JP2002283529A - Method for judging printing deviation of printed matter printed by using sheet-fed printer, and digital image data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for judging a printing deviation of a printed matter printed by using a sheet-fed printer capable of obtaining an accurate printed matter and having a high printing operation efficiency, and digital image data. SOLUTION: The method for judging the printing deviation of the printed matter printed by using the sheet-fed printer comprises the steps of outputting data to a printing plate or a film by using a platemaking electronic image processing system, outputting at least one or more digital stylus marks to either one or one side of both right and left or top and bottom direction of the printing plate or the film, judging the printing state of the stylus mark, and deciding the deviation of the printed matter. The digital image data is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for judging print misregistration of a printed matter using a sheet-fed printing press capable of obtaining a highly accurate printed matter and having high printing work efficiency, and to digital image data.

[0002]

2. Description of the Related Art A sheet-fed lithographic offset printing press, which is currently the mainstream among sheet-fed printing machines, usually performs four-color printing during color printing. After attaching the printing plate to the printing press,
The paper is printed four times with these four printing plates. For this reason, it is necessary to perform an operation of aligning the positions of the images to be printed of the respective colors on a sheet (hereinafter, referred to as registration). As a result, the images on the paper that are printed after passing through the printing machine are properly overlapped with each other in four colors, so that beautiful color printing is completed.

In the case of double-sided printing, the printed paper is turned upside down and printing is performed again.

[0004] Unprinted portions of the printed sheets are cut together in a stacked state. For example, since eight sheets of A4 size paper can be cut out from a sheet of paper called Kikuzen, printing of eight sheets is performed simultaneously and cut. Generally, printed paper is cut.

[0005] Since the paper passes through the printing press in a certain manner, the image on the paper is printed properly when registration is being performed. However, if the position of the paper is shifted to the left, right, front, or back for some reason with respect to the printing plate attached to the printing press, the printed image on the paper is printed correctly, but the position of the printed image is It slips.

As described above, if the position of the print image is shifted on the paper, there arises a problem that it is not possible to collectively perform the second printing for double-sided printing or the cutting.

[0007] For this reason, conventionally, a handwriting needle mark is provided on a completed printing plate to cope with the problem. The handwriting needle mark is a scratch made on the printing plate by a handwriting needle, and the scratch is printed on a sheet to be a mark. The handwriting needle is marked at the end of the paper that will later be cut and discarded, and just over the edge of the paper to be printed.

[0008] When printing is performed after performing this operation, a line of a handwritten needle mark is printed at an end of a printed material printed at a normal position. However, if the position of the paper is shifted from side to side or back and forth for some reason with respect to the printing plate attached to the printing press, the handwritten needle marks will not be printed, or the positions of the handwritten needle marks will be printed differently. Or Conventionally, by visually judging this handwritten needle mark,
A printing product having a printing misalignment with respect to a printing plate attached to the printing press is determined, and non-defective and non-defective printing products are selected.

[0009] However, it is necessary to attach the handwritten needle mark in a good position on a printing plate in a good form. At present, this work requires a great deal of labor such as stopping the printing press, superimposing printed paper on a printing plate mounted on the printing press, making a registration, and then manually attaching the printing paper.

[0010] Conventionally, the handwriting needle mark is provided only at one location on the side of the horizontal needle device of the printing press. There was a problem in the accuracy of checking the printing deviation in the direction.

In addition, this work is inefficient in terms of working time because the printing press is once stopped after the registration, and the handwriting needle mark is put in, and the printing operator performs the work manually.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a print misregistration determination method and digital image data of a printed matter using a sheet-fed printing machine capable of obtaining a highly accurate printed matter and having high printing work efficiency. That is.

[0013]

Means for Solving the Problems As a result of intensive studies in view of the above, the inventor of the present invention has invented a method of determining a print misregistration of a printed material using a sheet-fed printing press and digital image data.

That is, according to the method of the present invention for determining the printing misregistration of a printed material using a sheet-fed printing press, data is output to a printing plate or film using an electronic image processing system for plate making, and the printing plate or film is printed. Output at least one digital needle mark on one side of one or both sides of the digital needle mark, determine a printing state of the digital needle mark, and determine a print shift of a printed matter. Is what you do.

