High-definition accurate overprinting equipment of printing machine

Abstract

The utility model relates to the technical field of printing mechanical equipment, and discloses printing machine high-definition accurate overprinting equipment which comprises a machine body and a printing plate arranged at the top in the machine body, a paper inlet is formed in the front end of the machine body in the paper printing conveying direction, and a conveying table used for supporting paper is arranged on the side, close to the paper inlet, of the machine body in an extending mode. The conveying table and the inner bottom wall at the paper inlet of the machine body are arranged at the same height, and a tensioning mechanism is arranged at the front end of the paper inlet on the conveying table; the tensioning mechanism comprises two supporting plates vertically arranged on the opposite side walls of the conveying table, a pressing and conveying roller horizontally and rotationally arranged between the two supporting plates and an adjusting piece for adjusting the distance between the pressing and conveying roller and the conveying table, and the two supporting plates are distributed in the direction perpendicular to the paper printing conveying direction. A limiting mechanism is arranged on the side, away from the machine body, of the pressing and conveying roller on the conveying table in the paper printing conveying direction. The method has the effect of improving the overprinting accuracy of the printing machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing machinery equipment, in particular to a high-definition accurate overprint equipment of a printing machine. BACKGROUND

[0002] Overprint printing is a multi-color printing technology that prints different colors on paper or other substrates to achieve multi-color effects. This technology is commonly used for printed matter that requires high-precision color matching and complex patterns, such as books, magazines, posters, and packaging materials. The key to overprint printing is to accurately align the printing of different colors to ensure that each color layer is accurately superimposed at the predetermined position to form a clear and accurate image.

[0003] Existing printing equipment usually controls the deformation of paper during the printing process through pre-set pressure adjustment devices, heating and shaping mechanisms, and complex correction algorithms. However, these traditional methods often rely on manual experience to set parameters and have poor adaptability, which limits their effectiveness when dealing with different types and thicknesses of paper. In addition, traditional printing equipment is prone to cumulative errors during long-term continuous operation, which affects the quality of the final product.

[0004] Chinese Patent No. CN220844776U discloses a positioning and conveying device for paper overprint, which includes a printing machine, an entry port at the front end of the printing machine, and a tensioning mechanism. The tensioning mechanism includes a first flip plate and a conveying roller, the first flip plate is movably installed at the front end of the printing machine, the conveying roller is rotatably installed between the first flip plates, and the second flip plate is movably installed on one side of the conveying roller and cooperates with the conveying roller.

[0005] The overprint device described above only uses a set of suspended conveying rollers to achieve clamping and tensioning of the paper by manually rotating the gears during the process of the paper entering the printing machine. However, the paper is not fully supported during this process, so the part of the paper that has not passed through the gap between the conveying rollers is prone to deformation due to gravity or air flow. When the deformed paper passes through the gap between the conveying rollers and is tensioned, the likelihood of paper creases greatly increases. Finally, the paper with creases may result in inaccurate color overprint after overprint in the printing machine. Moreover, the paper with creases may be further damaged, such as tearing, breaking, or generating more creases, when passing through the printing plate of the printing machine. Content of the utility model

[0006] In order to improve the accuracy of overprint of the printing machine, the present application provides a high-definition accurate overprint equipment of a printing machine.

[0007] The high-definition accurate overprint equipment of a printing machine provided by the present application adopts the following technical solution:

[0008] The application discloses a high-precision register printing device of a printing machine, which comprises a machine body and a printing plate arranged on the top of the machine body, wherein the machine body is provided with a paper inlet at the front end along the paper printing conveying direction, and a conveying table for supporting the paper is arranged on the side of the machine body close to the paper inlet and is arranged at the same height with the inner bottom wall at the paper inlet of the machine body, a tensioning mechanism is arranged on the conveying table at the front end of the paper inlet, the tensioning mechanism comprises two support plates arranged vertically on the opposite side walls of the conveying table, a pressing roller arranged horizontally and rotatably between the two support plates and an adjusting member for adjusting the height of the pressing roller relative to the conveying table, the two support plates are arranged along the direction perpendicular to the paper printing conveying direction, and a limiting mechanism is arranged on the side of the conveying table away from the machine body along the paper printing conveying direction.

