JPS60127154A - Sheet-fed offset press - Google Patents

Abstract

PURPOSE:To make it possible that the picture of a same plate is several times repeatedly printed onto the same material to be printed at a high speed without generating slippage during one rotation of a cylinder, by a method wherein the plate fitting part and the printing part with a gripper keeping the material to be printed following after it are provided on the surface of cylinder. CONSTITUTION:A cylinder S has the diameter D of 3 times the diameter (d) of two blanket cylinders B1 and B2 and the plate 2 is fitted to the plate fitting part 1 of cylinder S by the plate fixing member 3 provided to the undercut part. The printing part 4 is provided by a pitch of the circumference of blanket cylinders B1 and B2 following after the plate fitting part 1. The gripper 5 keeping the printing paper at the undercut part owned jointly with the plate fitting member 3 is provided to the front edge of printing part 4. It is necessary that the diameter of cylinder is integral times the diameter of blanket cylinders B1 and B2. The reason why it is integral times, is based upon the fact that the relative positions between the plate and the blanket cylinder and between the printing part and the blanket cylinder shall be always constant. Then, if enlarged 4 times, 5 times, etc., 3 times and 4 times repeat printings are possible, too by installing more blanket cylinders and more inking apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet-fed offset printing machine that prints the same image multiple times on the same substrate, and provides a sheet-fed offset printing machine that can obtain high-density printed images and resolution with irises precision. The purpose is to provide.

A known method of overprinting the same image on the same printed matter is as follows:
The methods used were to use a well-known single-color printing press repeatedly, or to attach plates with the same image to a multi-color printing press and perform overprinting.

However, the printing machines used in these methods originally had a mechanism for printing in multiple colors using plates for each color created by color separation.In particular, multicolor printing machines have plate cylinders, blanket cylinders, Printing cylinder 1 Each printing unit is independent,
The printing material is transferred between each unit using a delivery cylinder or the like. For this reason, it is extremely difficult to maintain and adjust the plate cylinder, blanket cylinder, printing cylinder diameter, accuracy, printing conditions, transfer accuracy, etc. in perfect condition, and it is extremely difficult to maintain and adjust the plate cylinder, blanket cylinder, printing cylinder diameter, accuracy, printing conditions, transfer accuracy, etc. Although it was sufficient for printing, it was not suitable for overprinting using the same plate.

Conventionally, another known overprinting method uses a flatbed type proofing machine, but the printing speed is extremely slow and it has been applied only to limited applications.

The sheet-fed offset printing press according to the present invention was developed in view of the above points, and is capable of high-speed and highly accurate overprinting. The sheet-fed offset printing machine of the present invention is capable of overprinting on paper, film, various types of recursive sheets, etc., and the case of paper will be described below.

The sheet-fed offset printing press of the present invention is a printing unit equipped with one cylinder, a plurality of blanket cylinders provided around the cylinder, and an inking device corresponding to the number of blanket cylinders, or an inking device and a dampening water supply device. 1
In one or more sheet-fed offset printing machines, the diameter of the cylinder is an integral multiple of the blanket cylinder, and the surface of the cylinder is equipped with a plate mounting section and a printing section that has a gripper that grips the substrate. , one of the cylinders
It is characterized in that images of the same plate can be overprinted multiple times on the same substrate during rotation without causing misalignment.

Furthermore, by appropriately connecting printing units having the above-mentioned characteristics, the same image can be overprinted on the front and bottom surfaces of the substrate, that is, both sides, or one color or multiple colors can be overprinted on one or both sides using multiple plates. do. In addition,
When printing on both sides, it is common to use plates with different images for the front and back sides, but it is also possible to use plates with the same image.

The printing press according to the present invention is extremely suitable for printing circuits, nameplate printing, etc.

FIG. 1 shows the basic model of a printing press according to the present invention, which is capable of overprinting the same image twice using one plate, and includes a paper feeding device, a delivery cylinder, a printing section, and a printing section. It is composed of a cylinder having a cylinder, two sets of dampening water supply devices and an inking device, a paper discharge device including two blanket cylinders and a paper discharge cylinder, an ink drying device, etc.

