Paper pressing device and jet printing assembly

Abstract

The embodiment of the utility model provides a paper pressing device and a jet printing assembly. The paper pressing device is used in cooperation with a jet printing assembly with a jet printing frame and comprises a pressing plate, a back plate fixed to the jet printing assembly, a plurality of hinges, a pair of first springs and a plurality of second springs. The pressing plate is hinged to the back plate through a hinge so that the pressing plate can rotate relative to the back plate. One side, far away from the back plate, of the pressing plate corresponds to the mounting position of the jet printing frame; any tail end of each first spring is connected to the pressing plate, and the other tail end of each first spring is connected to the jet printing assembly; the two tail ends of each second spring are connected to the back plate and the pressing plate respectively, so that an included angle is formed between the back plate and the pressing plate; and when the pressing plate is pressed by the jet printing frame, the jet printing frame drives the side, away from the back plate, of the pressing plate to descend, so that the pressing plate flattens the corrugated board located below the jet printing frame. According to the paper pressing device, the flatness of the corrugated board can be improved, the printing quality and the printing efficiency of the jet printing assembly can be improved, and the printing cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inkjet printing equipment, in particular to a paper pressing device and an inkjet printing component. Background Art

[0002] Inkjet printing technology is widely used in the corrugated cardboard printing industry. This application places extremely high demands on the flatness of the corrugated cardboard. However, existing printing assemblies suitable for corrugated cardboard are often blocked by the base plate mounted on the printing frame when printing on warped corrugated cardboard. This prevents the cardboard from entering the designated printing position, causing paper jams and low printing efficiency.

[0003] Therefore, in order to prevent the nozzle installed on the base plate from being damaged by the warped corrugated cardboard, the flatness of the corrugated cardboard is required to be very high during the printing process. Therefore, in the absence of any measures, it is necessary to ensure that the corrugated cardboard can achieve a very high flatness in its initial state.

[0004] At the same time, if the corrugated cardboard is warped, since the printing component has a nozzle protection mechanism, the nozzle will be raised for printing due to sensing the warping of the corrugated cardboard, resulting in different distances between the corrugated cardboard and the nozzle at different positions, resulting in different printing states on the same corrugated cardboard; for example, one part of the corrugated cardboard has ink floating phenomenon (that is, the part where the nozzle is farther away from the corrugated cardboard), and the other part has rubbing phenomenon (that is, the part where the nozzle is closer to the corrugated cardboard).

[0005] Most of the current solutions involve pre-treating the corrugated cardboard itself; for example, humidifying the corrugated cardboard before printing and then drying it to flatten it; such pre-treatment makes the process more complicated and the cost of the pre-treatment is high.

[0006] However, in the process of implementing the embodiments of the present invention, the inventors found that when the corrugated cardboard is warped, the warped corrugated cardboard is likely to collide with the nozzle when the printing frame drives the pressure plate and the nozzle to move, thereby causing damage to the nozzle and increasing the printing cost; at the same time, the unevenness of the corrugated cardboard will also lead to poor printing quality. Utility Model Content

[0007] The paper pressing device and printing assembly provided by the utility model are intended to solve the technical problems of the existing printing assembly suitable for corrugated cardboard, such as poor printing quality, high printing cost and low printing efficiency caused by the warping of the corrugated cardboard.

[0008] In a first aspect, the present invention provides a paper pressing device. The paper pressing device is used in conjunction with a printing assembly having a printing frame; the paper pressing device includes:

[0009] A pressure plate, a back plate, a plurality of hinges, a pair of first springs, and a plurality of second springs; the back plate is fixedly mounted on at least a portion of the printing assembly;

[0010] The pressing plate is hinged to the back plate via a plurality of hinges, so that the pressing plate can rotate relative to the back plate; a side of the pressing plate away from the back plate corresponds to the installation position of the printing frame;

[0011] Either end of each of the first springs is connected to the pressure plate, and the other end of each of the first springs is connected to a portion of the printing assembly;

[0012] The two ends of each second spring are respectively connected to the back plate and the pressure plate, so that an angle is formed between the back plate and the pressure plate; the first spring and the second spring both have an elastic force that drives the angle to be equal to 90 degrees;

[0013] When the pressing plate is pressed by the printing frame, the printing frame drives the pressing plate to descend away from one side of the back plate and overcomes the elastic force so that the pressing plate flattens the corrugated cardboard below the printing frame.