Further, the digital image data of the present invention is:
In the above invention, the digital needle mark includes one long side and a plurality of parallel short sides branched in a branch at a fixed interval from the long side in opposite directions with respect to the midpoint of the long side. It is characterized by being provided on the long side.

In the digital image data of the present invention, it is preferable that the long side of the digital needle mark has a zigzag structure in which opposite long sides are combined with both ends of the long side.

[0017]

Embodiments of the present invention will be described with reference to the drawings.

A method of determining a printing deviation of a printed material using a sheet-fed printing machine is described. FIG. 1 is a schematic diagram of an electronic image processing system for plate making. The digital plate making data is converted into a plate making film on which a print image is drawn by a device called an image setter from a computer. After passing through a development process, the plate-making film is overlaid on a printing plate with a photosensitive material called a PS plate, exposed, and then developed to form a printing plate.

On the other hand, if a technique called computer toe plate (CTP) is used recently, digital plate making data can be obtained directly from a computer by using a device called a plate setter. However, development is required.

As described above, if a recent plate-making electronic image processing system is used, a printing plate can be obtained from digital plate-making data.

At this time, one or both of the left and right or top and bottom directions on the printing plate or plate making film are used.
At least one or more digital hands are output on the side. The digital needle mark is a needle mark created from digital plate making data in this manner, and is called to distinguish it from a handwritten needle mark.

After printing, it is possible to determine the printing state of the digital needle mark and determine the printing deviation of the printed matter.

These operations can be performed in the plate making process before printing, and it is not necessary to stop the printing press during printing. Also, it does not require the labor and skilled ability to determine the marking position well.

In addition, since the operation is simple, a plurality of needle marks can be marked. By attaching a plurality of needle marks to one side of the sheet, it is possible to determine not only misalignment of the top and bottom, left and right sheets, but also twist.

Further, there is a feature that a beautiful needle mark is provided. This has the advantage that if the angle of the needle mark with respect to the plate surface can be specified, for example, the left and right shift amounts can be quantitatively determined from the shift amounts of the needle marks.

FIG. 2 shows digital image data of a digital needle showing one embodiment of the present invention. 2, the digital image data 21 includes a long side 22, a midpoint 23 of the long side, and a short side 24 branched from the long side 22. Here, the short side 24 is branched at predetermined intervals from the long side 22 in opposite directions with the middle point 23 of the long side as a boundary, and a plurality of short sides are branched in parallel.

FIG. 3 shows digital image data of a digital needle showing another embodiment of the present invention. The digital image data in FIG. 3 is a further preferred embodiment of the digital image data in FIG. 2, in which each end of the long side 42 has short sides 35 and 36 facing in opposite directions, and when the entire long side is viewed. Indicates a zigzag structure. And
The short sides 35 and 36 have the same short side 34 as the short side 34 branched in a branch shape from the long side 32.

FIG. 4 shows a case where the sheet is misaligned when printing is performed with the printing plate having the digital needle mark. FIG. 4 is a schematic perspective view showing a state in which a print misalignment has occurred on the side surface of the stacked printed sheets. In FIG. 4, as shown on the side of the stacked printed sheets, the position deviation of the sheet can be seen from the side, and if the printing state of the digital needle mark is determined, the printing deviation of the printed matter can be determined. Can be easily done.

When making a needle mark on the electronic image processing system for plate making, digital needle mark image data is output together with the printing data. Layout software (Quark XPr
ess) or on application software for controlling a printing plate and a film output machine. However, the means is not particularly limited. However, the digital needle stamp image data is arranged at a position where half of the digital needle stamp image data is printed on a sheet as shown in FIG.

The digital needle stamp image data is PostSc
It is described in a page description language such as a RIP language. The image data described by this method is general-purpose, and can be applied to an existing plate-making electronic image processing system together with main printing data and other management material image data.

When the digital needle image data is printed on a sheet, the printing of the sheet on a printing machine (printing plate) can be performed as seen from the printing surface (top surface) and the edge surface (side surface) of the sheet as shown in FIG. In order to facilitate the discrimination of deviation, the upper surface discrimination image is an image in which a plurality of short sides (scales) branched in a branch shape at regular intervals are shaken.
An image including the long sides of angles other than 80 degrees and 270 degrees, or an image including the long sides, and an image as shown in FIG.

Further, by forming the long side in a zigzag structure as shown in FIG. 3, even when the number of short sides (scales) is increased,
The whole image can be made compact.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described, but of course the present invention is not limited to this.

A description will be given on the assumption that a CTP plate material is output, a plate is mounted on a sheet-fed offset printing press of Kikuzen format, and a sheet of Kikuzen size is printed. The printing plate size (1030 x 80) is displayed on the control application software of the printing plate output machine.
0 mm) and the paper size (939 x 63
6 mm) is arranged. The placement position is set according to the specifications of the printing machine by inputting numerical values on the control application software of the printing plate output machine.
Next, the digital needle stamp image data is arranged closer to the printer holding device on the printing press horizontal needle device side (left-right direction). The placement position is such that half of the digital needle stamp image data overlaps the print data of the paper size. In this case, it is possible to arrange the digital needle stamp image data by dragging with a mouse, but it is preferable to arrange the digital needle stamp image data by numerical input.

Similarly, the digital needle stamp image data is arranged closer to the side opposite to the printing machine holding device on the side of the printing machine horizontal needle device (left-right direction). Thereby, when the paper enters the printing press (printing plate) in an oblique direction and is printed, the digital needle stamp images printed on the upper and lower two places on the side of the horizontal needle device side are seen. It can be seen that the positions are different, and it is now possible to easily discriminate a sheet having a print misalignment in an oblique direction as compared with a case where only one place is conventionally inserted.

Although there is no concept of inserting a needle mark in the vertical direction, digital needle mark image data is also input and set in the vertical direction on the control application software of the printing plate output machine. At this time, it is desirable that the arrangement place is on the grip side, and the number is two on the left and right.
This means that the digital needle stamp image has entered the two sides, the side on the horizontal needle device side and the side on the grip side. As a result, it is possible to more easily determine the misaligned paper than in the case where the digital staple image is inserted only on one side of the paper on the side of the horizontal needle device.

The color setting of the digital needle stamp data is 1
For better color and process color printing, black or cyan is preferred.

[0038]

According to the printing misregistration determination method and digital image data of the printed matter using the sheet-fed printing press of the present invention, the misregistration of the printed matter of the printed matter can be easily performed without interruption of the printing operation and with high accuracy. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an electronic image processing system for plate making.

FIG. 2 is digital image data of a digital needle indicating one embodiment of the present invention.

FIG. 3 is digital image data of a digital needle indicating another embodiment of the present invention.

FIG. 4 is a schematic perspective view showing a state in which printing misalignment has occurred on a side surface of stacked printed sheets.

FIG. 5 is a schematic plan view showing a printing plate created by a method using digital image data in the present invention.

[Explanation of symbols]

21, 31, 56 Digital needle stamp image 22, 32 Long side 23, 33 Midpoint of long side 24, 34 Short side 35, 36 Short side facing in opposite direction to each end of long side 45 Digital needle printed Mark 46 misaligned portion of paper 47 stacked printed papers 48 units 51 printing plate 52 gripper side 53 gripper side 54 punch hole 55 paper position 57 horizontal needle device side 58 opposite side of horizontal needle device

Claims (3)

[Claims] An electronic image processing system for plate making outputs data to a printing plate or a film, and at least one or more of one or both of the left and right or top and bottom directions on the printing plate or the film. A print misalignment determining method using a sheet-fed printing press, comprising outputting a digital needle mark, determining a printing state of the digital needle mark, and determining a print misalignment of the printed matter. 2. The digital needle stamp according to claim 1, wherein
The long side is provided with a plurality of parallel short sides branched in a branch shape at predetermined intervals from the long side in opposite directions with respect to the middle point of the long side. Digital image data. 3. The digital image data according to claim 2, wherein the long side has a zigzag structure in which short sides in opposite directions are combined at both ends of the long side.