The cylinder fs) has two blanket cylinders CB+) (B
The plate (2) is attached to the cylinder (SL) by the plate fixing member (3) provided in the undercut part (11). The printing department (11) is followed by the printing department (4).
) are provided at a circumferential pitch of the blanket cylinders (B1) and (B, ). At the front edge of the printing section (4), a gripper (5) for gripping the printing paper is provided in an undercut portion shared with the plate attachment member (3). In addition,
The blanket cylinder (Bυ (B2)) is determined by the maximum size of the plate (2).The maximum size of the plate used is determined, and the blanket cylinder (Bl) is determined by the maximum size of the plate (2).

Once (B2) is determined, the diameter of the cylinder (81) is determined in consideration of the installation conditions of the dampening water supply device, inking device, plate cleaning work space, ink drying device, etc.

However, the cylinder diameter is the blanket cylinder (B+), (
It is necessary to make it an integral multiple of the diameter of B2). The reason why it must be an integral multiple is that, as is easily understood, the relative positions between the plate and the blanket cylinder, and between the printing section and the blanket cylinder must always be constant. The possible value of this integer multiple is twice or more, but realistically it is six times or more. However, if a dry offset system without a dampening water supply device is used, it is possible to double the amount. If the size is further increased to 4 or 5 times, a blanket cylinder and an inking device are added, and it is possible to perform 6 or 4 overprints.

Overprinting by the printing machine shown in FIG. 1 is performed according to the following flow. The printing unit rl that is sequentially fed from the paper feeder (F) is registered at the tip of the feeder board (Ill9), and then transferred to the gripper 〇 of the transfer drum θB by a swing gripper (1 force), and then rotated around the same rotation It is delivered to the gripper (5) of the printing section (4) of the cylinder (Sl) which rotates at a high speed.
The plate (2) fixed to the cylinder (S) by the plate attachment member (3) (3) is supplied with water by the first dampening water supply device (7) in the part (1). The first inking device (8) transfers ink to the image area, and then the ink in the image area is transferred to the first blanket cylinder (B1). Due to the rotation of the cylinder, the second dampening water supply device 04) and the second inking device (which are missing on the side of the plate (2)) are
We are entering the area of Ill.

On the other hand, when the printing paper (Pi) on the printing station (4) passes through the area of the dampening water supply device (7) and the inking device (8), contact with these devices must be broken.

As a means for this purpose, a dampening water supply device and an ink supply device relief cam (6) is provided at the printing section side end of the cylinder (S), and the cam is provided at the above device side (not shown). The device is pressed against the attached cam follower, thereby forcing the device out of contact with the printing paper. When the printing section (4) comes to the first blanket cylinder (B,) position, the blanket cylinder comes into rolling contact with the printing paper (P), and the first
The ink forming the image on the blanket cylinder (B,) is transferred image-wise to the plate (2).

Next, as the cylinder (S) rotates, the plate (2) is resupplied with υ ink by the second inking device αl.
The ink on the plate comes into contact with the second blanket cylinder (B2).
It is transferred to the blanket cylinder (B,). Then, the second print is correctly superimposed on the print #T of the printing unit (4) that subsequently arrives (on which the first tear print has not been made by the first blanket cylinder (B,) on the PI). The ink on the blanket cylinder (B,) is transferred, and the image of the same plate (2) is superimposed and printed on the printing paper (Pl.
2) The relative position of the printing paper IP+ is fixed, and the rotation of the blanket cylinder is driven by gears from the cylinder drive system, so once adjusted to ensure accurate overprinting, there will be no misalignment. There is no need to worry about printing. Note that the positions of the first blanket cylinder (B1) and the second blanket cylinder (B2) are not related to the exact overprinting conditions, and can be installed at any desired position within the range that can be punched based on the design.

Infrared or ultraviolet ink drying device (9) and 0
The second printing paper (PI The sheets are delivered to the sheet discharge cylinder α4 of the sheet discharge device and are discharged and stacked.

In addition, undercut areas 07 are provided to prevent dampening water and ink from adhering to the areas other than the plate mounting area (1) and printing area (4).
It forms a J.

Furthermore, although the embodiment shown in FIG. 1 is provided with a dampening water supply device, the dampening water supply device can be omitted if dry offset ink and a waterless printing plate are used.

Of course, even if the printing press is equipped with a dampening water supply device, dry offset printing can be performed if the device is always set in the inactive position.