[0014] In some embodiments, the pressure plate comprises:

[0015] a first body and a first supporting portion extending along a first direction;

[0016] The first support portion is provided on the surface of the first body; a pair of first springs are symmetrically provided on two opposite sides of the first body in the first direction;

[0017] One side of the first body in the second direction is connected to a portion of the hinge; the other side of the first body in the second direction is provided with a contact portion, and the contact portion corresponds to the installation position of the printing frame;

[0018] The first direction is the length direction of the first body, and the second direction is the width direction of the first body.

[0019] In some embodiments, the first support member comprises:

[0020] a first base plate and a first vertical plate;

[0021] The first substrate is attached to the surface of the first body; the first vertical plate is vertically arranged at the edge of the first substrate and protrudes from the surface of the first substrate;

[0022] The first vertical plate is provided with a plurality of first mounting holes arranged along the first direction, and each of the first mounting holes can be connected to any end of each of the second springs.

[0023] In some embodiments, the backplane comprises:

[0024] a second body and a second supporting portion extending along a third direction; the second supporting portion is provided on a surface of the second body;

[0025] One side of the second body in the fourth direction is fixedly mounted on at least a portion of the printing assembly; the other side of the second body in the fourth direction is connected to another portion of the hinge;

[0026] The third direction is the length direction of the second body, the fourth direction is the direction in which the printing frame descends or ascends, and the third direction and the fourth direction are orthogonal to each other.

[0027] In some embodiments, the second support portion comprises:

[0028] a second base plate and a second vertical plate;

[0029] The second substrate is attached to the surface of the second body; the second vertical plate is vertically arranged at the edge of the second substrate and protrudes from the surface of the second substrate;

[0030] The second vertical plate is provided with a plurality of second mounting holes arranged along the third direction, and each of the second mounting holes can be connected to the other end of each of the second springs.

[0031] In some embodiments, when the printing frame rises, the first spring and the second spring provide the elastic force to drive the pressure plate to rise away from one side of the back plate. At this time, the pressure plate and the back plate are perpendicular to each other, and the angle is equal to 90 degrees.

[0032] In some embodiments, when the side of the pressing plate away from the back plate abuts against the surface of the corrugated cardboard under the pressure of the printing frame, the first substrate is inclined relative to the surface of the corrugated cardboard so that the first substrate and the surface of the corrugated cardboard form a trumpet-shaped opening.

[0033] In a second aspect, the present invention provides a printing assembly. The printing assembly at least comprises:

[0034] N printing frames, a machine frame and the above-mentioned paper pressing device;

[0035] The paper pressing device is arranged in front of the first printing frame, and a paper guide rear pressing plate is arranged in front of the second printing frame to the Nth printing frame;

[0036] The corrugated cardboard passes through the first printing frame, the second printing frame and the Nth printing frame in sequence;

[0037] Wherein, N printing frames are fixedly installed on the frame, and N is an integer greater than 1.

[0038] In some embodiments, the printing assembly further comprises:

[0039] N base plates, N nozzles, belts and adsorption devices;

[0040] Each of the bottom plates is arranged on one of the printing frames, each of the nozzles is arranged on one of the bottom plates, and the belt is arranged below N of the nozzles;

[0041] The adsorption device is arranged below the belt so that the corrugated cardboard moves along the belt;

[0042] The paper pressing device is arranged above the belt and is used for pressing the warped corrugated paperboard flat on the belt.

[0043] In some embodiments, a slope is provided on the bottom of the bottom plate near the paper feed end;

[0044] When the printing frame descends, the inclined surface can abut against the contact portion of the first body of the pressing plate of the paper pressing device, so that the first body is inclined to the surface of the corrugated cardboard, and the warped corrugated cardboard is flattened.

