JPH0440925Y2 - - Google Patents

Description

[Detailed description of the invention] {Industrial field of application} The present invention relates to printing machines, particularly so-called waterless lithographic printing machines that do not require dampening water for ink repulsion.
More specifically, the present invention relates to a printing machine in which an ink supply section consisting of a plurality of inking rolls is equipped with a cooling means.

{Prior Art} FIG. 4 is a schematic diagram showing an ink supply section 2 of a conventional printing press. In FIG. 4, the ink supply section consists of a plurality of inking rolls 2 whose surface layer portions are a combination of a rubber roll and a metal roll, and among the plurality of inking rolls, a metal roll R
The plate cylinder 3 ultimately prevents the temperature of the plate cylinder 3 from rising by passing water cooled to a necessary temperature thereinto to cool the ink supplied from the ink fountain 21 to the surface of the roll.

The purpose of cooling in the printing press is to prevent ink buildup on the non-image areas of the plate due to a decrease in ink cohesive force due to heat generation at the shear stage. Further, in general, the inking roll group is rotated while the metal roll R and the rubber roll are alternately in contact with each other, and the metal roll is further rotated while being oscillated in the axial direction. Then, the ink is kneaded and uniformly dispersed, and the ink is supplied toward the plate cylinder 3.

{Problem that the invention attempts to solve} In general, most conventional offset printing machines are
Except for high-speed machines, there are few machines with built-in water cooling rolls like the one mentioned above. Further, the water cooling roll generally has a swinging mechanism, the bearing portion of which is integrally assembled with the frame, making the mechanism complicated and requiring time and effort to remove and install.

On the other hand, in an offset printing machine, the plate is cooled by dampening water, but when this printing machine is applied to waterless planography, this dampening water cannot be used, so cooling with the dampening water is not possible. It's impossible.

In order to modify the metal rolls to water-cooled type in such conventional printing presses, the metal rolls have an axial swing mechanism as described above, so it would require a large amount of money, the effort required for the modification, and the machine setup. The loss due to the outage is extremely large.

An object of the present invention is to provide a printing press equipped with a cooling device that is inexpensive and can be easily applied to existing printing presses, in order to solve the problems of the prior art as described above.

{Means for solving the problem} The present invention has the following configuration to achieve the above object. That is, in a printing machine equipped with an ink supply section whose surface layer is composed of an inking roll composed of a rubber roll and a metal roll, the rubber roll contains a metal or a substance with good heat conductivity in the rubber. This is a printing press characterized by being constructed of the following types of printing presses and equipped with a mechanism for circulating cooled liquid inside the press.

The present invention will be explained in more detail using examples and with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a printing machine according to the present invention.

FIG. 2 is a plan cross-sectional view of a roll (hereinafter referred to as water-cooled rubber roll) preferably used in the present invention, the surface layer of which is made of rubber containing metal or a material with good heat conductivity, and which is equipped with water cooling means inside.

FIG. 3 is a schematic diagram showing the support relationship of the water-cooled rubber roll of the printing press according to the present invention.

The main parts of the present invention include an inking roll group 2 including a water-cooled rubber roll 1, and a printing cylinder 3.

A nozzle 16 having a cooling water inlet 4 as shown in FIG. 2 is provided at one end of the water-cooled rubber roll 1, and the cooling water inlet 4 is connected to a water pump 5 as shown in FIG. water cooler 6 and piping 7 with
connected by. On the other hand, water-cooled rubber roll 1
A nozzle 1 having a cooling water outlet 15 at the other end.
6' is provided, and the cooling water outlet 15 is
It is connected to the water cooler 6 via piping 8.

As shown in FIG. 2, the water-cooled rubber roll 1 has a hollow hole 9a connected to the cooling water inlet 4 of the nozzle 16 at one end, and a hollow hole 9a connected to the outlet 15 of the nozzle 16' at the other end. A rotating roll 11 whose surface is integrated with a rubber layer 10 containing metal or a good heat conductive substance is rotatable through a bearing 12, a sealing material 13, and a retaining ring 14 with respect to a fixed shaft 9 having a hole 9b. A gap is provided between the fixed shaft 9 and the rotating roll 11 to form an annular passage 18 communicating from the cooling water inlet 4 to the outlet 15. Furthermore, the aforementioned nozzles 16 and 16' are screwed onto the fixed shaft 9 at both ends of the water-cooled rubber roll, respectively.