[0009] By adopting the above technical scheme, the conveying table is used for fully supporting the paper, and the pressing roller is adjusted to a proper height according to the thickness of the paper by the adjusting member, so that the paper can obtain a tensioning force when entering the printing machine, and the deformation of the paper caused by gravity or air flow can be avoided under the cooperation of the conveying table and the pressing roller, thereby effectively reducing the possibility of paper creases.

[0010] Optionally, the pressing roller comprises a supporting shaft and a rotating sleeve rotatably arranged on the supporting shaft, the end of the supporting shaft extends out of the side wall opposite to the support plate and is slidably connected to the support plate in the vertical direction, the adjusting member comprises a screw rod rotatably arranged on the side wall of the machine body in the vertical direction, a driving block threadedly rotatably arranged on the screw rod, a first connecting rod connecting the driving block on the same side and the end of the supporting shaft and a servo motor for driving the screw rod to rotate.

[0011] By adopting the above technical scheme, the servo motor is started to work, so as to drive the screw rod to rotate, the rotation of the screw rod drives the driving block arranged on the side wall of the machine body to realize the lifting movement, the lifting movement of the driving block synchronously drives the supporting shaft to realize the lifting movement on the support plate through the first connecting rod, so as to accurately control the position of the pressing roller according to the thickness of the printing paper, to ensure that the paper can obtain stable and uniform tension when entering the printing machine, to reduce the possibility of paper creases in the subsequent printing process, and to improve the printing register accuracy.

[0012] Optionally, the body is provided with a guide column vertically on each side of the printing plate, and the two guide columns are distributed along a direction perpendicular to the conveying direction of the paper, and the guide column is provided with a cavity, and the guide column is provided with a supporting column slidingly fitted in the cavity, and the side wall of the printing plate is provided with a slide bar horizontally corresponding to each guide column, and the end of the slide bar is inserted into the guide column, and the end of the slide bar in the cavity of the guide column is provided with a supporting column slidingly fitted, and the supporting column is above the supporting column in the same guide column, and the supporting column and the driving block on the side away from the printing plate are connected by a second connecting rod, and the second connecting rod is provided through the side wall of the body and the guide column, and is slidingly fitted vertically with the side wall of the body and the guide column.

[0013] By adopting the above technical scheme, under the driving of the driving block and the second connecting rod, the supporting column can be adjusted in height synchronously with the pressure roller, so that the final printing pressure of the printing plate is adaptively adjusted according to the thickness of the paper to be overprinted together with the pressure roller, thereby avoiding excessive pressure causing deformation of the paper. At the same time, under the guidance of the guide column, the printing pressure can be ensured to be uniform, thereby avoiding excessive local pressure and improving the printing precision and quality.

[0014] Optionally, the cavity of the guide column is provided with a stabilizing spring, and the stabilizing spring is located between the supporting column and the supporting column, and the bottom end of the stabilizing spring is fixedly connected with the supporting column.

[0015] By adopting the above technical scheme, the printing plate works downward, thereby overprinting the paper. During the downward pressing of the printing plate, the printing plate drives the supporting column to slide downward in the guide column through the slide bar, until the slide bar contacts the stabilizing spring and the stabilizing spring is deformed, until the printing plate overprints the pattern on the paper. The stabilizing spring provides a buffering force during the overprinting process of the printing plate on the paper, thereby reducing the possibility of damage to the paper to be overprinted by the printing plate, and reducing the occurrence of the offset of the printing plate, improving the flatness of the paper during the printing process, and thereby improving the overprinting precision.

[0016] Optionally, the limiting mechanism comprises two limiting plates slidingly arranged on the conveying table and a driving member driving the two limiting plates to slide relative to each other, and the two limiting plates slide along a direction perpendicular to the conveying direction of the paper, and the opposite sides of the two limiting plates are provided with limiting rollers rotatingly arranged.

[0017] By adopting the technical scheme, the distance between the two limiting plates is adjusted according to the width of the paper to be overprinted, and the friction generated by the contact between the paper and the limiting roller during the transmission of the paper is reduced by rotating the limiting roller, so that the accurate limiting and guiding of the two sides of the paper are realized, the possibility of lateral deviation of the paper during the transmission is effectively reduced, and the possibility of damage caused by the total wrinkle of the paper during the transmission is further reduced, thereby improving the printing accuracy of the overprint equipment.

