JPS5967515A - Letterpress printing using offset press - Google Patents

Abstract

PURPOSE:To enable efficient letterpress printing at a low cost with a conventional offset press by sticking ink solid to the surface of an ink holding body mounted on the plate cylinder surface of the offset press, transferring the ink to the letterpress mounted on the required part of a blanket cylinder and performing printing. CONSTITUTION:An ink holding body 2 is mounted on the surface of a plate cylinder 1 and a PS plate for offsetting which is so formed as to permit sticking of ink solid over the entire surface or a rubber sheet permitting easy sticking of ink is used. The ink is stuck solid to the surface of the holder 2 by an inking roll 5 and the ink is transferred to a letterpress 4 mounted on a blanket cylinder 3 from the holder 2; thereafter the ink is transferred from the letterpress 4 to printing paper 6, whereby printing is accomplished. Letterpress printing is easily performed by using a general offset printing machine without modification as mentioned above. The cost of the printing material is thus reduced considerably and since the mounting of the plate is easy, the printing efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a letterpress printing method using an offset printing machine, and an object of the present invention is to perform letterpress printing efficiently and at low cost using a conventional offset printing machine.

Currently, offset printing presses are widely used as a printing means for general printed matter, and printing is performed using a lithographic printing method. However, in many cases, parts are printed using a letterpress printing method. For example, imprinting of store names on printed calendars is often done separately using a letterpress printing method. This is mainly due to the fact that in lithographic offset printing, the entire plate of a standard size must be used even for a small printed portion, which increases the cost of the plate material.

However, printing a printed matter that has already been lithographically printed using a letterpress printing machine causes a lot of loss in the process.

Furthermore, it is not practical considering that lithographic offset printing presses are currently more widespread than letterpress printing presses.

Therefore, a method of printing by attaching a letterpress printing plate to the plate cylinder of a Heijo offset printing machine has been devised and put into practice. This method is also called the dry offset method,
Printing on only a portion of the printing paper still requires a printing plate material with a large area. Furthermore, unlike ordinary letterpress printing, the letterpress used is one on which regular image characters are formed, so the same plate cannot be used for general letterpress printing. Furthermore, offset printing machines that can carry out dry offset have a different amount of undercut on the plate cylinder and blanket cylinder, and are therefore limited.

The present inventors have completed the present invention as a result of various research and considerations in view of the various drawbacks of the conventional methods described above. That is, the present invention has the following advantages: (1) ink is applied in a sloppy manner to the 2 surfaces of the ink holder attached to the surface of the plate cylinder 1 of the printing press;
This is a letterpress printing method using an offset printing machine, which is characterized by transferring ink and printing.

The present invention will be explained in more detail below with reference to the drawings.

FIG. 1 shows an overview of one embodiment of the present invention. An ink holder 2 is attached to the surface of the plate cylinder 1. As the ink holder 2, a sheet-like member capable of carrying so-called solid ink is used. For example, a 28 plate for offset that is formed so that a solid ink adheres to the entire surface, or an ink-applied tM
'L, easy gomunt etc. are used. Roller 5 for ink deposition
Thus, the ink is deposited on the ink holder 2, and the ink is transferred from the ink holder 2 to the letterpress 4p attached to the blanket cylinder 3t, and the ink is transferred from the letterpress 4 to the printing paper 6t. Printing is performed by transfer.

At this time, it is preferable to attach the relief plate 4 to the blanket cylinder 3 using an adhesive such as double-sided tape.

To adjust the height of the surface of letterpress 4, press blanket cylinder 3.
This may be applied on a rolled ordinary rubber blanket, but a printing pressure adjustment table 7 made of a rubber blanket or other suitable material is provided at the necessary part on the blanket cylinder 3, and then It is preferable to attach the letterpress 4 to the plate (see Fig. 2).

As explained above, according to the present invention, letterpress printing can be easily performed using a general offset printing machine without modification. Therefore, the cost of the plate material can be significantly reduced, and since the plate can be easily attached, the printing efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 shows a partially enlarged view of an embodiment of the invention. %l in the figure... Plate cylinder 2... Ink holder 3
... Blanket body 4 ... Letterpress version 5 ...
・Ink is deposited on roller 6...Printing paper 7...
Print pressure adjustment table Patent applicant Nissha Printing Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. Printing is carried out by applying sticky ink to the surface of an ink carrier attached to the surface of the plate cylinder of an offset printing press, and transferring the ink to a letterpress plate attached to the required location on the cylinder. A letterpress printing method using an offset printing machine characterized by: 2. The letterpress attached to the required part of the blanket body is
A letterpress printing method using an offset printing machine according to claim 1, characterized in that rubber blanket bridges are provided at necessary locations on the blanket cylinder and are adhered thereto.