[0045] At least one beneficial effect of the paper pressing device and printing assembly provided by the embodiment of the present invention is that: an angle can be formed between the pressing plate and the back plate, and the first spring and the second spring both have an elastic force that drives the angle to be equal to 90 degrees; when the pressing plate is pressed by the printing frame, the printing frame drives the pressing plate to move down away from one side of the back plate and overcomes the elastic force, so that the pressing plate flattens the corrugated cardboard located below the printing frame, so that the warped corrugated cardboard is flattened, and the corrugated cardboard has a higher flatness, thereby effectively reducing the risk of collision between the nozzle and the corrugated cardboard; at the same time, the corrugated cardboard with a higher flatness can not only effectively avoid paper jams, thereby improving printing efficiency, but also improve printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as the same elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0047] Figure 1A schematic structural diagram of a paper pressing device provided in an embodiment of the present utility model;

[0048] Figure 2 The embodiment of the present invention provides Figure 1 A local enlarged view at point A;

[0049] Figure 3 A front view of a paper pressing device provided in an embodiment of the present utility model;

[0050] Figure 4 A schematic structural diagram of a printing assembly provided in an embodiment of the present utility model;

[0051] Figure 5 The embodiment of the present invention provides Figure 4 A partial enlarged view at point B;

[0052] Figure 6 The embodiment of the present invention provides Figure 3 A partial enlarged view at point C;

[0053] Figure 7 The embodiment of the present invention provides Figure 3 A local enlarged view at point D;

[0054] Figure 8 The embodiment of the present invention provides Figure 4 A partial enlarged view at point E.

[0055] Reference numerals:

[0056] 100, paper pressing device; 1001, first direction; 1002, second direction; 1003, third direction; 1004, fourth direction; 1005, angle; 1, pressing plate; 11, first body; 12, first supporting portion; 111, contact portion; 121, first substrate; 122, first vertical plate; 1221, first mounting hole; 2, back plate; 21, second body; 22, second supporting portion; 221, second substrate; 222, second vertical plate; 2221, second mounting hole; 3, hinge; 31, first page plate; 32, second page plate; 33, page axis; 4, first spring; 5, second spring;

[0057] 200, printing assembly; 2001, printing frame; 2002, frame; 2003, bottom plate; 2004, belt; 2005, first printing frame; 2006, second printing frame; 2007, paper guide rear plate; 2008, inclined plane;

[0058] 300. Corrugated cardboard. DETAILED DESCRIPTION

[0059] The present invention is described in detail below with reference to specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0060] It should be noted that, unless otherwise clearly specified and limited, the terms "relative", "first direction", "second direction", "third direction", "fourth direction", "close to", "protruding from", etc. used in this specification to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention. Terms such as "installation", "fitting", "connection" and "fixation" should be understood in a broad sense. 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; "fixation" can be bolt fixation, snap fixation or glue fixation; the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, the features limited to "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features; "multiple" or "several" means two or more; in addition, "and / or" includes any and all combinations of one or more related listed items; for ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0061] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0062] In this embodiment, the specific shape, structure and size of the "paper pressing device and printing component" are not limited, and those skilled in the art can selectively use any appropriate implementation method according to actual needs.

[0063] Figure 1 This is a schematic structural diagram of a paper pressing device provided in an embodiment of the present utility model. Figure 2 The embodiment of the present invention provides Figure 1 A partial enlarged view of point A. Figure 3 This is a front view of the paper pressing device provided in an embodiment of the present utility model. Figure 4 This is a schematic structural diagram of the printing assembly provided in an embodiment of the present utility model.

[0064] See also Figures 1-4The paper pressing device 100 is used in conjunction with a printing assembly 200 having a printing frame 2001 to flatten warped corrugated cardboard 300 to improve the flatness of the corrugated cardboard 300, thereby effectively preventing the printing assembly 200 from damaging a print head (not shown in the figure) due to the warping of the corrugated cardboard 300 during printing on the corrugated cardboard 300, and even causing paper jams, ink drift, and scratches.

[0065] Specifically, ink drift usually refers to the phenomenon that printing ink produces thin strips and breaks into fine droplets during the printing process, which then drift into the air like mist. Generally speaking, when the nozzle (not shown in the figure) is far away from the corrugated cardboard, the ink droplets are easily affected by external factors such as air flow during the spraying process, which causes the ink droplets to be unable to be sprayed in a straight line on the surface of the corrugated cardboard, thereby causing ink drift.

[0066] It should be noted that rubbing usually refers to the phenomenon that the printing is blurred or missing due to friction between the print head and the corrugated cardboard during or after printing.

