JPH034513Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a multicolor curved surface dry offset printing machine. More specifically, the present invention relates to a curved surface offset printing machine for performing multicolor printing on a curved surface such as the surface of a tube container.

[Prior art]

Curved surface printing machines conventionally used to print letters and designs on the surfaces of extruded tubes and hollow containers are generally four-color printing machines.

In other words, in such a curved surface printing machine, designs and characters in several colors are transferred at once onto the same transfer cylinder (blanket cylinder), and the transferred designs are further pressed against a container etc. while being pressed. It uses a printing method called transfer.
Therefore, it is difficult to obtain a wide variety of colors by printing several colors one on top of the other, and the number of colors that can be used is limited by the number of inking devices. Furthermore, the number of inking devices and plate cylinders that can be arranged around the transfer cylinder is also limited, so that a typical curved surface printing machine can only use four colors.

It is possible to increase the number of colors by enlarging the frame of the printing press and increasing the number of inking devices and plate cylinders, but it is possible to increase the number of colors by increasing the number of inking devices and plate cylinders. There is a problem in that the setup adjustment work becomes extremely complicated and takes a long time.

Therefore, there has been a demand for a curved surface dry offset printing machine that can perform multicolor curved surface printing of five or more colors with simple setup work.

[Purpose of invention]

The present invention has been made in response to such a demand, and an object of the present invention is to provide a multicolor printing curved surface offset printing machine that can perform multicolor curved surface printing of five or more colors with simple setup work.

[Structure of the idea]

The present invention includes an ink fountain whose inside is divided in the axial direction of the ink doctor by a partition plate, and an ink doctor in which a first annular groove that can be engaged with the partition plate is formed in a portion corresponding to the partition plate. and an inking device having a second annular groove formed in a portion corresponding to the first annular groove and an inking roller rotating in cooperation with the ink doctor. Multicolor curved surface dry offset printing. Regarding machines.

[Embodiment]

Next, a multicolor printing curved surface dry offset printing machine (hereinafter referred to as printing machine) of the present invention will be explained with reference to the drawings.

Fig. 1 is a schematic side view showing an embodiment of the printing machine of the present invention, Fig. 2 is a perspective view of the main parts of the printing machine shown in Fig. 1, and Fig. 3 is a schematic side view showing an embodiment of the printing machine of the present invention. FIG.

In FIG. 1, reference numeral 1 denotes a transfer cylinder, and four plate cylinders 2 are arranged around the transfer cylinder 1 so as to cooperate with the transfer cylinder 1. Each plate cylinder 2 is provided with an inking device 3 for supplying ink to the plate cylinder 2. In FIG. 1, only one inking device is shown, and the other three are omitted.

The inking device 3 includes an ink fountain 4, an ink doctor 5 for sending out the ink in the ink fountain 4, and a roller 7 for kneading the ink in the ink doctor 5.
a, and the inking roller 6 further includes a kneading roller 7a.
It is configured to supply ink to the plate cylinder 2 via the inking roller 7b.

In FIG. 1, reference numeral 8 denotes a material supply device consisting of a disk 10 etc. that is rotatably provided around a shaft 9, and a number of materials 11 (for example extrusion tubes, etc.) to be printed are placed on the outer periphery of the device.
is attached removably.

The inside of the ink fountain 4 is divided into two sections in the axial direction of the ink doctor 5 by a partition plate (not shown).
It is divided into two chambers, each containing two types of ink of different colors.

As shown in FIG. 2, a first annular groove 12 is formed approximately in the center of the ink doctor 5, and the partition plate and the first annular groove 12 engage with each other.

Therefore, the two colors of ink in the ink fountain 4 adhere to the left and right parts of the ink doctor 5, respectively.
There is no mixing.

The inking roller 6 that cooperates with the ink doctor 5 has a second annular groove 13 formed in a portion corresponding to the first annular groove 12, and its surface is divided into two in the axial direction. Therefore, the different inks do not mix together.

Note that the annular grooves 14 and 15 may also be formed in the kneading roller 7a and the inking roller 7b, if necessary.

In the printing press of the present invention constructed as described above, ink of two colors is supplied to the plate cylinder by one set of inking device 3, that is, one ink doctor 5 and one inking roller 6. can do. Therefore, by using one set of inking device 3 and plate cylinder 2 that are almost the same as those of the conventional ones, for example, as shown in FIG.
Color printing can be applied to the material 11.

Therefore, by only partially modifying a conventional curved surface dry offset printing machine having four sets of inking devices, it is possible to perform multicolor printing of up to eight colors, which is a very remarkable effect.

Moreover, since the number of plates and the number of inking devices are the same as in the past, 4 sets, the printing start adjustment time hardly increases, and the working method is almost the same as in the case of 4 colors.

The number of patterns such as the two types of characters 16 and 17 and designs displayed on the plate cylinder 2 in this invention is approximately 10.
It is preferable to arrange them at intervals of about mm, thereby preventing color mixing at the color-coded boundaries.

In the embodiment described above, the first annular groove 12 and the second annular groove 13 are formed at one location on each of the ink doctor 5 and the inking roller 6, but the printing machine of the present invention is not limited to this. Instead, the first annular groove 12 and the second annular groove 13
may be formed at two or more locations.

As mentioned above, the multicolor curved surface dry offset printing machine of the present invention can greatly improve the printing function of the conventional curved surface dry offset printing machine, which is limited to four colors, by making simple changes. Yes, and its practical value is extremely large.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an embodiment of the printing machine of the present invention, Fig. 2 is a perspective view of the main parts of the printing machine shown in Fig. 1, and Fig. 3 is a schematic side view showing an embodiment of the printing machine of the present invention. FIG. Main symbols in the drawing: 1: Transfer cylinder, 2: Plate cylinder, 3: Inking device, 5: Ink doctor,
6: Inking roller, 12: First annular groove, 1
3: second annular groove, 14, 15: annular groove.

Claims (1)

[Scope of utility model registration request] an ink fountain whose interior is divided in the axial direction of the ink doctor by a partition plate; an ink doctor in which a first annular groove that can engage with the partition plate is formed in a portion corresponding to the partition plate; A multi-color curved surface dry offset printing machine comprising an inking device having a second annular groove formed in a position corresponding to the first annular groove and an inking roller rotating in cooperation with the ink doctor.