JPH0552502A - Accuracy-measuring device of offset printer - Google Patents

Abstract

PURPOSE:To measure an accuracy of a blanket drum, etc., of an offset printer which is used for printing a pigmented layer of a color filter. CONSTITUTION:A title item consists of a support 2 which is placed on a reference surface at both sides of a measurement point while straddling the measurement point and a measuring equipment-mounting portion 3 straddling the measurement point, a plurality of dial gauges 4 which a high accuracy, etc., can be mounted to the measuring equipment mounting portion, they are placed on the reference surface previously for adjusting zero point of the dial gauges 4 etc., and then enabling an accuracy of each portion which affects printing accuracy of cylinders such as a blanket drum to be measured, or a printing surface plate, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device capable of easily measuring a portion such as a blanket cylinder of an offset printing machine, such as cylinders and a printing platen, which has an influence on the accuracy of the printing machine. The present invention relates to an apparatus for measuring the accuracy of each part of an offset printing machine used for forming a colored layer of a color filter used in a liquid crystal display device that requires printing accuracy by printing.

[0002]

2. Description of the Related Art In a liquid crystal display device, a transparent substrate such as glass provided with a transparent electrode is provided with a space of about 1 to 10 μm and a liquid crystal substance is enclosed between them, and the liquid crystal is kept constant by a voltage applied between the electrodes. The image is displayed by orienting in the direction to form a transparent portion and an opaque portion. In a color liquid crystal display device, three color filters of red (R), green (G), and blue (B) corresponding to the three primary colors of light are provided on one of the transparent electrode substrates, and the voltage applied to the transparent electrode is applied. By controlling the transmission of light of the liquid crystal, the amount of light transmitted through the filters of three colors R, G, and B is controlled, and color display is performed by coloring by adding the three primary colors.

The colored layer formed on the color filter is
A photosensitive resin containing pigments or dyes of three primary colors of red, green, and blue is used by a photolithography method, or a colored layer having a predetermined pattern is formed by an ink containing pigments or dyes. The formation of the coloring layer provided on the color filter was mainly performed using an ink containing a dye or a pigment on a pattern formed by photolithography using a photosensitive resin, but the formation process of the coloring layer is more difficult than that of photolithography. A simple printing method is also adopted.

However, the printing method forms a pattern of ink containing a pigment or a dye by a printing machine, but the printing of the colored layer of the color filter requires extremely high accuracy unlike ordinary printing. There is. Although various factors affect printing accuracy, the first condition for precise printing is to sufficiently adjust the mechanical accuracy of each part of the printing machine.

In order to print a colored layer of a color filter using an offset printing machine, a sheet-fed offset printing machine used as a proofing machine as shown in FIG. 4 is used. This offset printing machine applies ink using an ink roll 11 to an offset original plate 10 on which a predetermined printing pattern of a color filter is placed on a platen 9, and then rolls a blanket cylinder 12 on the offset original plate. Then, the pattern of the original plate is transferred onto a blanket, and then the pattern on the blanket is transferred onto the substrate 14 placed on the printing platen 13. This operation is performed for each color to print three colors.

In such a printing machine, the precision of the platen plate and the plane of the printing platen as well as the shape of the blanket greatly influence the printing accuracy.

The blanket cylinder is shown in a plan view in FIG. 5 and in a sectional view taken along the line AA in FIG. 5 in FIG. Is equipped with a blanket mounting device 17 for mounting the blanket 16 and adjusting the tension of the blanket and a blanket tension adjusting device 18, and the tension of the blanket is adjusted by a plurality of tension adjusting bolts provided in the axial direction of the blanket cylinder. The diameter of the blanket surface is adjusted to be uniform.

