Double-sided drum printing machine

Abstract

The utility model provides a double-sided web press, and belongs to the field of printing equipment. The printing quality is improved, and the maintenance difficulty is reduced. A double-sided drum printing machine comprises an unwinding shaft and a winding shaft which are used for placing roll paper, a printing main body is connected between the unwinding shaft and the winding shaft, the printing main body comprises a plurality of printing roller sets, and the double-sided drum printing machine is characterized in that a U-shaped drying channel is connected between every two adjacent printing roller sets, and a printing module is formed through the U-shaped drying channels; the printing body is composed of a plurality of connected printing modules, the printing modules are used for printing corresponding color blocks on the front face and the back face of roll paper, and the roll paper sequentially passes through the printing modules to form a finished product. The modularized printing module is adopted, the U-shaped drying channel is matched with the printing roller set to form the maintenance space for an operator to go in and out, maintenance is facilitated, meanwhile, distortion caused by multi-color printing is avoided in a multi-time printing and drying mode, and the printing quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to printing equipment field, especially relate to a double -sided printing machine of reel. BACKGROUND

[0002] The double -sided printing machine is as a kind of product for realizing the birth of quick printing prompt overall printing sales, because printing cost is low and the degree of automation is high, is widely used in batch printing of same pattern and color, and the reel printing machine is divided into publishing letterpress printing machine, packaging intaglio printing machine, decorative intaglio printing machine and special intaglio printing machine by application field, and packaging intaglio printing machine is as an example, it is mainly composed of unwinding reel, printing main body and winding reel, blank reel is entered printing main body by unwinding reel, after printing and drying in the printing unit in printing main body, finished product is collected by winding reel, waiting for next step processing, wherein, to ensure that reel can accurately enter printing main body, and move along the intended trajectory in printing main body, therefore, guide wheel for guiding is arranged at the front and rear ends of printing main body and the required position in printing main body.But due to the reason of guide wheel, after printing on the front and drying, the pattern printed on the front will appear uneven color and mixed with other colors, leading to the problem of not displaying correct pattern.

[0003] Therefore, the prior art provides a double -sided printing machine, and the printed substrate is conveyed to the printing device of one side for one -sided printing by the conveying mechanism, then the first side of the printed substrate is dried by the first drying equipment, and then the substrate is conveyed to the printing device of the other side for the other side printing by the conveying mechanism, and the other side of the printed substrate is dried by the second drying equipment, after drying, it is collected by winding shaft, to complete next step process, wherein, since it adopts the design of double -layer drying equipment, although the floor area is reduced, but when fault occurs in later period, the drying channel of upper and lower superposition increases the difficulty of maintenance, and the single -sided printing mode is adopted, and a certain degree of color mixing occurs in the printing process, thereby affecting the overall printing quality, and the drying equipment is long, and the processing difficulty is greater. SUMMARY

[0004] The utility model aims at the above -mentioned problems existing in prior art, and provides a double -sided printing machine, and the technical problems to be solved by the utility model are how to improve printing quality and reduce maintenance difficulty.

[0005] The utility model discloses a double -sided printing machine of reel, including the unwinding shaft and the winding shaft for placing the paper roll, the unwinding shaft and the winding shaft are connected with the printing main part, the printing main part includes several printing roller groups, its characterized in that, the U -shaped drying channel is connected with between two adjacent printing roller groups, and forms printing module through U -shaped drying channel, the printing main part is composed of several connected printing module, the printing module is used for printing corresponding color block on the front and back of paper roll, the paper roll passes through several printing module and forms finished product.

[0006] On the basis of the prior art, the U-shaped drying channel is adopted to shorten the length of the drying channel, ensure that the ink printed on the front surface can be dried in time on the paper roll, connect two adjacent printing roller groups used for printing the front surface and the back surface through the U-shaped drying channel, and reserve a certain maintenance space for the operator.

[0007] In addition, the two adjacent printing roller groups used for printing the front surface and the back surface are matched with the U-shaped drying channel to form a printing module, the modular design is adopted, and the printing module can be adjusted according to different printing requirements.

[0008] In the double-sided printing machine of reel, the printing module includes a front printing group and a back printing group, the front printing group and the back printing group are connected through the U-shaped drying channel, and the paper roll passes through the front printing group, the U-shaped drying channel and the back printing group in sequence to complete double-sided printing.

[0009] In the double-sided printing machine of reel, the printing roller group includes a homogeneous roller, a plate roller and a back pressure roller.

[0010] In the double-sided printing machine of reel, the homogeneous roller, the plate roller and the back pressure roller in the printing roller group are arranged in sequence from left to right or from right to left.

[0011] In the double-sided printing machine of reel, the U-shaped drying channel includes three drying boxes and a guide wheel.

[0012] In the double-sided web printing machine, the positive printing group in two adjacent printing modules is connected through the back printing group.

