JPH0510226B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an ink collection and cleaning device for an ink transfer mechanism, and more particularly, it is used when changing ink colors in a printing press due to a change in printing order. The present invention relates to an ink recovery and cleaning device that enables rapid ink recovery and cleaning in an ink transfer mechanism, thereby saving ink and cleaning water, and achieving a significant reduction in setup time.

BACKGROUND ART For example, in a flexo printing apparatus, as shown in FIG. It is adapted to be supplied to the contact area α in the longitudinal direction of the rolls 10, 12. This ink is uniformly squeezed between both rolls and formed as an ink film on the anilox roll 10,
This is transferred to the printing plate 20 wrapped around the printing cylinder 18. The reference numeral 22 represents an impression cylinder, and 24 represents an ink collection box.

Problems to be Solved by the Invention During this printing operation, when a predetermined printing order is completed and the next order is to be printed using ink of a different color, the ink color must be replaced (color change). That is, the ink used in the previous order remaining on the surfaces of the rolls 10 and 12 and the inner wall of the ink supply pipe system 26 is recovered, and then cleaning water is supplied to the ink adhesion zone to remove the ink. After cleaning, a color change operation is required to supply ink of another color. However, since the ink remaining in the ink collection box 24 and the pipe system 26 has a unique viscosity, it takes time to recover it naturally due to its own weight, and if the ink is not completely recovered, the cleaning water Since the ink is washed away by supplying it, there are various disadvantages such as a large amount of ink loss and the need for a large amount of washing water.

Purpose of the Invention The present invention has been proposed to solve the above-mentioned drawbacks inherent in the ink transfer mechanism of a printing press according to the prior art. The purpose of this invention is to shorten cleaning time and reduce loss of ink and cleaning water by allowing the ink to be quickly recovered with almost no residue remaining.

Means for Solving the Problems To achieve the above object, the present invention provides an anilox roll rotatably provided in a printing press, and an ink roll rotatably disposed in contact with the anilox roll in the longitudinal direction. , an ink transfer mechanism consisting of an ink collection box disposed at the ends of both rolls, facing the longitudinal contact area between the anilox roll and the ink roll, and selectively supplying ink and cleaning water to the area. a first pipe system that faces the ink collection box and selectively collects ink and cleaning water independently of the first pipe system; and the anilox roll. A third pipe facing the longitudinal contact area with the ink roll and selectively recovering ink and wash water independently of the first pipe system.
a pipe system, the second pipe system and the third pipe system are connected in communication with a negative pressure source, and the ink and cleaning water remaining in the longitudinal contact area of both the rolls and the ink collection box are subjected to negative pressure. It is characterized in that it is configured to be recovered by action.

Embodiment Next, a preferred embodiment of the ink recovery and cleaning device for the ink transfer mechanism according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 shows a schematic configuration of an embodiment of the ink recovery and cleaning device, in which the anilox roll 10 and the ink roll 12 are shown in a plan view, and the plate cylinder 18 and press roll 22 shown in FIG. has been omitted.

As shown in the figure, a first line system 28 is led out from the ink reservoir 14 for selectively supplying ink and wash water, and this first line system 28 has a switching connection with a wash water supply line 66. Its open end is connected to the anilox roll 10 and the ink roll 1 via the switching valve 30 and the ink supply pump 32.
It faces an ink transfer mechanism 34 consisting of two parts.
That is, the open end of this pipe system 28 is connected to both rolls 1.
Facing above the longitudinal connection area α of 0 and 12,
A fixed amount of ink is always supplied from the ink reservoir 14.

Both rolls 1 in the ink transfer mechanism 34
Ink collection boxes 2 are installed at both longitudinal ends of 0 and 12.
4 and 24 are arranged, and the surplus ink supplied to both rolls via the first pipe system 28 flows in the longitudinal direction along the contact area α and is collected in each ink collection box 24. It is becoming more and more common. At the bottom of the collection box 24, there is a second pipe system 26 that mainly collects ink and selectively collects cleaning water.
One open end of the two is connected in communication. The other open end of the second pipeline system 36 is connected to a negative pressure box 38 having the shape shown in the figure. This negative pressure box 38 is a negative pressure source 4 typified by a suction pump.
0 so that a negative pressure can be created inside the box when selected. Further, the bottom of the negative pressure box 38 is mainly connected to a conduit 42 for ink discharge, and this conduit 42 is further connected to a switching valve 4 which is selectively connected to a recovery pump 44 and an external drain pipe 45.
6, the ink is returned to the ink reservoir 14.

Note that the negative pressure box 38 communicates with the second pipeline system 36.
The negative pressure is not always generated by the negative pressure source 40 connected thereto, but the negative pressure is released during normal printing operation. Therefore, the ink supplied between the rolls 10 and 12 is collected in the ink collection box 24 and then sent to the ink reservoir via the second pipeline system 36 and the negative pressure box 38 (from which the negative pressure has been released). 14 by its own weight, allowing natural circulation of the ink.