The blanket cylinder has a cloth layer 1 made of cotton or the like.
9, a buffer layer 20 made of sponge-like rubber, and a blanket 16 made of synthetic rubber such as EPDM (ethylene propylene diene monomer). A cylinder gauge 21 as shown in FIG. 7 is used to measure the winding diameter when the blanket is wound. The dial gauge 23 is attached to the cylinder gauge, and the measurement is performed by the indication of the stylus at the tip of the dial gauge. The blanket winding diameter is measured as shown in FIG. The leg portion 22 is placed on the blanket 16, and the tip of the stylus of the dial gauge provided on the cylinder gauge 24 is brought into contact with the surface of the bearer 25 that is precisely machined to the same diameter as the blanket cylinder to contact the dial gauge. The winding diameter of the blanket is measured from the reading.

[0009]

However, in such a conventional cylinder gauge, the reference of the cylinder gauge is the surface of the blanket with which the surfaces of the legs of the cylinder gauge are in contact. If the center is concave or convex compared to both ends in a spool or barrel shape, it is difficult to measure the precise winding diameter, and when printing the colored layer on the glass substrate for the color filter. When the accuracy of printing is required like the above, the purpose could not be achieved even by using the cylinder gauge.

[0010]

Means for Solving the Problems As a result of researching means for solving the above-mentioned problems, the present inventors have straddled a measurement point and straddled a support placed on a reference plane on both sides of the measurement point and the measurement point. It consists of a measuring device mounting part, and the measuring device mounting part is provided with at least one displacement measuring device,
It has been found that it is possible to measure easily and accurately.

That is, in the conventional cylinder gauge, the reference surface of the gauge is in line or surface contact with the blanket surface, and the stylus portion of the dial gauge is in contact with the reference bearer surface. Place the support of the measuring device on a standard reference surface, and attach a displacement gauge such as a dial gauge or a laser micro-displacement meter at a predetermined position of the gauge mounting part that is connected to the support, and position the blanket at any position. This makes it possible to accurately measure the winding diameter of.

[0012]

In the accuracy measuring device of the offset printing machine, at least one measuring device mounting portion is composed of a support body that is placed on the reference surfaces on both sides of the measuring location and a measuring instrument mounting portion that straddles the measuring location. Since the displacement measuring device is provided, the precision of each part including the blanket of the offset printing machine can be precisely measured, although the device has a simple structure.

[0013]

EXAMPLES Examples of the present invention will be described below in detail. FIG. 1 shows a perspective view of an accuracy measuring device 1 of an offset printing machine according to the present invention. This measuring device is composed of a support 2 and a measuring device mounting portion 3, and the measuring device mounting portion has a predetermined number. A displacement measuring device 4 such as a dial gauge is attached. As shown in the figure, the displacement measuring device is mounted by making a hole in the measuring device mounting part, and in this case the measurement position is fixed, but if a groove is provided instead of the hole, the displacement measuring device can be measured at any position. Can be attached.

Further, in order to maintain accuracy, the contact surface 5 of the support to the reference surface is made as small as possible, and when the reference surface is a flat surface, it is formed as a smooth surface, and the bearer surface is used as the reference surface. In this case, the shape can be adapted to the curvature of the bearer surface as shown in FIG.

When a cylindrical surface such as a blanket is measured using the measuring apparatus of the present invention, it is necessary to accurately calibrate the reading of the displacement measuring device. For that purpose, the displacement measuring device mounting portion is dialed. As shown in FIG. 3 after mounting a gauge or the like, a reference cylinder 7 is placed on a pedestal 6 that prevents the cylinder from rolling, and the measuring device 1 of the present invention is placed on the reference cylinder having the same diameter as the bearer of the printing machine. The probe 8 of each displacement measuring device 4 is placed and brought into contact with the reference cylindrical surface, and the reading of each displacement measuring device at that time is used as the reading of the reference surface, or the zero point of the measuring device is adjusted.

When a flat surface such as a printing platen is measured, the measuring apparatus of the present invention is placed on a reference plate and adjustment is performed in the same manner.

The reference cylinder or reference plate, which serves as a reference for measurement, has its surface ground and then precisely finished by polishing or the like, and is further heat-treated to prevent distortion due to strain or temperature change during machining. Further, in order to minimize a measurement error caused by expansion or contraction due to temperature change, it is preferable to use aluminum alloy 7075 or the like as the material of the reference cylinder or the reference plate.

