CN209832879U - A printing plate used for printing plate cylinder and convenient for color registration and plate correction - Google Patents

Abstract

The utility model provides a printing plate that is used for forme cylinder and is convenient for chromatography plate checking, this printing plate includes the picture and text page of a whole page, the leading edge, the trailing edge is with controlling the side edge, the inboard blank department at left side or right side edge of printing plate is provided with the scale along the length direction of printing plate, this scale is provided with the position value of each printing plate that obtains according to the calculation of the girth ratio of last one color impression point to the line length of next one color impression point and forme cylinder, 0 scale correspondence is the start print point of first color forme, the scale interval that other position values were located is that first color forme start print point and follow-up each color forme start print the position difference between the point. The utility model discloses a printing forme, simple structure can shorten the time of proofreading of just chromatography, need not shut down when proofreading the version moreover, has reduced the risk of dry version, is particularly suitable for the forme cylinder of polychrome chromatography technology to use.

Description

A printing plate used for printing plate cylinder and convenient for color registration and plate correction

technical field

The utility model relates to printing equipment, in particular to a printing plate on a printing plate cylinder of the printing equipment, and more particularly relates to a printing plate used for the printing plate cylinder and convenient for color registration and plate correction.

Background technique

The rotary printing machine uses the impression cylinder and the plate cylinder to contact and imprint continuously. The plate cylinder includes a printing plate, a splint mechanism and a cylinder. The printing plate includes a front edge parallel to the axis of the cylinder. and trailing edge and side edges extending axially along the circumference of the plate cylinder. The printing plate is fixed on the cylinder in a detachable manner. When loading the plate, first determine the position of the starting point of the printing plate, and then fix its front edge and rear edge in the clamping mechanism to make the printing plate and the surface of the cylinder in a relatively static state.

At present, color printing is mainly realized through multi-color overprinting. Multi-color overprinting is to separate the color of the original to make a single-color printing plate with different screen line angles, which are overlapped in sequence according to the color sequence of the printing plate. , Prints with the same color tone. Overprinting requires that after the previous color is printed, when the next color is printed, the next color can be accurately superimposed on the previous color. As shown in Figure 1, since there is a certain distance between adjacent two-color embossing units, and after the paper passes through the embossing point of the previous color, it needs to pass through multiple guide rollers and regulating rollers to reach the embossing of the next color. point, if the line length from the embossing point of one color to the embossing point of the next color is an integral multiple of the circumference of the printing plate cylinder, then the starting point of each single-color printing plate should be at the same position, but this is not the case in actual production, usually The situation is that the circumference of the printing plate cylinder is fixed, and the line length from the stamping point of one color to the stamping point of the next color changes. Therefore, the starting point of each color printing plate has a certain position difference. Every time a new work order needs to reload the printing plate, it is necessary to proofread. The existing method is to use the auxiliary calibration frame to align the horizontal line of the arrow on the printing plate with the keyway of the link gear of the cylinder. During initial overprinting, first Ink printing, then stop the machine to measure the overprint error of each color, then stop the transfer plate, loosen the link gear, move the plate according to the error length, and then start the machine and use the overprint system to fine-tune the overprint error. This kind of operation needs to stop, which is cumbersome and wastes paper. In addition, there is a danger of dry plate due to stopping the transfer plate.

Contents of the invention

In order to solve the above existing problems, the purpose of this utility model is to provide a printing plate used for printing plate cylinder and convenient for color registration and calibration.

In order to achieve the above purpose, the printing plate of the utility model that is used for the printing plate cylinder and is convenient for color registration and plate correction includes a graphic layout, a front edge, a rear edge, and left and right side edges, and it is characterized in that: the left side of the printing plate A scale is set along the length direction of the printing plate on the inner blank space of the side or the right edge, and the scale is provided with various values calculated according to the ratio of the line length from the printing point of the previous color to the printing point of the next color and the circumference of the printing plate cylinder. The position value of the printing plate, the scale of 0 corresponds to the printing start point of the first color printing plate, and the scale value of other position values is the position between the starting printing point of the first color printing plate and the starting printing point of subsequent printing plates of each color difference.

In order to more clearly show the imprinting starting point of each single-color embossing unit, the position value corresponding to each color printing plate on the scale above is a bold line marked with the color printed by the printing plate.