Next, both the rolls 10 to which ink is supplied,
A large number of third conduit systems 48, each having one opening close to the longitudinal contact area α between the pipes 12 and 12, are arranged and fixed on the support rod 50 at predetermined intervals. This third pipeline system 48 is capable of selectively recovering ink and cleaning water during color change work, and a telescopic pipe 54 such as a rubber pipe is interposed and connected in the middle of the pipeline system 48. At the same time, each third pipe system 48 is connected to one recovery pipe 56. The recovery pipe 56 is connected to the negative pressure box 38 via an on-off valve 58. The support rod 50 extends parallel to the rolls 10 and 12 without contacting them, and has both ends fixed to a moving member of a linear actuator 52, typically a pneumatic cylinder. By the urging of both the actuators 52, 52, the support rod 50 and the third pipe system 48 arranged and fixed thereto in large numbers move parallel to and close to the longitudinal contact area α of both the rolls 10, 12. , and are becoming more distant.

Effects of the Embodiment Next, the effects of the ink recovery and cleaning device configured as described above will be explained. In the embodiment shown in FIG. 2, the ink supply pump 32 rotates to draw ink from the ink reservoir 14 to the
The ink is supplied between the rolls 10 and 12 of an ink transfer mechanism 34 provided in a printing press (not shown). The surplus of the supplied ink flows toward both ends of the longitudinal contact area α of both rolls 10, 12, is collected in ink collection boxes 24, 24, and is passed through a second conduit connected to the negative pressure box 38. It is adapted to circulate to reservoir 14 via system 36. In this case, the negative pressure in the negative pressure box 38 is released, and the ink naturally circulates as described above.

If it becomes necessary to change the ink color (color change) due to a change in the printing order, the pump 32 is stopped and the ink supply is interrupted. Next, in the second pipeline system 36 connected to the bottoms of the ink collection boxes 24, 24 disposed at both ends of the rolls 10, 12, respectively, negative pressure is applied to the second pipeline system 36, which is connected to the other end of the pipeline system. A negative pressure is created in the box 38 , whereby the ink in the ink collection box 24 is actively sucked under negative pressure through the second line system 36 and collected into the ink reservoir 14 . Also, during this ink collection, the actuator 52 is activated to cause the third pipe system 4
8 are all brought close to the longitudinal contact area α of both rolls, and the ink remaining in this area α is actively collected into the negative pressure box 38 via the third pipe system 48.

Thereafter, the switching valve 20 of the first pipeline system 28 is switched to the cleaning water supply pipe 66 side, and the cleaning water is supplied to the pipeline system 2.
8 to the ink deposition zones of both rolls 10, 12 to wash away this ink. The washed contaminated water is collected in the ink collection box 24 and then collected in the negative pressure box 38 via the second pipe system 36, and further drained into the external drain pipe 45 under the switching action of the valve 46.
is discharged from. Also, during this ink cleaning, the third
Under the action of the actuator 52, the pipe system 48 continues to have its open end facing the longitudinal contact area α between the two rolls, so that the cleaning water remaining in this area α is actively pumped into the negative pressure box 38. will be collected.

Effects of the Invention As explained above, according to the ink collection and cleaning device for an ink transfer mechanism according to the present invention, in the ink collection box disposed at both ends of both rolls in the ink transfer mechanism and the longitudinal contact area of both rolls, By having the second and third pipeline systems connected to the negative pressure source correspond to each other, when it becomes necessary to change the color of the ink due to a change in the printing order, the ink can be changed easily. Recovery and recovery of the wash water can be carried out actively under the influence of negative pressure. Therefore, cleaning time and ink loss can be reduced. In addition, since the mechanism is simple, it has useful advantages such as fewer failures and lower manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an ink collection and cleaning system of an ink transfer mechanism according to the prior art, and FIG. 2 is an explanatory diagram showing a schematic configuration of a preferred embodiment of an ink collection and cleaning device according to the present invention. 10... Anilox roll, 12... Ink roll, 24... Ink collection box, 28... First pipeline system, 34... Ink transfer mechanism, 36... Second pipeline system, 40... Negative pressure Source, 48...Third pipe system, α
...Longitudinal contact area.

Claims (1)

[Scope of Claims] 1. An anilox roll 10 rotatably provided in a printing press, and an ink roll 12 rotatably disposed in contact with the anilox roll 10 in the longitudinal direction.
and an ink collection box 24 disposed at the ends of both rolls 10 and 12, the anilox roll 10 and the ink roll 1
a first pipe system 28 facing into the longitudinal contact area α with the ink collection box 24 and selectively supplying ink and cleaning water to the area α;
a second pipe system 36 for selectively recovering ink and cleaning water independently from the anilox roll 10 and the ink roll 1;
facing the longitudinal contact area α with the first pipe system 2
a third pipe system 48 that selectively recovers ink and cleaning water independently from the third pipe system 8; the second pipe system 36 and the third pipe system 48 are communicatively connected to a negative pressure source; An ink recovery and cleaning device using an ink transfer mechanism, characterized in that the ink and cleaning water remaining in the longitudinal contact area α of both rolls 10, 12 and the ink recovery box 24 are recovered by negative pressure action.