JPH0216710B2 - - Google Patents

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 machines are widely used as printing means for general printed matter, and printing is mainly performed by 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 because, in lithographic offset printing, the entire plate of a standard size must be used even for a small printed area, 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, considering that lithographic offset printing presses are currently more widespread than letterpress printing presses, this is not practical. Therefore, a method of printing by mounting a letterpress printing plate on the plate cylinder of a lithographic offset printing machine has been devised and put into practice. This method is also called the dry offset method, but it still requires a printing plate material with a large area when printing only on a portion of the printing paper surface. Furthermore, unlike ordinary letterpress printing, the letterpress used is one in which regular images of picture characters are formed, so the same letterpress cannot be used in general letterpress printing. Furthermore, offset printing machines capable of performing dry offset have been limited in that the amount of undercut on the plate cylinder and blanket cylinder is different from other types.

The present inventors have completed the present invention as a result of various research and considerations in view of the above-mentioned drawbacks of the conventional method. That is, the present invention applies ink in a solid manner to the surface of the ink holder 2 attached to the surface of the plate cylinder 1 of an offset printing machine, and transfers the ink to the relief plate 4 attached to the required location of the blanket cylinder 3, thereby printing. This is a letterpress printing method using an offset printing machine, which is characterized by:

The present invention will be explained in more detail below based on 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 to which ink can be applied in a solid manner is used. For example, a PS plate for offset that is formed so that a solid ink adheres to the entire surface or a rubber sheet to which ink easily adheres is used. The ink is applied in a solid manner to the surface of the ink holder 2 by the ink application roller 5, and the ink is transferred from the ink holder 2 to the letterpress 4 attached to the blanket cylinder 3, and from the letterpress 4 to the printing paper 6. Printing is performed by transferring ink.

When attaching the relief plate 4 to the blanket body 3, it is preferable to attach it using an adhesive material such as double-sided tape. In order to adjust the height of the surface of the relief plate 4, a normal rubber blanket may be wrapped and pasted on the blanket cylinder 3, but a rubber blanket or other material may be placed on the blanket cylinder 3 in the necessary areas. A printing pressure adjustment table 7 made of a suitable material is provided, and a relief plate 4 is placed on it.
(See Figure 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 plate materials can be significantly reduced, and since the plate can be easily attached, printing efficiency can be improved.

[Brief explanation of drawings]

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. In the figure, 1... plate cylinder, 2... ink holder, 3...
... Blanket cylinder, 4 ... Letterpress, 5 ... Ink forming roller, 6 ... Printing paper, 7 ... Printing pressure adjustment table.

Claims (1)

[Scope of Claims] 1. A printing method characterized by applying ink in a solid manner to the surface of an ink holder attached to the surface of a plate cylinder of an offset printing press, and transferring the ink to a letterpress plate attached to a required location on a blanket cylinder for printing. A letterpress printing method using an offset printing machine. 2. The relief set forth in claim 1, characterized in that the relief plate attached to the necessary location of the blanket cylinder is a rubber blanket attached to the necessary location of the blanket cylinder, and is pasted on top of the rubber blanket. Letterpress printing method using an offset printing machine.