[0013] In the double-sided web printing machine, the homogenizing roller is a screen roller, which is used for inking the plate roller. The inking of the plate roller is completed through the screen roller, thereby avoiding uneven color distribution in the inking process.

[0014] Compared with the prior art, the double-sided web printing machine has the following advantages:

[0015] 1. The printing body is composed of a plurality of printing modules, which can dry and fix the patterns printed on the web one by one, thereby reducing the printing difficulty, improving the printing quality, avoiding color mixing during printing, and replacing the corresponding modules of the double-sided cylinder printing equipment according to the printing needs.

[0016] 2. On this basis, the U-shaped drying channel is connected between two adjacent printing roller groups, which can shorten the length of the drying equipment while ensuring the drying time and quality, and cooperate with the two adjacent printing roller groups to facilitate the operator to enter the maintenance channel composed of the U-shaped drying channel to maintain the printing module.

[0017] 3. The homogenizing roller, plate roller and back pressure roller in the printing module are uniformly arranged from left to right, which facilitates the operator to replace the homogenizing roller according to the printing needs of different patterns and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the overall perspective view of the double-sided web printing machine;

[0019] Figure 2 is a schematic view of the printing module of the double-sided web printing machine;

[0020] Figure 3 is a printing process flow chart of the double-sided web printing machine;

[0021] In the figure, 1 is a winding shaft; 2 is a winding shaft; 3 is a printing module; 3a is a positive printing group; 3b is a back printing group; 4 is a U-shaped drying channel; 4a is a drying oven; 4b is a guide wheel; 5 is a printing roller group; 5a is a homogenizing roller; 5b is a plate roller; 5c is a back pressure roller; 6 is a housing; 7 is a bracket; 8 is a web; 9 is a maintenance space. DETAILED DESCRIPTION

[0022] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments, wherein the number of the cup groups of the technical scheme is at least two or more, wherein the embodiment mainly adopts a form of three cup groups combined.

[0023] Embodiment one

[0024] As shown in Figure 1 and Figure 2 A double-sided printing machine, which comprises a unwinding shaft 1, a winding shaft 2 and a printing body, the unwinding shaft 1 and the winding shaft 2 are connected through the printing body, wherein the printing body is composed of a plurality of printing modules 3, the printing module 3 comprises a U-shaped drying channel 4 and two printing roller groups 5, the two printing roller groups 5 are located at the opening end of the U-shaped drying channel 4 and form a maintenance channel for operators to enter and exit to replace the faulty parts, the printing roller group 5 comprises a uniformizing roller 5a, a plate roller 5b and a back pressure roller 5c, wherein a space for the paper roll 8 to pass through is left between the plate roller 5b and the back pressure roller 5c, the uniformizing roller 5a is a screen roller and can uniformly ink the plate roller 5b, the uniformizing roller 5a, the plate roller 5b and the back pressure roller 5c in the printing module 3 are arranged in a left-to-right arrangement, which simplifies the printing roller group 5 and facilitates the replacement and maintenance of the printing roller group 5, wherein the printing roller group 5 is arranged in an S shape in the transverse direction.

[0025] It is worth mentioning that the two ends of the printing body connected with the unwinding shaft 1 and the winding shaft 2 and the bending part of the U-shaped drying channel 4 are all provided with guide wheels 4b for adjusting the direction of the paper roll 8 and driving the paper roll 8 to move along the predetermined path, and the paper roll 8 enters the front printing group 3a and the back printing group 3b in turn to complete the printing of the corresponding color, and the U-shaped drying channel 4 cooperates with the printing roller group 5 located at the opening end to form a printing channel.

[0026] In addition, a shell 6 is arranged on both sides of the printing body, the shell 6 is used for fixing and connecting a plurality of printing modules 3, and the unwinding shaft 1 and the winding shaft 2 are both fixed on the mounting platform.

[0027] As shown in Figure 3 , the use method of the double-sided printing machine is as follows:

[0028] 1), install the paper roll 8 on the unwinding shaft 1, and stretch the end of the paper roll 8 on the outermost circle of the paper roll 8 to the guide wheel 4b at the end of the printing body;

[0029] 2), the guide wheel 4b drags the printing roller group 5 in the front printing group 3a, and the plate roller 5b and the back pressure tube are extruded to print the same pattern as the single color and shape on the plate roller 5b on the front surface of the paper roll 8;

[0030] 3) After printing the corresponding pattern on the front of the roll paper 8, the roll paper 8 is driven by the guide wheel 4b in the U-shaped drying tunnel 4 into the drying oven 4a of the U-shaped drying tunnel 4 for drying;

[0031] 4) After drying is completed, the roll paper 8 enters the printing roller group 5 in the back printing group 3b, and the same pattern as the single color and shape on the plate roller 5b is printed on the back of the roll paper 8 by extrusion of the plate roller 5b and the back pressure pipe;

[0032] 5) After printing the corresponding pattern on the back of the roll paper 8, the roll paper 8 is driven by the guide wheel 4b in the U-shaped drying tunnel 4 into the drying oven 4a of the U-shaped drying tunnel 4 for drying;

[0033] 6) After the back printing is completed, the roll paper 8 enters the front printing group 3a and the back printing group 3b in turn again and repeats steps 2 to 5 until the required pattern is printed on the roll paper 8, and the printing is completed;

[0034] 7) After the printing is completed, the roll paper 8 is conveyed into the winding shaft 2 by the guide wheel 4b at the end of the printing body, and the next process is prepared.

