JPH06143534A - Gravure photoengraving output device - Google Patents

Abstract

PURPOSE:To provide a gravure photoengraving output device which can easily and accurately form an endless gravure without requiring skilled operation. CONSTITUTION:First, the number of unit image cells, i.e., the number of cells of a main scanning direction necessary to constitute an original image, is calculated from a set cell pitch (step S3) to be decided from screen ruling (step S4). Then, the number entire peripheral cells, i.e., the number of cells corresponding to an entire periphery of a gravure material, is calculated from the number of unit image cells and the number of original images to be engraved on the gravure material in a main scanning direction (circumferential direction) (step S5). A main scanning direction correcting cell pitch for actually engraving is calculated from the number of the entire peripheral cells and a peripheral length of the gravure material (step S6), and the cells are engraved on the gravure material according to the calculated main scanning direction correcting cell pitch (steps S7, S8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravure plate-making output device for producing a plate material for gravure printing.

[0002]

2. Description of the Related Art In gravure printing, a cylindrical plate material (cylinder) is used, and a long printing material (paper or the like) wound in a roll shape is used. Is often printed. At this time, a long printed material without a joint can be obtained by creating a document whose start point and end point are the same and making the plate endless on the cylinder. As a result, the labor required for cutting the printing material is greatly reduced, and the yield of the printing material is also improved.

In a conventional gravure plate-making output device, as shown in FIG. 7, an original 72 attached to an input cylinder 71.
A method of directly engraving the engraving cylinder (plate material) 73 based on the image data obtained by reading In this case, in order to create an endless plate in the engraving cylinder 73, the engraving cylinder 7
It is necessary that the time for 3 to make one turn has a constant relationship with the time for the reading head 74 to pass the portion between the reading start point 75 and the reading end point 76 of the original 72 during reading. I have to. Therefore, the input cylinder 71
Marks are placed at the reading start point 75 and the reading end point 76 of the document, and the strobe 77 is turned on at a predetermined timing when the document is read. Then, the rotation speed of the input cylinder 71 is adjusted so that both marks appear to stop at the strobe irradiation point 78.

[0004]

In order to make an endless plate, it is necessary to perform the above-mentioned rotation adjustment with high accuracy. For that purpose, marking at the reading start point 75 and the reading end point 76 of the original 72 is performed. Accurately, and
It is necessary to strictly judge the coincidence between the marks of both points 75 and 76 and the strobe irradiation point 78. However, these are very delicate tasks and require skill.

The present invention has been made to solve the above problems, and an object of the present invention is to easily produce an accurate endless plate without requiring such skilled work. It is to provide a gravure plate-making output device capable of performing.

[0006]

The present invention, which has been made to solve the above problems, engraves cells in the main scanning direction, which is the circumferential direction of a cylindrical plate material, without gaps, as shown in FIG. A gravure plate making output device that creates a gravure printing plate for endless pattern printing by performing a) a) main scanning direction necessary to form an engraved image from the set cell pitch determined from the screen ruling and the size of the original image. Unit image cell number calculating means 11 for calculating the unit image cell number which is the number of cells of b), and b) the whole circumference of the plate material from the number of unit image cells and the number of impositions in the circumferential direction of the engraved image engraved on the plate material The total cell number calculating means 12 for calculating the total cell number which is the cell number corresponding to, and c) the main scanning direction corrected cell pitch for actual engraving is calculated from the total cell number and the perimeter of the plate material. Main scanning direction correction And calculating means 13, d) the calculated main scanning direction modified cell pitch, is characterized in that it comprises a carving means 14 for performing engraving of cells on the plate material.

[0007]

The cell pitch in the gravure printing plate is basically determined by the screen ruling specified in advance. This is called a set cell pitch. Unit image cell number calculation means 1
1 calculates the number of cells in the main scanning direction (the number of unit image cells) required to form the engraved image from the set cell pitch and the size of the original image to be printed in the main scanning direction. The total circumference cell number calculation unit 12 determines the number of cells (entire circumference cell number) corresponding to the entire circumference of the plate material from this unit image cell number and the number of surface attachments in the circumferential direction of the engraved image engraved on the plate material. calculate. For example, when the imposition number is 1, the unit image cell number is the same as the entire cell number, and when the imposition number is 2, the value obtained by doubling the unit image cell number is the entire cell number. The main scanning direction cell pitch calculating means 13 calculates the cell pitch in the main scanning direction by dividing the perimeter of the plate material by the total number of cells. Then, the engraving means 14 engraves cells on the plate material with the calculated cell pitch in the main scanning direction. As a result, the cells are engraved on the entire circumference of the plate material without any gaps and without overlapping, thereby producing an accurate endless printing plate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A gravure plate-making output device which is an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, the gravure plate-making output device of this embodiment comprises a gravure engraving machine 21 and an output processing device 22. In this embodiment, as the output processing device 22, as shown in FIG.
5, a workstation mainly composed of the ROM 226 and the RAM 227 is used. Output processing device 22
In addition, a data input / output device 221 (for example, a magneto-optical disk drive or the like) for inputting image data or the like from a medium in which image data is recorded or outputting the image data or the like to the medium, a display 222, a keyboard 223, a system disk device 224 such as a hard disk, and an image RAM 228 provided especially for storing image data. Each of these elements is connected by a bus 229.