The ruler on the above-mentioned printing plate is formed by engraving.

The printing plate of the utility model adopts a scale along the length direction of the printing plate in the blank space on the left or right edge of the printing plate, and the scale is provided with the line length from the embossing point of the previous color to the embossing point of the next color. The position values of the printing plates of each color obtained by calculating the ratio to the circumference of the printing plate, when the 0 scale is set as the starting point of the printing plate of the first color, the position difference between the printing plates of other colors and the printing plate of the first color is It is clear at a glance, since the position of the scraper is fixed, you only need to align the position value of the printing plate with the blade of the scraper when loading the plate, and then use the overprinting system to fine-tune the overprint error, so that the previous color and the next color can be accurately overprinted . The printing plate of the utility model has a simple structure, can shorten the proofreading time of the initial overprinting, and does not need to stop the machine during the proofreading, which reduces the risk of dry plates, and is especially suitable for the printing plate cylinder of the multi-color overprinting process.

Description of drawings

Fig. 1 is a schematic structural diagram of the connection of each single-color embossing unit in the multi-color overprinting process.

Fig. 2 is a schematic structural view of the printing plate of the present invention.

Fig. 3 is a schematic diagram of the structure of the printing plate cylinder formed after the printing plate of the utility model is loaded.

Detailed ways

As shown in Figure 2, the printing plate of the present utility model includes a graphic layout 1, a front edge 2, a rear edge 3, a left edge 3 and a right edge 4. A scale 5 is provided in the length direction, and the scale is provided with the position values of the printing plates of each color calculated according to the ratio of the line length from the embossing point of the previous color to the embossing point of the next color and the circumference of the printing plate. The scale is the position difference between the printing plate of the first color and the subsequent printing plates of each color, and the position value corresponding to each color printing plate on the scale is a bold thick line, which is displayed in the color printed by the printing plate .

Taking the four-color overprinting unit as an example, the order of overprinting is yellow, red, blue, and black. Set the starting point of the yellow printing plate at the 0 scale of the scale. The position difference between the red printing plate and the yellow printing plate is d ₁ , the position difference between the blue printing plate and the yellow printing plate is d ₂ , and the position difference between the black printing plate and the yellow printing plate is calculated from the ratio of the circumference of the printing plate cylinder is d ₃ , at this time, the line corresponding to d ₁ position on the scale of each color plate is thickened and displayed in red, the line corresponding to d ₂ position is thickened and displayed in blue, and the line corresponding to d ₃ position is thickened and displayed in black Display, when loading the plate, as shown in Figure 3, align the 0 scale on the yellow printing plate scale with the scraper blade on the cylinder 6 for plate loading, and so on, align the d ₁ scale on the red printing plate scale with the scraper blade For plate loading, align the d ₂ scale on the blue printing plate scale with the scraper blade for plate loading, align the d ₃ scale on the yellow printing plate scale with the scraper blade for plate loading, and then use the overprinting system to fine-tune the overprint error Adjust, you can make the four-color accurate overprint.

The above is only a specific description of an embodiment of the utility model printing plate, but this embodiment is not in order to limit the scope of protection of the utility model, and all equivalent implementations or changes that do not depart from the technical solution of the utility model, such as scale design on the scale All changes should be included in the scope of the present utility model.

Claims (3)

1. A printing plate that is used for printing plate cylinders and is convenient for color registration and proofreading, comprising a graphic layout, a front edge, a rear edge, and left and right side edges, characterized in that: the left or right edge of the printing plate A scale is set along the length direction of the printing plate in the inner blank space of the printing plate, and the scale is set with the position of each printing plate calculated according to the ratio of the line length from the printing point of the previous color to the printing point of the next color and the circumference of the printing plate cylinder The scale of 0 on the scale corresponds to the starting point of the printing plate of the first color, and the scale value of other position values is the position difference between the starting point of the printing plate of the first color and the starting point of the printing plate of subsequent colors . 2. The printing plate used for printing plate cylinder according to claim 1 and convenient for color registration and plate correction, characterized in that: the position value corresponding to each color printing plate on the scale is a thickened thick line, This thick line is marked with the color printed on the plate. 3. The printing plate used for the printing plate cylinder and convenient for color registering and proofreading according to claim 1 or 2, characterized in that: the scale on the printing plate is formed by an engraving process.