[0035] The present application is based on the existing double-sided roll printing equipment, and a printing body composed of a plurality of printing modules 3 is arranged between the unwinding shaft 1 and the winding shaft 2 fixed to the ground by the support 7. The front printing group 3a and the back printing group 3b in the printing module 3 complete the printing of the double-sided single-color pattern, and after the printing of the front is completed, the U-shaped drying tunnel 4 is used for drying to avoid the contact between the back pressure roller 5c and the front with the pattern printed to cause the pattern on the front to be damaged, and to reduce the possibility of color deviation caused by the mixing of new color and old color when the color is changed. In addition, the single-color single-time printing and drying before printing other patterns are adopted to avoid the color deviation caused by the mixing of different pattern edge colors in the multi-color printing process, and to improve the printing accuracy and printing efficiency.

[0036] It is worth mentioning that the printing module 3 of the present application is formed by two adjacent printing roller groups 5 and the U-shaped drying tunnel 4 bridging the two printing roller groups 5, and the maintenance space 9 for the operator to enter is formed by the U-shaped drying tunnel 4 and the two printing roller groups 5 located at the opening ends of the U-shaped drying tunnel 4, which is convenient for the operator to overhaul and replace the devices in the printing module 3, and the homogeneous roller 5a, the plate roller 5b and the back pressure roller 5c are arranged in the printing module 3 from left to right in sequence, which simplifies the installation mode of the printing roller group 5, without considering the current printing state in the assembly process, that is, whether the front or back surface needs to be printed in the current stage, and the arrangement mode of the three-section drying tunnel 4 is adopted, which reduces the length of the drying equipment, the printing module 3 reduces the floor area, and a plurality of printing modules 3 form the printing main body, and the user can increase or reduce the number of printing modules 3 according to the page printing requirements, and after increasing or reducing the printing module 3, it will not affect the normal use of the printing module 3, and ensures the printing quality.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0038] Although the terms such as 1, unwinding shaft; 2, winding shaft; 3, printing module; 3a, front printing group; 3b, back printing group; 4, U-shaped drying tunnel; 4a, drying tunnel; 4b, guide wheel; 5, printing roller group; 5a, homogeneous roller; 5b, plate roller; 5c, back pressure roller; 6, shell; 7, support; 8, paper roll; 9, maintenance space are used more in this paper, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A double-sided web printing machine comprising a web unwinding shaft (1) and a web winding shaft (2) for placing a web, between which there is connected a printing body comprising several printing roller groups (5), characterized in that, The U-shaped drying tunnel (4) is connected between two adjacent printing roller groups (5), and a printing module (3) is formed through the U-shaped drying tunnel (4), the printing main body is composed of a plurality of connected printing modules (3), the printing module (3) is used for printing corresponding color blocks on the front and back surfaces of the roll paper, and the roll paper sequentially passes through the plurality of printing modules (3) to form a finished product.

2. The perfecting web press according to claim 1, characterized in that The printing module (3) comprises a front printing group (3a) and a back printing group (3b), the front printing group (3a) and the back printing group (3b) are connected through the U-shaped drying tunnel (4), and the roll paper sequentially passes through the front printing group (3a), the U-shaped drying tunnel (4) and the back printing group (3b) to complete double-sided printing.

3. The perfecting web press according to claim 2, wherein, The printing roller group (5) comprises a homogenizing roller (5a), a plate roller (5b) and a back pressure roller (5c), the plate roller (5b) and the back pressure roller (5c) can push the roll paper upwards when printing the roll paper.

4. The perfecting web press according to claim 3, wherein, The homogenizing roller (5a), the plate roller (5b) and the back pressure roller (5c) in the printing roller group (5) are sequentially arranged from left to right or from right to left.

5. The perfecting web press according to any one of claims 2-4, characterized in that, The U-shaped drying tunnel (4) comprises three drying boxes (4a) and a guide wheel (4b), the guide wheel (4b) is used for driving the roll paper to move and adjusting the moving direction of the roll paper.

6. The perfecting web press according to claim 5, wherein, The front printing groups (3a) in two adjacent printing modules (3) are connected through the back printing groups (3b).

7. The perfecting web press according to claim 3 wherein, The homogenizing roller (5a) is a screen roller, and the screen roller is used for inking the plate roller (5b).

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