[0018] Optionally, the bottom wall of the limiting plate is provided with a guide block, the conveying table is provided with a guide groove in the sliding direction of the guide block, the guide block and the guide groove are in sliding fit, the driving member includes a gear rotatingly arranged at the bottom of the conveying table, a rack in meshing connection with the gear, and a reciprocating motor driving the gear to rotate, the rack is provided with one corresponding to each guide block, and the two racks are arranged on the two sides of the rack axis direction in parallel to the guide groove, and when the gear rotates, the two racks in meshing connection with the gear drive the guide blocks to slide relatively.

[0019] By adopting the technical scheme, when the gear rotates, the two racks in meshing connection with the gear drive the guide blocks to slide relatively, so that the distance between the two limiting plates is adjusted according to the width of the paper to be overprinted. The accurate limiting of the paper is realized, the deviation of the paper during the transmission is effectively prevented, and the printing accuracy of the overprint equipment is improved.

[0020] Optionally, the bottom wall of the conveying table is provided with a limiting ring for the rack to slide through, and the limiting ring is provided with one corresponding to each rack.

[0021] By adopting the technical scheme, the limiting ring can make the rack stable during sliding, improve the accuracy of the relative sliding of the limiting plate, and further improve the stability of the paper during the conveying process, reduce the possibility of deviation of the paper during the conveying process, and further improve the accuracy of the overprint of the paper during the printing process.

[0022] Optionally, a scale mark is arranged on the outer side wall of the body in parallel to the lead screw, the scale mark is located on one side of the lead screw, and the scale range of the scale mark is matched with the height adjustment range of the corresponding driving block.

[0023] By adopting the technical scheme, the scale mark can directly display the position of the driving block on the lead screw, so as to facilitate the operator to accurately adjust the distance between the pressure roller and the conveying table, thereby improving the tension and stability of the paper during the printing process, reducing the printing error caused by improper tension, and improving the printing quality.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The conveying table is used for fully supporting the paper, and the compression roller adjusts the appropriate height according to the thickness of the paper by the adjusting member, so that the paper can obtain the tension force when entering the printing machine, and the deformation of the paper caused by gravity or air flow can be avoided under the cooperation of the conveying table and the compression roller, thereby effectively reducing the possibility of paper creases; meanwhile, the limiting mechanism also provides deviation correction and guidance for the direction of the paper in the conveying process, which not only reduces the possibility of color overprint inaccuracy caused by deviation, but also improves the accuracy of the printing machine overprint;

[0026] 2. The servo motor is started to work, thereby driving the screw rod to rotate, the rotation of the screw rod drives the driving block on the outer wall of the body to realize the lifting movement, the lifting movement of the driving block synchronously drives the support shaft to realize the lifting movement on the support plate, thereby realizing the accurate control of the position of the compression roller according to the thickness of the overprint paper, ensuring that the paper can obtain stable and uniform tension when entering the printing machine, reducing the possibility of paper creases in the subsequent printing process, thereby improving the printing overprint accuracy;

[0027] 3. Under the driving of the driving block and the second connecting rod, the supporting column can be adjusted in height synchronously with the compression roller, so that the final printing pressure of the printing plate is adaptively adjusted according to the thickness of the overprint paper together with the compression roller, thereby avoiding the paper compression deformation caused by excessive pressure. At the same time, under the guidance of the guide column, it can ensure that the printing pressure is uniform, thereby avoiding excessive local pressure, improving the printing precision and quality. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structure schematic diagram of the embodiment of the application.

[0029] Figure 2 is the sectional view of the embodiment of the application, which embodies the internal structure of the body.

[0030] Figure 3 is the schematic diagram of the embodiment of the application, which embodies the connection relationship between the guide block, the gear and the rack.