[0067] In summary, both ink drift and ink rubbing can lead to blurred, unclear or incomplete printing, thereby reducing the printing quality of the corrugated cardboard 300 by the printing assembly 200.

[0068] The paper pressing device 100 includes a pressing plate 1 , a back plate 2 , a plurality of hinges 3 , a pair of first springs 4 and a plurality of second springs 5 .

[0069] The back plate 2 is fixedly mounted on at least a portion of the printing assembly 200 ; and the back plate 2 is parallel to the printing frame 2001 during the rising or falling process of the printing frame 2001 .

[0070] In addition, the pressing plate 1 is hinged to the back plate 2 via a plurality of hinges 3 so that the pressing plate 1 can rotate relative to the back plate 2; the side of the pressing plate 1 away from the back plate 2 corresponds to the installation position of the printing frame 2001.

[0071] Generally speaking, the hinge 3 includes at least: a first page plate 31, a second page plate 32 and a page axis 33; therefore, the first page plate 31 can be welded to the first body 11, and the second page plate 32 can be welded to the above-mentioned second body 21, so that the pressure plate 1 can rotate relative to the back plate 2 around the above-mentioned page axis 33.

[0072] In addition, either end of each first spring 4 is connected to the pressure plate 1 , and the other end of each first spring 4 is connected to a portion of the printing assembly 200 .

[0073] It can be understood that the two ends of each second spring 5 are respectively connected to the back plate 2 and the pressure plate 1, so that an angle 1005 is formed between the back plate 2 and the pressure plate 1; the first spring 4 and the second spring 5 both have an elastic force that drives the angle 1005 to be equal to 90 degrees.

[0074] In an embodiment of the present application, when the printing frame 2001 is in the moisturizing stage (the moisturizing stage can be understood as the initial position of the printing frame 2001, and the nozzle is not printing ink at this time), the first body 11 (or pressure plate 1) and the second body 21 (or back plate 2) of the paper pressing device 100 are in a vertical state. At this time, the first body 11 (or pressure plate 1) is far away from the belt 2004, so it will not affect the execution of other processes on the entire printing production line (for example, grooving process, line pressing process, varnish process, pre-coating process and traditional printing process); in summary, when the paper pressing device 100 is in the initial position of the printing frame 2001, the above-mentioned angle is equal to 90 degrees.

[0075] It can be understood that when the pressure plate 1 is pressed by the printing frame 2001, the printing frame 2001 drives the pressure plate 1 to descend away from the side of the back plate 2 and overcomes the elastic force so that the pressure plate 1 flattens the corrugated cardboard 300 located below the printing frame 2001, so that the warped corrugated cardboard 300 is flattened, and then the corrugated cardboard 300 has a higher flatness, thereby effectively reducing the risk of collision between the nozzle and the corrugated cardboard 300; at the same time, the corrugated cardboard 300 with a higher flatness can not only effectively avoid the occurrence of paper jams to improve printing efficiency, but also improve printing quality.

[0076] Further explanation, when the printing frame 2001 is in the initial position, the side of the pressure plate 1 away from the back plate 2 does not drop, and the second spring 5 is at the initial length at this time; and the second spring 5 can not only provide the above-mentioned elastic force, but also overcome the deadweight of the pressure plate 1; in summary, when the second spring 5 is at the initial length, it can force the first body 11 (or pressure plate 1) and the second body 21 (or back plate 2) to be perpendicular to each other.

[0077] Specifically, the first spring 4 can not only provide the elastic force mentioned above, but also prevent the first body 11 (or the pressing plate 1) from being deformed.

[0078] Figure 5 The embodiment of the present invention provides Figure 4 A partial enlarged view at point B. Figure 6 The embodiment of the present invention provides Figure 3 A partial enlarged view at point C. Figure 7 The embodiment of the present invention provides Figure 3 A partial enlarged view at point D.

[0079] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the pressing plate 1 includes: a first body 11 and a first supporting portion 12 extending along a first direction 1001 .

[0080] The first support portion 12 is disposed on the surface of the first body 11 ; and a pair of first springs 4 are symmetrically disposed on opposite sides of the first body 11 in the first direction 1001 .

