets of driven gears (711) at the same time. The locking mechanism (6) is located at both ends of the printing plate roller (2) and is used to drive the pressing mechanism (5) to move radially along the printing plate roller (2), thereby achieving the locking of the hanging strip (8) and the tightening of the hanging film (81). The ink supply roller (4) is rotatably connected to the top of the printing plate roller (2) and is used to coat the printing plate (811) on the surface of the plate film (81) with ink. The impression roller (3) is rotatably connected to the bottom of the printing plate roller (2) and is used to assist the printing plate roller (2) in squeezing the paperboard to be printed so that the ink on the printing plate (811) is coated on the surface of the paperboard.

2. The packaging box printing machine for easy positioning according to claim 1, characterized in that, The locking mechanism (6) includes two sets of locking seats (61) symmetrically fixed at both ends of the printing plate roller (2). The locking seats (61) are connected to locking bolts (62) through threaded holes. The end of the T-shaped limit slider (51) is provided with locking through holes (511) corresponding to the locking bolts (62).

3. The packaging box printing machine for easy positioning according to claim 1, characterized in that, The end of the hanging strip (8) that connects to the hanging film (81) is provided with a circular snap-fit ​​protrusion (82), and the top side of the circular snap-fit ​​protrusion (82) is provided with an upper locking groove (86). The side of the hanging strip (8) away from the upper locking groove (86) is provided with an arc-shaped locking groove (84).

4. A packaging box printing machine for easy positioning according to claim 3, characterized in that, The axial mounting groove (53) has a circular snap-fit ​​groove (532) on one side of the opening that matches the circular snap-fit ​​protrusion (82), and the top side of the circular snap-fit ​​groove (532) has an upper locking tongue (533) that matches the upper locking groove (86). The axial mounting groove (53) is a strip groove structure with a fan-shaped cross section. An arc-shaped locking tongue (531) that matches the arc-shaped locking groove (84) is fixed on the side of the axial mounting groove (53) away from the upper locking tongue (533). The center of the fan-shaped cross section of the axial mounting groove (53) and the center of the arc-shaped locking tongue (531) coincide with the center of the circular snap-fit ​​groove (532).

5. A packaging box printing machine for easy positioning according to claim 4, characterized in that, On the side wall away from the arc-shaped locking tongue (531) of the axial plate mounting groove (53), a number of magnetic balls (534) are rotatably connected. The magnetic balls (534) are equidistantly arranged along the axial direction of the printing plate roller (2). The magnetic balls (534) have magnetic attraction to attract the plate mounting strip (8).

6. A packaging box printing machine for easy positioning according to claim 5, characterized in that, The axial mounting groove (53) is also provided with a tensioning groove (55) on the side wall near the magnetic ball (534). The tensioning groove (55) is connected to the axial mounting groove (53). A tensioning insert (231) is also fixed in the pressure groove (23). The tensioning insert (231) is slidably connected in the tensioning groove (55).

7. A packaging box printing machine for easy positioning according to claim 6, characterized in that, When the pressure strip (52) retracts to its maximum stroke in the pressure groove (23), the end of the tensioning insert (231) passes through the tensioning through groove (55) and extends into the axial hanging plate groove (53) to abut against the hanging plate (8), so that the hanging plate (8) is abutted by the tensioning insert (231) and rotates around the circular snap-fit ​​groove (532) to its maximum stroke. At this time, the hanging plate (8) is released from the magnetic attraction of the magnetic ball (534), and at the same time, the upper locking groove (86) engages with the upper locking tongue (533) and the arc-shaped locking groove (84) engages with the arc-shaped locking tongue (531), thus completing the locking of the hanging plate (8) in the axial hanging plate groove (53).

8. A packaging box printing machine for easy positioning according to claim 7, characterized in that, The opening of the pressure groove (23) is also symmetrically provided with arc-shaped tension groove edges (232). When the hanging strip (8) rotates away from the magnetic ball (534) to the maximum stroke, the hanging strip (8) stretches the hanging film (81) to abut against the arc-shaped tension groove edge (232), so that the hanging film (81) is stretched and covered on the outer wall side of the printing roller (2).

9. A packaging box printing machine for easy positioning according to claim 5, characterized in that, The distance between the end of the arc-shaped locking tongue (531) and the side wall of the axial hanging groove (53) is equal to the thickness of the hanging strip (8). When the pressure strip (52) moves away from the pressure groove (23) to the maximum stroke, the hanging strip (8) is inserted into the axial hanging groove (53). At this time, the rack (85) and the worm (71) form a meshing engagement.

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