[0031] BRIEF DESCRIPTION OF DRAWINGS:

[0032] 1, body; 11, paper inlet; 12, scale mark; 2, printing plate; 3, conveying table; 31, guide groove; 32, limiting ring; 4, tensioning mechanism; 41, support plate; 42, pressure roller; 421, support shaft; 422, rotating sleeve; 43, adjusting piece; 431, screw rod; 432, driving block; 433, first connecting rod; 434, servo motor; 5, limiting mechanism; 51, limiting plate; 511, guide block; 52, driving piece; 521, gear; 522, rack; 523, reciprocating motor; 6, limiting roller; 7, guide column; 71, supporting column; 711, second connecting rod; 72, supporting column; 721, sliding rod; 8, stabilizing spring. DETAILED DESCRIPTION

[0033] The following description will be made in conjunction with the accompanying drawings. Figures 1-3 The application is further described in detail.

[0034] The application discloses a printing machine high-definition accurate overprint device.

[0035] Referring to Figure 1 and Figure 2 , the printing machine high-definition accurate overprint device comprises a body 1 and a printing plate 2, and the printing plate 2 is arranged on the inner top of the body 1 in a lifting manner. The front end of the body 1 along the paper printing conveying direction is provided with a paper inlet 11, and the side of the body 1 close to the paper inlet 11 is fixedly provided with a conveying table 3 extending, the conveying table 3 is used for supporting and conveying paper, and the conveying table 3 is arranged at the same height with the inner bottom wall of the body 1 at the paper inlet 11. The conveying table 3 is provided with a tensioning mechanism 4 at the front end of the paper inlet 11, and the conveying table 3 is provided with a limiting mechanism 5 on the side away from the body 1 along the paper printing conveying direction.

[0036] Referring to Figure 1 and Figure 2 , when the overprint device overprints the paper, the paper first passes through the limiting mechanism 5 in the conveying process, the limiting mechanism 5 guides and corrects the paper on both sides along the conveying direction perpendicular to the paper printing; then passes through the space between the conveying table 3 and the tensioning mechanism 4, and the conveying table 3 and the tensioning mechanism 4 cooperate to provide stable support and tensioning force for the paper; finally, the paper enters the body 1 from the paper inlet 11, is overprinted by the printing plate 2, and is output from the body 1.

[0037] Referring to Figure 1 and Figure 3 , the limiting mechanism 5 comprises a limiting plate 51 and a driving piece 52, the two limiting plates 51 are arranged in a relative sliding manner along the conveying direction perpendicular to the paper, and the opposite sides of the two limiting plates 51 are both rotationally provided with a limiting roller 6. The conveying table 3 is provided with a guide groove 31 corresponding to the sliding direction of the limiting plate 51, and the bottom of each limiting plate 51 is fixedly provided with a guide block 511 which is in sliding cooperation with the guide groove 31.

[0038] With reference to Figure 3 , the driving member 52 comprises a gear 521, a rack 522 and a reciprocating motor 523, the reciprocating motor 523 is located at the middle position of the limiting groove, is fixedly arranged on the bottom wall of the conveying table 3, the gear 521 is fixedly arranged on the output shaft of the reciprocating motor 523, and the rack 522 is provided with one corresponding to each guide block 511. Two racks 522 are arranged on both sides of the rack 522 axis direction parallel to the guide groove 31, and are meshed with the gear 521.

[0039] With reference to Figure 3 , the bottom wall of the conveying table 3 is fixedly provided with a limiting ring 32 for the rack 522 to slide through, and the limiting ring 32 is provided with one corresponding to each rack 522. When the gear 521 rotates, the two racks 522 meshed with it are limited by the limiting ring 32, and drive the guide block 511 to slide relatively.

[0040] With reference to Figure 1 , the tensioning mechanism 4 comprises a support plate 41, a pressure roller 42 and an adjusting member 43. The support plate 41 is vertically arranged and distributed with two along the vertical direction of the paper printing conveying direction, and is fixedly arranged on the side walls of the conveying table 3 away from each other. The pressure roller 42 comprises a support shaft 421 and a rotating sleeve 422. The support shaft 421 is arranged between the two support plates 41 along the horizontal direction, and the end of the support shaft 421 penetrates through the support plate 41 and extends out of the side wall of the support plate 41 away from each other, and is in sliding fit with the support plate 41 along the vertical direction. The pressure roller 42 is located between the two support plates 41, and the rotating sleeve 422 is arranged on the support shaft 421.