[0081] In addition, one side of the first body 11 in the second direction 1002 is connected to a portion of the hinge 3; a contact portion 111 is provided on the other side of the first body 11 in the second direction 1002, and the contact portion 111 corresponds to the installation position of the printing frame 2001.

[0082] In addition, the first direction 1001 is the length direction of the first body 11 , and the second direction 1002 is the width direction of the first body 11 .

[0083] In some embodiments, as Figure 1 、 Figure 3 and Figure 6 As shown, the first supporting portion 12 includes a first base plate 121 and a first vertical plate 122 .

[0084] It can be understood that the first substrate 121 is attached to the surface of the first body 11 ; the first vertical plate 122 is vertically arranged at the edge of the first substrate 121 and protrudes from the surface of the first substrate 121 .

[0085] It should be noted that a plurality of first mounting holes 1221 arranged along the first direction 1001 are formed on the first vertical plate 122 , and each first mounting hole 1221 can be connected to any end of each second spring 5 .

[0086] In some embodiments, combined Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 7 It can be seen that the back plate 2 includes: a second main body 21 and a second support portion 22 extending along the third direction 1003 .

[0087] In the embodiment of the present application, the second support portion 22 is provided on the surface of the second body 21 .

[0088] Specifically, one side of the second body 21 in the fourth direction 1004 is fixedly mounted on at least a portion of the printing assembly 200 ; the other side of the second body 21 in the fourth direction 1004 is connected to another portion of the hinge 3 .

[0089] To further illustrate, the third direction 1003 is the length direction of the second body 21 , the fourth direction 1004 is the direction in which the printing frame 2001 descends or ascends, and the third direction 1003 and the fourth direction 1004 are orthogonal to each other.

[0090] In some embodiments, reference Figure 1 、 Figure 3 and Figure 7 It can be seen that the second supporting portion 22 includes a second base plate 221 and a second vertical plate 222 .

[0091] The second substrate 221 is attached to the surface of the second body 21 ; the second vertical plate 222 is vertically arranged at the edge of the second substrate 221 and protrudes from the surface of the second substrate 221 .

[0092] In addition, the second vertical plate 222 is provided with a plurality of second mounting holes 2221 arranged along the third direction 1003 , and each second mounting hole 2221 can be connected to the other end of each second spring 5 .

[0093] Specifically, the first support portion 12 can serve as a reinforcing rib of the first body 11, and the second support portion 22 can serve as a reinforcing rib of the second body 21 to increase the mechanical strength of the first body 11 and the second body 21, thereby reducing the deformation of the first body 11 and the second body 21 during the warping correction process.

[0094] In some embodiments, according to Figures 1-4 It can be seen that when the printing frame 2001 rises, the first spring 4 and the second spring 5 provide elastic force to drive the pressure plate 1 to rise away from the side of the back plate 2. At this time, the pressure plate 1 and the back plate 2 are perpendicular to each other, and the angle 1005 is equal to 90 degrees.

[0095] In some embodiments, please refer to Figures 1-4 When the side of the pressing plate 1 away from the back plate 2 abuts against the surface of the corrugated cardboard 300 under the pressure of the printing frame 2001, the first substrate 121 is inclined relative to the surface of the corrugated cardboard 300 so that a trumpet-shaped opening is formed between the first substrate 121 and the surface of the corrugated cardboard 300.

[0096] Figure 8 The embodiment of the present invention provides Figure 4 A partial enlarged view at point E.

[0097] See also Figures 1-8 The printing assembly 200 at least includes: N printing frames 2001, a frame 2002 and the above-mentioned paper pressing device 100.

[0098] It can be understood that the paper pressing device 100 is arranged in front of the first printing frame 2005, and a paper guide rear pressing plate 2007 is provided in front of the second printing frame 2006 to the Nth printing frame.

[0099] It should be noted that the corrugated cardboard 300 passes through the first printing frame 2005, the second printing frame 2006 to the Nth printing frame in sequence.

[0100] Specifically, N printing frames 2001 are fixedly installed on the frame 2002, and N is an integer greater than 1.

[0101] In some embodiments, please refer to Figures 1-8 The printing assembly 200 further includes: N bottom plates 2003, N nozzles (not shown in the figure), a belt 2004 and an adsorption device (not shown in the figure).