As shown in FIG. 2, the gravure engraving machine 21 has a mechanism section centering on a main scanning motor 29 for rotating a cylinder 27 which is a plate material and an engraving head 26 for engraving cells on the cylinder 27. In addition to the above, an engraving machine driver 24, an engraving head driver 25 for controlling these,
Also, an engraving machine controller 23 is provided. The engraving machine controller 23, as shown in FIG.
3, ROM 234, RAM 235, display 231
And a keyboard 232, and the engraving machine driver 2
4 and the engraving head driver 25 are connected by a bus 236. The bus 229 of the output processing device 22 and the bus 236 of the engraving machine controller 23 are connected via an interface (not shown).

The cylinder 27 is sandwiched between the drive rotary shaft of the main scanning motor 29 and the free rotary shaft of the cylinder fixing device 33, and is held at a predetermined position. The engraving head 26 is movably provided on a ball screw 30 provided in parallel with the rotation axis of the cylinder 27, and the engraving head 2 is rotated by rotating the ball screw 30 by a sub-scanning motor 28.
6 moves parallel to the rotation axis of the cylinder 27 (that is, in the sub-scanning direction). The main scanning motor 29 and the sub-scanning motor 28 are provided with rotary encoders 32 and 31, respectively, for the rotation angle of the cylinder 27 and the engraving head 2.
The positions of 6 can be detected by these.

The engraving head 26 has a stylus (needle) 36 for engraving cells on the cylinder 27, a vibrating portion 37 for vibrating the stylus 36, and a distance between the vibrating portion 37 and the surface of the cylinder 27. A moving unit 38 is provided for causing the movement. When engraving a cell in the cylinder 27, the stylus 36 is constantly vibrated at a high speed by the vibrating section 37 using a resonance mechanism, and the vibrating section 37 is moved by the moving section 38.
A cell having an arbitrary depth is engraved on the surface of the cylinder 27 by moving the cell closer to or away from the cylinder 27. Then, the cylinder 27 is rotated in the main scanning direction by the main scanning motor 29, and the engraving head 26 is moved in the sub scanning direction by the sub scanning motor 28, so that a two-dimensional image is formed on the surface (plate surface) of the cylinder 27 which is the plate material. Engrave each cell that composes.

Next, the operation of the gravure plate-making output device of this embodiment when forming the cylinder 27 for printing the endless pattern will be described. In this case, the main scanning direction (cylinder 2
(7 circumferential direction) cell pitch Lps is cylinder 27 circumferential length L
If it is not exactly 1 / t, as shown in FIG. 6 (a), the cell at the start end side and the cell at the end side in the main scanning direction are too far apart or too close to each other, and at the time of printing. Seams are noticeable. Therefore, in the gravure plate-making output apparatus of the present embodiment, the engraving machine controller 23 performs the processing as shown in FIG. 5, and the cell pitch is set to be an integer fraction of the circumferential length Lt of the cylinder 27 as shown in FIG. 6B. The cell pitch Lps is corrected to Lpp so that an accurate endless pattern printing gravure plate is created.

First, the number of surfaces attached to the cylinder 27 (of which the number in the main scanning direction is Ng), the cylinder circumferential length Lt, and the screen ruling Nl are input (step S).
1). This is the keyboard 2 of the engraving machine controller 23.
The data may be directly input from 32 or may be input in the form of transferring data from the output processing device 22. Next, the output processor 2 outputs the data of the original image to be engraved.
2, and stores it in the image RAM 235 (step S2). At this time, the size of the original image (in the main scanning direction and the sub scanning direction) is also read. Then, the set cell pitch Lps in the main scanning direction and the set cell pitch Lss in the sub scanning direction are calculated from the screen line number Nl and the cell shape (step S3). If the cell shape is the default,
The set cell pitches Lps and Lss can be calculated only from the screen ruling Nl.

Next, based on the original image data, from the size Lpg of the engraved image to be engraved on the cylinder surface in the main scanning direction and the set cell pitch Lps calculated in step S4, Npcl = INT (Lpg / Lps) ( By 1), the number of cells per one surface of the engraved image (unit image cell number) Npcl is calculated (step S4). Where INT
(X) is a function that takes the maximum integer that does not exceed x. The number of cells Npcl may be calculated by Npcl = INT (Lpg / Ls) +1 (2). And the number of cells per surface N
By multiplying pcl by the number Ng of surface attachments in the main scanning direction, Npct = Npc1 × Ng (3)
pct is calculated (step S5). As shown in FIG. 6A, Ng = 1 when the entire circumference of the cylinder 27 is covered with only one engraved image 61, and as shown in FIG.
When the entire circumference of the cylinder 27 is divided into two engraved images 62, Ng = 2.