[0041] With reference to Figure 1 , the adjusting member 43 comprises a lead screw 431, a driving block 432, a first connecting rod 433 and a servo motor 434. The lead screw 431 is arranged on the side wall of the machine body 1 on the same side of the end of the support shaft 421 and rotates along the vertical direction. The driving block 432 is attached to the outer side wall of the machine body 1 and is arranged on the lead screw 431 by thread rotating sleeve 422. The first connecting rod 433 is fixedly connected between the driving block 432 on the same side and the end of the support shaft 421 along the horizontal direction. The servo motor 434 is located below the lead screw 431 and is fixedly arranged on the outer side wall of the machine body 1. The output shaft of the servo motor 434 is coaxially fixedly connected with the lead screw 431.

[0042] With reference to Figure 1 , a scale mark 12 is electroplated on the outer side wall of the machine body 1 parallel to the lead screw 431. The scale mark 12 is located on one side of the lead screw 431, and the scale range of the scale mark 12 is matched with the height adjustment range of the corresponding driving block 432.

[0043] With reference to Figure 2The body 1 is provided with a guide column 7 on each side of the printing plate 2 in the vertical direction. The two guide columns 7 are distributed in the direction perpendicular to the paper printing direction, and the guide column 7 is provided with a cavity. The support column 72 and the supporting column 72 are slidably arranged in the cavity of the guide column 7. The supporting column 72 is located below the supporting column 72. The stable spring 8 is arranged in the cavity of the guide column 7, and the stable spring 8 is located between the supporting column 72 and the supporting column 71. The bottom end of the stable spring 8 is fixedly connected with the supporting column 72.

[0044] Referring to Figure 2 The second connecting rod 711 is fixedly connected between the supporting column 71 and the driving block 432 on the side away from the printing plate 2. The second connecting rod 711 penetrates the side wall of the body 1 and the guide column 7, and is in vertical sliding fit with the side wall of the body 1 and the guide column 7.

[0045] Referring to Figure 2 The horizontal slide rod 721 is fixedly arranged between the side wall of the printing plate 2 and the supporting column 72. The end of the slide rod 721 is inserted into the guide column 7, and is in vertical sliding fit with the guide column 7.

[0046] The implementation principle of the printing machine high-precision overprint equipment according to the embodiment of the application is as follows: before the overprint equipment works, the thickness and width parameters of the paper are understood, and the distance between the two limiting plates 51 and the height of the pressure roller 42 are adjusted as needed. The reciprocating motor 523 is started to drive the gear 521 to rotate. When the gear 521 rotates, the two racks 522 engaged with the gear 521 drive the guide block 511 to slide relatively, so that the distance between the two limiting plates 51 is adjusted according to the width of the paper to be overprinted.

[0047] The servo motor 434 is started to work, so that the screw rod 431 is driven to rotate, the rotation of the screw rod 431 drives the driving block 432 fitted on the outer side wall of the body 1 to realize lifting movement, and the lifting movement of the driving block 432 synchronously drives the supporting shaft 421 on the supporting plate 41 to realize lifting movement, so that the position of the pressure roller 42 is accurately controlled according to the thickness of the paper to be overprinted.

[0048] Under the synchronous driving of the driving block 432 and the second connecting rod 711, the supporting column 71 can be adjusted in height synchronously with the pressure roller 42, so that the final printing pressure of the printing plate 2 is adaptively adjusted according to the thickness of the paper to be overprinted together with the pressure roller 42.

[0049] Therefore, the paper is first guided by the two limiting plates 51 to enter between the conveying table 3 and the pressure roller 42 in the conveying process, and is stably supported and effectively tensioned under the cooperation of the conveying table 3 and the pressure roller 42. Then the paper enters the body 1 from the paper inlet 11, is overprinted by the printing plate 2, and is finally output from the body 1.