[0102] Each base plate 2003 is arranged on a printing frame 2001, each nozzle (not shown in the figure) is arranged on a base plate 2003, and the belt 2004 is arranged below the N nozzles.

[0103] In addition, a suction device is provided below the belt 2004 so that the corrugated cardboard 300 can be moved along the belt 2004 .

[0104] In addition, the paper pressing device 100 is disposed above the belt 2004 and is used to press the warped corrugated cardboard 300 flat on the belt 2004 .

[0105] In some embodiments, as Figures 1-8 As shown, a slope 2008 is provided at the bottom of the bottom plate 2003 close to the paper feeding end.

[0106] In the embodiment of the present application, when the printing frame 2001 descends, the inclined surface 2008 can abut against the contact portion 111 on the first body 11 of the pressing plate 1 of the paper pressing device 100, so that the first body 11 is inclined toward the surface of the corrugated cardboard 300, and the warped corrugated cardboard 300 is flattened.

[0107] Combine Figures 1-8As can be seen, when the printing assembly 200 needs to print on the corrugated cardboard 300, the printing frame 2001 automatically descends to the required height based on the thickness of the corrugated cardboard 300, thereby pressing the contact portion 111 of the first body 11 downward, so that the aforementioned angle exceeds 90 degrees. At this time, the first body 11 and the surface of the corrugated cardboard 300 form a trumpet-shaped opening with an extremely large chamfer. At the same time, warped or arched corrugated cardboard 300 can enter through the trumpet-shaped opening with an extremely large chamfer and be flattened on the belt 2004. It is then firmly adsorbed to the surface of the belt 2004 by the adsorption device, thereby ensuring a high degree of flatness of the corrugated cardboard 300 during the printing process, which not only effectively ensures print quality but also prevents collision between the nozzle and the corrugated cardboard. In addition, because the trumpet-shaped opening has a sufficiently large and smooth chamfer, it can effectively increase the tolerance and fault tolerance of the corrugated cardboard 300.

[0108] It should be noted that using the deformation of the first spring 4 and the second spring 5 as the driving force for the pressure plate 1 to rise can not only save costs but also make the action more consistent and lasting.

[0109] In the embodiment of the present application, the paper pressing device 100 is provided with rotation by the hinge 3, and the upward power is provided by the first spring 4 and the second spring 5. Therefore, the paper pressing device 100 will not experience material deformation during the warping correction process, which can better ensure the durability of the paper pressing device 100; moreover, the paper pressing device 100 has a simple structure, thereby effectively reducing the manufacturing cost of the paper pressing device 100.

[0110] It can be understood that the paper pressing device 100 cooperates with the adsorption device and can be applicable to corrugated cardboard 300 of certain thickness and with large warping; and the requirements of the paper pressing device 100 for the corrugated cardboard 300 can even be compatible with traditional requirements; in addition, while having a high tolerance for the corrugated cardboard 300, the paper pressing device 100 can ensure the flatness of the corrugated cardboard 300 during the printing process, thereby effectively improving the printing quality.

[0111] In summary, the paper pressing device and printing assembly provided by the embodiment of the present invention can form an angle between the pressure plate and the back plate, and the first spring and the second spring both have an elastic force that drives the angle to be equal to 90 degrees; when the pressure plate is pressed by the printing frame, the printing frame drives the pressure plate to descend away from the side of the back plate and overcomes the elastic force, so that the pressure plate flattens the corrugated cardboard located below the printing frame, so that the warped corrugated cardboard is flattened, and then the corrugated cardboard has a higher flatness, thereby effectively reducing the risk of collision between the nozzle and the corrugated cardboard; at the same time, the corrugated cardboard with a higher flatness can not only effectively avoid paper jams, thereby improving printing efficiency, but also improve printing quality. Therefore, the paper pressing device and printing assembly provided by the embodiment of the present invention have certain novelties compared to traditional paper pressing devices and printing assemblies.