Next, the cylinder 1 calculated in step S5
By dividing the cylinder circumference Lt by the number of cells Npct for the circumference, the corrected cell pitch (hereinafter referred to as the corrected cell pitch) Lpp in the main scanning direction is calculated as Lpp = Lt / Npct (4) (step S6). ).
The cylinder circumferential length Lt here (the value input in step S1) is a measured value. Next, from the main scanning direction correction cell pitch Lpp (mm), the cylinder circumferential length Lt (mm), and the vibration frequency per second of the stylus 36 by the vibrating section 37, that is, the vibration speed V (1 / sec), the cylinder 2
7, the number of rotations per second, that is, the rotation speed R (1 / se
c) is calculated as R = V · Lpp / Lt (5) (step S7).

After the rotation speed R of the cylinder 27 is calculated in this way, the engraving machine controller 23 sends this value R to the engraving machine driver 24, and controls the main scanning motor 29 so that the rotation speed of the cylinder 27 becomes that value. . The set cell pitch Lss in the sub-scanning direction calculated in step S3 is also sent to the engraving machine driver 24, and the sub-scanning motor 28 is controlled so that the (intermittent) feed amount of the engraving head becomes Lss.
The image data is converted by the engraving machine controller 23 into engraving data representing the cell depth and sent to the engraving head driver 25. The engraving head driver 25 engraves a cell having a depth (volume) corresponding to the image data on the cylinder 27 by controlling the moving unit 38 according to the engraving data (step S8). As a result, FIG.
As shown in FIG. 5, an endless plate in which the start end and the end in the main scanning direction are exactly continuous at the same pitch as the other part is created.

In the embodiment described above, step S
The engraving machine controller 23 that executes the processing of No. 4 is the unit image cell number calculating means of the present invention, and the engraving machine controller 23 that executes the processing of step S5 is the all-round cell number calculating means.
Engraving machine controller 23 that executes the processing of step S6
Corresponds to the main scanning direction corrected cell pitch calculating means, and the engraving machine driver 24, the engraving head driver 25, the engraving head 26, the main scanning motor 29, the sub-scanning motor 28, etc. correspond to the engraving means.

[0018]

According to the gravure plate-making output device of the present invention, anyone can easily make an accurate endless gravure plate without requiring any skilled work.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of the present invention.

FIG. 2 is a block diagram showing the configuration of a gravure plate-making output device that is an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an output processing device of the gravure plate-making output device according to the embodiment.

FIG. 4 is a block diagram showing a configuration of an engraving machine controller of the gravure plate-making output device according to the embodiment.

FIG. 5 is a flowchart of processing performed by the engraving machine controller in the embodiment.

FIG. 6 shows a case where engraving is performed with a set cell pitch as it is, a case where engraving is performed on one side by the gravure plate making output device of this embodiment (b), and a gravure plate making output of this embodiment. The development view of the cylinder which shows the state of a cell and a printing plate in the case of engraving two surfaces by the apparatus (c).

FIG. 7 is an explanatory view showing a state of conventional gravure plate making.

[Explanation of symbols]

11 ... Unit image cell number calculation means 12 ... Full circumference cell number calculation means 13 ... Main scanning direction corrected cell pitch calculation means 14 ... Engraving means 21 ... Gravure engraving machine 22 ... Output processing device 23 ... Engraving machine controller 24 ... Engraving machine driver 25 Engraving head driver 26 Engraving head 27 Cylinder (plate material) 28 Sub scanning motor 29 Main scanning motor

Claims (1)

[Claims] 1. A gravure plate-making output device for producing a gravure plate for endless pattern printing by engraving cells in the main scanning direction, which is the circumferential direction of a cylindrical plate material, with no gaps; A unit image cell number calculating means for calculating the unit image cell number, which is the number of cells in the main scanning direction required to form the engraved image, from the set cell pitch determined from the number and the size of the original image; and b) unit image cell number And the total circumference cell number calculating means for calculating the total circumference cell number, which is the number of cells corresponding to the entire circumference of the plate material, from the number of surface attachments in the circumferential direction of the engraved image engraved on the plate material, and c) the total circumference cell The main scanning direction corrected cell pitch calculating means for calculating the main scanning direction corrected cell pitch for actual engraving from the number and the perimeter of the plate material, and d) engraving cells on the plate material by the calculated main scanning direction corrected cell pitch. Sculpture A gravure plate-making output device comprising: