JPH0747310B2 - Register for printing - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to print quality control, and more particularly to a printing register target capable of quantitatively visually confirming register accuracy.

(Prior Art) Registration accuracy is one of the characteristic factors that determine print quality.

This registration accuracy refers to the degree to which an image line shifts in the top-bottom direction or the left-right direction in a single printing unit or between a plurality of printing units.

In the above case, when the printing is performed many times in a single-color machine having only a single printing unit or a specific printing unit of a multi-color machine, what is the degree of variation in register among many printing papers? This variation is due to the printing machine itself and is therefore a very important factor in inspecting the basic performance of the printing machine.

Further, in the above case, for example, between four printing units in a four-color machine, how much the registration of the succeeding printing unit is misaligned with respect to the specific printing unit, and eliminate this misregistration. In order to do so, the mechanism for register accuracy in the printing press must be modified.

By the way, the register accuracy required of recent printing machines is 2/10.
It is a very small order such as 0 mm, and it is desired to reduce the inspection time and labor for register accuracy as much as possible, and further, the waste paper required for register check must be minimized.

Conventionally, as a register target used to check register accuracy, + marks (so-called register marks) are printed in the margins of the paper, and the amount of misalignment between the + marks is magnified with a loupe. It was measured on the scale.

However, when such a + mark type registration target is used, it takes a lot of time and effort to perform the check work. Above all, the basic drawback of the + mark type is to bring the + marks close to each other in order to decode the shift amount. It has the problem of having to.

There is a technique disclosed in U.S. Pat. No. 4,273,045 as an improvement of the + mark type register target. However, since this technique is basically only the + mark type, it is difficult to read as described above. The disadvantage is that the amount of misalignment cannot be known unless magnified with a magnifying glass.

SUMMARY OF THE INVENTION Accordingly, a primary object of the present invention is to provide an advanced register register for printing.

Another object of the present invention is to provide a register target for printing, which can visually recognize a specific numerical value of the register error.

Yet another object of the present invention is to save working time and labor,
An object of the present invention is to provide a printing register target that can recognize a register error at first glance.

In order to achieve the above-mentioned object, in the printing register target according to the present invention, a plurality of lines having a constant width are arranged side by side in the same direction at the same intervals as the line width, and one measurement is performed. Parts are constructed, and several sets of measurement parts are formed by gradually changing the line widths and intervals, and several sets of measurement parts are juxtaposed with the line direction of all measurement parts being the same. .

As a result, the measurement part corresponding to the register error is completely covered during the inspection, so that the specific value of the register error can be visually confirmed. Therefore, it is possible to save the time and labor and to accurately check the register error, which greatly contributes to the management of the print quality.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of a register target according to the present invention, which is an enlarged view of what is used for actual printing, and FIG. 2 is shown in FIG. It is a partially enlarged view of FIG.

The register target according to the present invention is the pattern itself which is enlarged and shown in the drawing, and a line having a certain width (indicated as a literal black line in the drawing) has a line width (in line thickness). The same spacing (shown as a blank in the drawing) and a plurality of parallel arrangements in the same direction constitute one measurement part.

Explaining this measurement part, one group is a measurement part in which the minimum order, for example, 2/100 mm is selected as the basic dimension a for checking the register accuracy, and the line width and the interval are set to this a.

In FIGS. 1 and 2, the line width and spacing of the measurement part P1 is a, the measurement part P2 is 2a, and the measurement part P3.
, 4a ..., and several sets of measurement parts P1, P2, P3.

That is, the steps of line width and spacing are integer multiples of the basic dimension a,
It is preferably an even multiple, and the juxtaposition order of the measurement parts is the same as the order of the line width and spacing steps (a, 2a, 4a ...).

Further, the juxtaposition direction of the respective measurement parts is the left-right direction of the drawing, whereas the line is the up-down direction of the drawing, and therefore the two directions are at right angles to each other.

However, the juxtaposition direction of the measurement parts and the direction of the filament may be the same direction as shown in another embodiment of FIG. However, in any case, the alignment directions of the filaments of all measurement parts must be the same.

Then, the register target according to the present invention is formed on the edge portion of the plate, and is thus printed on the margin portion of the paper.

Next, the use mode of the register target according to the present invention will be described. When a large number of sheets are continuously printed in a single printing unit of a multicolor machine, a plate with the register target according to the present invention is attached. Before the ink of the printing unit dries, it moves to the blanket of the subsequent printing unit (no plate or ink) along with the paper, so that the residual ink is overlaid on the paper of the next line immediately after. Move. Therefore, if there is a register error in the printing of the preceding and next lines of paper that are printed continuously,
The offset printing targets are printed on a sheet of paper by a printing unit with a plate and a printing unit without a plate. In other words, the register target is overlaid and the register error can be checked simply by attaching the plate to a single printing unit and performing continuous printing. This registration error is due to the mechanical accuracy itself of the printing unit and is related to the basic performance of the printing machine, so it is strictly checked during manufacturing.

The operation and effect of the register target according to the present invention in the above-described use mode will be described. When the register error is a which is the same as the basic dimension, as shown in FIG. Only the part P1 is flatly crushed into a so-called solid state, and the other measurement parts are still left with a blank.

Therefore, the specific numerical value of the misregistration (in this case, the fact that there is a registration error of a in the left-right direction in FIG. 4) can be recognized at a glance without magnifying with a magnifying glass.

When the registration target is overlaid as shown in Fig. 5, the measurement part P2 where the line width and spacing is 2a.
Only the solid state, so in the horizontal direction of the drawing
The fact that there is a registration error of 2a can be recognized visually and as a concrete numerical value.

As a result, the management of the print quality described above becomes very simple.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a printing register target according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a plan view showing another embodiment. FIG. 4 and FIG. 5 are partially enlarged views showing a state in which the registration target is overlaid. P1, P2, P3 ... Measurement part.

Claims (1)

[Claims] 1. A single measurement part is constructed by arranging a plurality of filaments having a constant width side by side in the same direction and at the same intervals as the line width, and varying the line width and the interval stepwise. A registration register for printing is formed by forming several sets of measurement parts, and arranging the measurement parts in parallel, with the arrangement directions of the filaments of all the measurement parts being the same.