FIG. 2 shows another embodiment, which is of a type that allows overprinting P on the front and back sides of printing paper P). In addition, the diagram shows a dampening water supply device, an inking device, and an ink drying device E.
etc. are omitted. These devices are provided according to the embodiment shown in FIG.

In this type of printing press, the known reversing receiver uses the passing method, in which the first printing unit centered around the cylinder S (Uυ) overprints the printing paper (Pl is the first printing unit centered on the It is transferred to the transfer cylinder by gripper 〇〇, and then the first receiver is taken over by the reversing cylinder gripper On of the reversing cylinder (to) provided adjacent to the transfer cylinder.

The end of the printing part P) transferred to the reversing cylinder (to) is sucked by the vacuum head 03. Then the second
The end of the printing paper is gripped by the transfer cylinder (4G gripper Cυ), follows the path shown by the dotted line, and is delivered to the gripper mark of the cylinder (B2) of the second printing unit (B2). Note that the second receiver is the transfer cylinder (41 gripper).
From the illustrated state, Glυ rotates in a direction opposite to the rotational direction of the transfer cylinder OQ while revolving with the rotation of the transfer cylinder OQ.

FIG. 3 shows yet another embodiment of the I type in which different images are printed on the front side of the printing paper and each image is overprinted twice. In the diagram, the dampening water supply device,
Inking devices etc. are omitted. In this model, one transfer cylinder (to) is used to transfer from the first printing unit (U+) to the second printing unit (B2), and the system allows overprinting to be performed twice on the same side. , two-color overprinting is possible.

FIG. 4 shows yet another embodiment, in which the two sets of single-sided, two-color overprinting printing presses shown in FIG. 3 are used in the embodiment shown in FIG. It is of the same type, and uses two plates each for the front and back sides.
This is a printing machine that performs overprinting twice for each plate.

FIG. 5 shows another example for overprinting on the front and back sides of printing paper, similar to the embodiment shown in FIG. 2, in which the first printing unit (Uυ and second printing unit) (B2) This type of printing press has two transfer cylinders in between, and in this case the paper ejecting device is higher than in other examples.

[Brief explanation of drawings]

Figure 1 is a diagram showing the mechanism of a printing press that overprints on one side.
Figure 2 is a mechanical diagram of a printing press that overprints on both sides, Figure 6 is a mechanism diagram of a printing press that overprints two colors on one side, and Figure 4 shows a printer that overprints two colors on both sides. Fig. 5 is a mechanical diagram of a double-sided overprinting printing machine with another reversal transfer mechanism. device, P is printing paper, s,...
B2. s,, s, is a cylinder, U, , B2
．． U. B4 is the printing unit, (1) is the number of plate removers, (2) is the plate, (4) is the printing section, (5) is the gripper-1 (6) is the cam, (force, 01 is the dampening water supply device , (8+. +111 is the inking device, (9), B3 is the ink drying device, 01 is the delivery cylinder, and (to) is the reversal cylinder. Agent: Katsutoshi Takahashi, patent attorney

Claims (1)

[Claims] One printing unit includes 11 cylinders, a plurality of blanket cylinders provided around the cylinders, and an inking device/or an inking device and a dampening water supply device corresponding to the number of blanket cylinders. In the sheet-fed offset printing 45Mtc, which has one or more sheets, the diameter of the cylinder is an integral multiple of the diameter of the blanket cylinder, and the surface of the cylinder has a plate mounting section and a gripper that grips the printing material.
What is claimed is: 1. A sheet-fed offset printing machine, characterized in that it is equipped with a printing section having a printing section, and is capable of overprinting images of the same plate multiple times on the same substrate during one rotation of a cylinder without causing any misalignment. 2 When there are two printing units, the printed material that has been overprinted with the same image on the front side in the first printing unit is sent to the second printing unit via the delivery cylinder/or the delivery cylinder and the reversing cylinder, or without passing through them. 2. A sheet-fed offset printing machine according to claim 1, wherein the reverse plate is passed over and the second printing unit overprints the same image using another plate. 5 Same - Image overprinting Printing unit is characterized in that at least two or more printing units are connected to overprint one color or multiple images of multiple colors using multiple plates on the front/or front and back sides of the substrate. A sheet-fed offset printing machine according to claim 1.