17 is a roll support stand on the printing press side. As shown in FIG. 3, the support stand 17 has a U-shape, and is supported by two metal rolls 19 by simply dropping the water-cooled rubber roll 1 from above, and lifting of the rubber roll 1 is handled separately. This is prevented by a rider roll 20 that is pressed by a spring (not shown). In other words, if the rubber part is damaged, it can be easily replaced with a new roll.

{Function} Next, the function of the printing press according to the present invention will be explained. Water, which has been automatically cooled in advance to a desired temperature by the water cooler 6, is sent to the nozzle 16 of the water-cooled rubber roll 1 via the piping 7 by the water pump 5. The water enters the cooling water inlet 4, passes through the hollow hole 9a of the fixed shaft nozzle 9, the annular passage 18 of the fixed shaft 9 and rotating roll 11, the hollow hole 9b of the fixed shaft nozzle 9, and the discharge port 15 of the nozzle 16'. It is returned to the cooler 6 via piping 8.

On the other hand, the ink that is kneaded and supplied from the ink fountain 21 to the rotating inking roll group 2 is cooled by the cooling water circulating inside the water-cooled rubber roll 1 in the roll group 2. It is cooled to a desired temperature via the rubber layer 10 containing a thermal substance, applied to the image area of the rotating plate cylinder 3, transferred to a bracket cylinder (not shown), and fed while being pressed by an impression cylinder. Printed on predetermined printing paper.

Aluminum filler is preferably used as the metal contained in the surface rubber of the water-cooled rubber roll 1, but other metals may be used. Furthermore, carbon or the like can be used as the material with good heat conductivity. The cooling effect can be increased by mixing a large amount of these metals or materials with good thermal conductivity into the rubber layer, but on the other hand, the hardness of the rubber increases and the uniform dispersion of the ink tends to decrease.
Desirably 50Vol% or less.

Further, the metal roll may be one whose surface is lined with resin.

{Effects} Since the present invention has the above configuration, it has the following excellent effects.

Since the ink is cooled with a water-cooled rubber roll that has a rubber layer containing metal or a good heat conductive substance on the surface and has a water cooling means inside, the heat conductivity is higher than that of a normal rubber layer. Therefore, it has an excellent cooling effect, and can be easily installed and removed even in conventional printing machines without having to modify the metal roll with a swinging mechanism to a water-cooled type. There is no loss when the machine stops, and it can be easily applied to existing printing presses.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a printing machine according to the present invention. FIG. 2 is a plan sectional view of a water-cooled rubber roll preferably used in the present invention, the surface layer of which is made of rubber containing metal or a material with good heat conductivity, and which is equipped with water cooling means inside. FIG. 3 is a schematic diagram showing the support relationship of the water-cooled rubber roll of the printing press according to the present invention. FIG. 4 is a schematic diagram showing the ink supply section 2 of a conventional printing press. 1... Water-cooled rubber roll, 2... Inking roll group, 3... Plate cylinder, 4... Cooling water inlet, 5...
Water pump, 6... Water cooler, 7, 8... Piping, 9
... Fixed shaft, 9a, 9b ... Fixed shaft hollow hole, 10
... Rubber layer, 11 ... Rotating roll, 12 ... Bearing, 13 ... Seal material, 14 ... Retaining ring, 1
5... Cooling water drain port, 16, 16'... Nozzle,
17...Roll support stand, 18...Cooling water passage, 1
9... Metal roll, 20... Rider roll, 21
...An inkwell.

Claims (1)

[Scope of utility model registration request] In a printing machine equipped with an ink supply section consisting of an inking roll whose surface layer part is a combination of a rubber roll and a metal roll, the rubber roll has a metal or a good heat conductive substance contained in the rubber. What is claimed is: 1. A printing press that is made up of a material and is equipped with a mechanism that circulates a cooled liquid inside.