Example 1 A member made of an aluminum alloy 7075 having a shape shown in FIGS. 1 and 2 and having a mounting portion 3 of a displacement measuring device having a length of 700 mm and a wall pressure of 10 mm was used. The corner of the contact portion 5 to the reference surface is cut according to the curvature of the bearer, and 9 holes of 8 mm diameter are provided at the mounting portion 3 of the displacement measuring instrument at intervals of 50 mm, and each of these holes has a measuring range 2
An accuracy measuring device of the present invention was constructed by attaching a dial gauge having a measurement accuracy of 0 mm and higher than ± 10 μm. Support part 2
In order to prevent the mounting portion 3 of the displacement measuring device from bending downward due to its own weight to cause a measurement error, the mounting portion 3 of the displacement measuring device is supported in the longitudinal direction.

Accuracy measurement of an offset printing machine in which a reference cylinder made of steel having a length of 800 mm and a circularity of ± 5 μm or less on the surface is installed on a stand having a V-shaped groove, and a dial gauge is attached on the reference cylinder. The device was placed and the zero point of the dial gauge was adjusted.

The support of the precision measuring device with the dial gauge adjusted is placed on the bearer surface of the blanket of the printing machine used for printing the color filter, and the stylus of the dial gauge is brought into contact with the blanket surface to bring the blanket into contact. The surface irregularities were measured. FIG. 9A shows the result of the measurement performed by rotating the blanket in order to measure the unevenness on the entire surface of the blanket. After adjusting the blanket based on this result, a highly accurate blanket could be finally obtained as shown in FIG. 9 (B).

[0021]

INDUSTRIAL APPLICABILITY The present invention is an accuracy measuring device such as a blanket of a printing machine used for printing with extremely high accuracy, such as when a colored layer of a color filter used for a liquid crystal display device is manufactured by a printing method. There is at least one displacement gauge such as a dial gauge in the measuring instrument mounting part, which consists of a support placed on the reference surface on both sides of the measuring point and a measuring instrument mounting part that straddles the measuring point. Since it is provided, it is possible to measure the unevenness of the entire blanket surface, which was difficult with the conventional cylinder gauge, with high accuracy by a device having a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of an accuracy measuring device of an offset printing machine.

FIG. 2 shows a side sectional view of an accuracy measuring device of an offset printing machine.

FIG. 3 is a diagram showing zero point adjustment by a reference cylinder.

FIG. 4 is a diagram showing a schematic view of a sheet-fed offset printing machine.

FIG. 5 is a diagram showing a plan view of a blanket.

6 is a cross-sectional view of the blanket taken along the line AA in FIG.

FIG. 7 is a diagram showing a cylinder gauge.

FIG. 8 is a diagram showing a method of using a cylinder gauge.

FIG. 9 is a diagram showing the accuracy of the blanket before and after the adjustment is performed using the accuracy measuring device of the offset printing machine of the present invention.

[Explanation of symbols]

1 ... Accuracy measuring device of offset printing machine, 2 ... Support, 3
… Measuring instrument mounting part, 4… Displacement measuring instrument, 5… Contact surface, 6
... Stand, 7 ... Standard cylinder, 8 ... Stylus, 9 ... Plate surface plate, 10 ...
Offset original plate, 11 ... Ink roll, 12 ... Blanket cylinder, 13 ... Printing platen, 14 ... Substrate, 15 ... Inside of cylinder, 1
6 ... Blanket, 17 ... Blanket mounting device,
18 ... Blanket tension adjusting device, 19 ... Cloth layer, 20 ...
Buffer layer, 21 ... Cylinder gauge, 22 ... Cylinder gauge leg, 23 ... Dial gauge, 24 ... Stylus, 25 ... Bearer

Claims (1)

[Claims] 1. An accuracy measuring device for an offset printing machine, comprising: a support body that straddles measurement points and is placed on reference surfaces on both sides of the measurement points; and a measuring instrument mounting portion that straddles the measurement points,
An accuracy measuring device for an offset printing machine, wherein at least one displacement measuring device is provided at a measuring device mounting portion.