[0112] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention cannot be limited to these descriptions. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the concept of the present invention, and all of these modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A paper pressing device, used in conjunction with a printing assembly having a printing frame; characterized in that: include: A pressure plate, a back plate, a plurality of hinges, a pair of first springs, and a plurality of second springs; the back plate is fixedly mounted on at least a portion of the printing assembly; The pressing plate is hinged to the back plate via a plurality of hinges, so that the pressing plate can rotate relative to the back plate; a side of the pressing plate away from the back plate corresponds to the installation position of the printing frame; Either end of each of the first springs is connected to the pressure plate, and the other end of each of the first springs is connected to a portion of the printing assembly; The two ends of each second spring are respectively connected to the back plate and the pressure plate, so that an angle is formed between the back plate and the pressure plate; the first spring and the second spring both have an elastic force that drives the angle to be equal to 90 degrees; When the pressing plate is pressed by the printing frame, the printing frame drives the pressing plate to descend away from one side of the back plate and overcomes the elastic force so that the pressing plate flattens the corrugated cardboard below the printing frame.

2. The paper pressing device according to claim 1, characterized in that: The pressing plate comprises: a first body and a first supporting portion extending along a first direction; The first support portion is provided on the surface of the first body; a pair of first springs are symmetrically provided on two opposite sides of the first body in the first direction; One side of the first body in the second direction is connected to a portion of the hinge; the other side of the first body in the second direction is provided with a contact portion, and the contact portion corresponds to the installation position of the printing frame; The first direction is the length direction of the first body, and the second direction is the width direction of the first body.

3. The paper pressing device according to claim 2, characterized in that: The first supporting member comprises: a first base plate and a first vertical plate; The first substrate is attached to the surface of the first body; the first vertical plate is vertically arranged at the edge of the first substrate and protrudes from the surface of the first substrate; The first vertical plate is provided with a plurality of first mounting holes arranged along the first direction, and each of the first mounting holes can be connected to any end of each of the second springs.

4. The paper pressing device according to claim 1, wherein: The backplane comprises: a second body and a second supporting portion extending along a third direction; the second supporting portion is provided on a surface of the second body; One side of the second body in the fourth direction is fixedly mounted on at least a portion of the printing assembly; the other side of the second body in the fourth direction is connected to another portion of the hinge; The third direction is the length direction of the second body, the fourth direction is the direction in which the printing frame descends or ascends, and the third direction and the fourth direction are orthogonal to each other.

5. The paper pressing device according to claim 4, characterized in that: The second supporting portion includes: a second base plate and a second vertical plate; The second substrate is attached to the surface of the second body; the second vertical plate is vertically arranged at the edge of the second substrate and protrudes from the surface of the second substrate; The second vertical plate is provided with a plurality of second mounting holes arranged along the third direction, and each of the second mounting holes can be connected to the other end of each of the second springs.

6. The paper pressing device according to claim 1, wherein: When the printing frame rises, the first spring and the second spring provide the elastic force to drive the pressure plate to rise away from one side of the back plate. At this time, the pressure plate and the back plate are perpendicular to each other, and the angle between them is equal to 90 degrees.

7. The paper pressing device according to claim 3, characterized in that: When the side of the pressing plate away from the back plate abuts against the surface of the corrugated cardboard under the pressure of the printing frame, the first substrate is inclined to the surface of the corrugated cardboard to form a trumpet-shaped opening with the surface of the corrugated cardboard.

8. A printing assembly, characterized in that: At least: N printing frames, a frame, and a paper pressing device according to any one of claims 1 to 7; The paper pressing device is arranged in front of the first printing frame, and a paper guide rear pressing plate is arranged in front of the second printing frame to the Nth printing frame; The corrugated cardboard passes through the first printing frame, the second printing frame and the Nth printing frame in sequence; Wherein, N printing frames are fixedly installed on the frame, and N is an integer greater than 1.

9. The printing assembly according to claim 8, characterized in that: Also includes: N base plates, N nozzles, belts and adsorption devices; Each of the bottom plates is arranged on one of the printing frames, each of the nozzles is arranged on one of the bottom plates, and the belt is arranged below N of the nozzles; The adsorption device is arranged below the belt so that the corrugated cardboard moves along the belt; The paper pressing device is arranged above the belt and is used for pressing the warped corrugated paperboard flat on the belt.

10. The printing assembly according to claim 9, characterized in that: The bottom of the bottom plate close to the paper feed end is provided with an inclined surface; When the printing frame descends, the inclined surface can abut against the contact portion of the first body of the pressing plate of the paper pressing device, so that the first body is inclined to the surface of the corrugated cardboard, and the warped corrugated cardboard is flattened.

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