[0050] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A printing machine high-precision register equipment, comprising a machine body (1) and a printing plate (2) arranged on the top of the machine body (1), the machine body (1) is provided with a paper inlet (11) at the front end along the paper printing conveying direction, and a conveying table (3) for supporting the paper is arranged on the side of the machine body (1) close to the paper inlet (11), the conveying table (3) is arranged at the same height between the inner bottom wall of the machine body (1) at the paper inlet (11), and a tensioning mechanism (4) is arranged on the front end of the conveying table (3) located at the paper inlet (11), the tensioning mechanism (4) comprises two support plates (41) arranged vertically on the opposite side walls of the conveying table (3), a pressing roller (42) arranged horizontally and rotatably between the two support plates (41), and an adjusting member (43) for adjusting the height of the pressing roller (42) from the conveying table (3), the two support plates (41) are distributed along the vertical direction of the paper printing conveying direction, and a limiting mechanism (5) is arranged on the side of the conveying table (3) away from the machine body (1) along the paper printing conveying direction.

2. A high register overprint apparatus for a printing press according to claim 1, wherein The pressing roller (42) comprises a support shaft (421) and a rotating sleeve (422) arranged on the support shaft (421), the end of the support shaft (421) extends out of the side wall away from the support plate (41) and is vertically slidingly connected with the support plate (41), the adjusting member (43) comprises a lead screw (431) arranged vertically on the side wall of the machine body (1), a driving block (432) arranged on the lead screw (431) by screwing the rotating sleeve (422), a first connecting rod (433) connecting the driving block (432) and the end of the support shaft (421) on the same side, and a servo motor (434) driving the lead screw (431) to rotate.

3. A high register overprint apparatus for a printing press as claimed in claim 2, characterized in that The machine body (1) is provided with a guide column (7) vertically arranged on the side of the printing plate (2) away from the machine body (1), the two guide columns (7) are distributed along the vertical direction of the paper printing conveying direction, the guide column (7) is provided with a cavity, and a supporting column (71) is slidingly arranged in the cavity of the guide column (7), a sliding rod (721) is horizontally arranged on the side wall of the printing plate (2) corresponding to each guide column (7), the end of the sliding rod (721) is inserted into the guide column (7), and a supporting column (72) is slidingly arranged at the end of the sliding rod (721) in the cavity of the guide column (7), the supporting column (72) is above the supporting column (71) in the same guide column (7), a second connecting rod (711) is connected between the supporting column (71) and the driving block (432) away from the printing plate (2), the second connecting rod (711) penetrates the side wall of the machine body (1) and the guide column (7), and is vertically slidingly connected with the side wall of the machine body (1) and the guide column (7).

4. A high register overprint apparatus for a printing press according to claim 3, wherein A stabilizing spring (8) is arranged in the cavity of the guide column (7), the stabilizing spring (8) is located between the supporting column (72) and the supporting column (71), and the bottom end of the stabilizing spring (8) is fixedly connected with the supporting column (72).

5. The high register printing press of claim 1 wherein The limiting mechanism (5) comprises two limiting plates (51) slidingly arranged on the conveying table (3) and a driving member (52) driving the two limiting plates (51) to slide relative to each other, the two limiting plates (51) slide along a direction perpendicular to the conveying direction of the paperboard, and the opposite sides of the two limiting plates (51) are rotationally arranged with limiting rollers (6).

6. A high register printing press according to claim 5 wherein The bottom wall of the limiting plate (51) is provided with a guide block (511), the conveying table (3) is provided with a guide groove (31) corresponding to the sliding direction of the guide block (511), the guide block (511) and the guide groove (31) are in sliding fit, the driving member (52) comprises a gear (521) rotationally arranged at the bottom of the conveying table (3), a rack (522) in meshing arrangement with the gear (521), and a reciprocating motor (523) driving the gear (521) to rotate, the rack (522) is provided with one corresponding to each guide block (511), and the two racks (522) are arranged on both sides of the rack (522) axis direction in parallel to the guide groove (31), when the gear (521) rotates, the two racks (522) in meshing arrangement with the gear (521) drive the guide block (511) to slide relative to each other.

7. A high register overprint apparatus for a printing press according to claim 6, wherein The bottom wall of the conveying table (3) is provided with a limiting ring (32) for the rack (522) to slide through, and the limiting ring (32) is provided with one corresponding to each rack (522).

8. The high register printing press of claim 1 wherein The outer side wall of the machine body (1) is provided with a scale mark (12) parallel to the lead screw (431), the scale mark (12) is located on one side of the lead screw (431), and the scale range of the scale mark (12) matches the height adjustment range of the corresponding driving block (432).

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