JPH02239937A - Plate finisher's slab for flat-bed press - Google Patents

Abstract

PURPOSE:To enhance the accuracy of a printing machine by mounting a plurality of grippers respectively arranged in the top and bottom as well as left and right directions of a plate finisher's slab side by side to grasp the peripheral part of a printing plate and moved independently in a tension applying direction to the printing plate capable of being fixed at a predetermined position. CONSTITUTION:A rigid printing substrate 14 preliminarily provided with a gauge pattern capable of checking a dimension is placed on a printing finisher's slab 7 and printing is applied to this printing substrate 14. Next, the positions of the respective grippers 4 of a plate finisher's slab 6 are controlled in a direction correcting the shift of the gauge pattern and the printed pattern and tension is applied to a printing plate 13 to deform said printing plate 13 so that the gauge pattern coincides with the printed pattern. Further, this work is repeated until the printed pattern is received in a tolerance dimension.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plate plate for a flatbed printing machine that prints on thick printing substrates and rigid printing substrates such as glass, metal, and resin.

[Conventional technology]

When printing on thick paper and rigid printing substrates such as glass, metal, and resin using lithographic offset printing, as shown in Figure 3,
Flatbed offset printing presses are commonly used.

Referring to FIG. 3, this offset printing machine is equipped with a mixing roller 8 for ink replenishment, a plate surface plate 6 for mounting the printing plate 13, and a printing surface plate 7 for placing the printing board 14. pedestal 9, plate surface plate 6 top and printing surface plate 7
The frame 12 is configured to reciprocate between the frame 12 and the frame 12. Further, the mount 12 includes an application roller 10 that applies ink to the printing plate 13, and an application roller 10 that applies ink to the printing plate 13, and a roller 10 that applies ink to the printing plate 13, and a roller 10 that applies ink to the printing plate 13.
4 is equipped with a blanket cylinder 11 for transferring images.

To explain the principle of printing using this printing machine, a cylindrical blanket cylinder 11 is formed from a flat printing plate 13 on which a pattern portion and a non-pattern portion are formed by photolithography on a PS plate, that is, an aluminum substrate. The ink is once transferred to the flat rigid substrate 14, and then transferred to the flat rigid substrate 14.

[Problem to be solved by the invention]

When printing using a conventional printing machine, the transfer pressure from the printing plate 13 to the blanket cylinder 11 and the transfer pressure from the blanket cylinder 11 to the printing substrate 14 are different, and the printing plate 13
Since the mask itself is made of aluminum, it is subject to uneven deformation due to expansion and contraction due to heat and internal stress when the material is rolled. Therefore, no matter how accurate the mask original plate is designed, when it is finally printed on a rigid printing board, The problem was that the image had dimensional distortion with respect to the design value, making it impossible to print with high precision.

An object of the present invention is to provide a printing plate that can perform printing while correcting dimensional distortion.

[Failure to solve the problem]

The top, bottom, left and right sides of the printing plate placed on the plate plate are gripped by gripping claws, and the gripping claws are supported movably in the vertical and leftward directions by horizontal adjustment bolts.

The positional relationship between the plate surface plate and the printing surface plate is the same as that of the conventional apparatus shown in FIG.

[Effect]

The printing plate extends in the vertical direction in proportion to the rotation of the vertical adjustment bolt, and the printing plate extends in the horizontal direction in proportion to the rotation of the horizontal adjustment bolt.

Therefore, the dimensions of the printing plate can be finely adjusted by adjusting the rotation of the vertical and horizontal adjustment bolts.

〔Example〕

In Figures 1 and 2, ■ is a platen fixed to the center of the upper surface of the base plate 2, 2a is an elongated hole provided in the periphery of the base plate 2 in the vertical and horizontal directions, and 3 is an elongated hole 2a. A nail stand fixed to the peripheral part of the base plate 2 by inserted mounting bolts 3a, 4 a biting claw pivotably attached to the nail stand 3 by a pin 3b implanted in the nail stand 3, 5 a nail stand 3 This is an adjustment bolt that adjusts the distance between the platen 1 and the platen 1, and each of the above members 1 to 5 constitutes the platen 6.

The plate surface plate 6 is mounted on the pedestal 9 of the lithographic offset printing machine shown in FIG. 3 in parallel with the printing surface plate 7, as in the conventional apparatus.

The printing plate 13 placed on the platen 1 is gripped by gripping claws 4 at its top, bottom, left and right peripheral parts.
It is positioned by being pulled from the top, bottom, left and right.

In such a device, the mounting bolts 1 and 3a of specific parts
When the adjusting bolts 1 and 5 are turned with the bolts loosened, the claw rest 3 moves and the tension applied to the printing plate 13 changes unevenly.

Since the printing plate 13 is made of aluminum, it deforms in the direction in which it is pulled. Therefore, it becomes possible to partially move and deform the pattern formed on the printing plate and correct it to match the gauge pattern.

To explain the actual work, first, a rigid printed circuit board 14 with a gauge pattern pre-attached to it so that dimensions can be checked is placed on the printing surface plate 7 (see Fig. 3).
Printing is performed on this printing board 14. Next, the positions of the respective gripping claws 4 of the plate surface plate 6 are adjusted in the direction of correcting the deviation between the gauge pattern and the printed pattern, and the printing plate 13 is
Tension is applied to deform the printing plate 13 so that the gauge pattern and the printing pattern match. This operation is repeated until the printed pattern falls within the allowable dimensions.

According to the present invention, the printing pattern is 50-100μ/300
10μ/300 even if it is distorted by mm or more
It can be corrected to about mm.

〔Effect of the invention〕

The plate plate for a lithographic printing press according to the present invention is arranged side by side in the vertical and horizontal directions of the plate plate to grip the peripheral part of the printing plate, and independently in the direction of applying tension to the printing plate. By providing a plurality of bite claws that can be moved and fixed in a predetermined position, the following effects are achieved.

The accuracy of printed patterns has improved, and offset printing can now be used to manufacture precision electrical parts such as electrical circuits and color filters.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is an enlarged side view of the nail rest portion of FIG. 1, and FIG. 3 is a side view of a general lithographic offset printing machine. 1. One pressure plate, 2. Base plate, 3. Nail stand, 4. Biting nail, 5. Adjustment bolt 1., 6. 1 plate surface plate, 7. Printing surface plate. Agent: Patent attorney: Shige Okamoto (2 persons)

Claims (1)

[Claims] A plurality of grips are arranged side by side in the vertical and horizontal directions of the plate surface plate to grip the periphery of the printing plate, and each can be moved independently in the direction to apply tension to the printing plate and fixed in a predetermined position. A plate surface plate for flatbed printing machines characterized by having sharp claws.