JPH10296956A - Printing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing unit which facilitates switching of a plurality of color inks in a short time and may have a small installation space. SOLUTION: This printing unit 15 comprises ink supply means 16A, 16B for supplying predetermined color inks for the respective plate cylinders 50 to the plate cylinder 50 to be switched for use in response to desired color. Thus, in the case of operating special color print, presently using means 16A or 16B may be switched to special color ink supply means 16A or 16B, and hence switching operation can be easily executed in a short time. Since the plurality of ink supply means 16A, 16B are contained in one unit, an installation space of the unit 15 may be small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing unit for printing a picture on a web sent from a paper feeding section of a printing press.

[0002]

2. Description of the Related Art As shown in FIG. 4, a general rotary offset printing press 1 has a paper supply unit 2 for supplying a continuous paper (web) W, and a web W from the paper supply unit 2 downstream (see FIG. 4). Sending unit 3 for sending out (middle right direction), blanket cylinder 4 inside
A printing unit 5 including a plurality of printing units 5A to 5D for printing a picture on the web W sent from the sending unit 3 and a drying unit (dryer) 6 for drying ink attached to the printed web W; The apparatus is provided with a cooling unit 7 for cooling the web W sent from the dryer 6 and a folding machine 8 for cutting and folding the web W.

Each printing unit 5A of such a printing press 1
5D are plate cylinders 50 with printing plates as shown in FIG.
The ink 51 is transferred from the plate cylinder 50 and the web W
A printing machine is provided with a blanket cylinder 52 for performing printing on an ink jet printer, an ink supply device 53 for supplying ink 51 to the plate cylinder 50, and a water supply device 65 for supplying water to the plate cylinder 50. In addition, in each of the printing units 5A to 5D, the above-described devices 50, 53, 65, and the like are provided vertically above and below the web W.

The ink supply device 53 includes an ink fountain 54 for storing ink, an ink fountain roller (metal roller) 55 for drawing out ink from the ink fountain 54, and an ink key 56 for adjusting the amount of ink drawn out by the ink fountain roller 55. And an ink transmitting roller group 5 downstream from the ink discharge roller 55 by performing a swinging motion around the point K in the drawing.
7 (rollers 58A to 58C, 59A to 59F), an ink transfer roller (so-called ductor roller) for transferring ink 51
60.

Each of the rollers 58A to 58C is a metal roller that reciprocates in the axial direction.
59F is a rubber roller having a rubber wound on the outer periphery. The ink 51 drawn out by the ink discharge roller 55 is kneaded appropriately while passing through the roller group 57 and is leveled and supplied to the plate cylinder 50. The rollers 59A to 59 are ink mixing rollers,
Rollers 58A to 58C are ink leveling rollers, rollers 59
D to 59F are inking rollers.

Normally, a plurality of ink keys 56 are provided side by side in the direction perpendicular to the paper surface (the axial direction of the ink discharging roller 55), and the thickness of the ink 51 drawn out from the ink fountain 54 is adjusted. The opening degree distribution formed by the gap 61 between the ink key 56 and the ink discharging roller 55 is changed according to the picture.

The water supply device 65 further includes a water boat 66 for storing water, a water discharging roller 68 for drawing water 67 from the water boat 66, a water transfer roller 69, a watering roller 70, and a water rider 71. The roller 69 is a metal roller that reciprocates in the axial direction, and the roller 70 is a rubber roller having rubber wrapped around its outer periphery. And the water supply roller 68
The water 67 extracted by the rollers 69, 7
0, and is supplied to the plate cylinder 50 while being leveled. In FIG. 5, reference numerals of individual rollers of the roller group 57 below the web W are omitted.

In such a printing machine 1, printing is often performed using four colors, for example, black, blue, yellow, and red.
Therefore, four printing units 5A to 5D are often arranged. There are various combinations of color arrangements of the upper plate and the lower plate. For example, when printing two colors of the lower plate with four colors of the upper plate, the third and fourth printing units 5C and 5D are used for the two colors of the lower plate. ing. In the case of four colors of the upper plate and one color of the lower plate,
For the color, the fourth printing unit 5D is used. If the upper plate is two colors and the lower plate is four colors, the upper plate two colors are the third and fourth printing units 5C.
5D is used. This is because sending the printed matter to the dryer 7 immediately requires less contamination of the web W.

For this reason, if it is necessary to print a color different from the conventional four colors, that is, a special color, for example, if only one lower plate is a special color, the color is changed by the fourth printing unit 5D.
If the two lower colors are spot colors, the third and fourth printing units 5C, 5C
D is changing colors.

[0010]

However, in the conventional printing units 5A to 5D, when it becomes necessary to print a special color other than the four colors, the third and fourth printing units 5C and 5D are required.
In many cases, the color is changed by using the ink 51 in the ink fountain 54. In this case, the ink 51 in the ink fountain 54 is scraped out to clean the inside of the fountain, and thereafter, a special color ink is applied to the ink fountain 51.
The work has to be troublesome and takes a lot of time because it must be satisfied within.

[0011] In view of the above, if there are relatively many requests for printing a special color, it is conceivable to install printing units for, for example, five or six colors from the beginning, but such a structure increases the number of printing units. Therefore, there is a problem that the space of the printing unit becomes large, and as a result, the space of the entire printing press also becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing unit which can easily switch between a plurality of colors of ink in a short time and requires a small installation space.

[0013]

According to a first aspect of the present invention, there is provided a printing unit including a plate cylinder for printing a pattern on a web sent from a paper feeding unit of a printing press, wherein the plate cylinder is provided. Has a plurality of ink supply means for supplying ink of a predetermined color to the plate cylinder for one of these, and these ink supply means can be switched and used according to a desired color. It is a feature.

In the above description, when a plurality of printing units constituting the printing unit are installed, it is preferable that one printing unit of the present invention is installed near the dryer, but two or more printing units may be installed. Further, the ink supply means may be provided on each of the plate cylinder for the upper plate and the plate cylinder for the lower plate, or may be provided on either one of them. further,
The ink supply means includes one provided with a portion shared until reaching the plate cylinder.

In the present invention, a plurality of ink supply means are provided so as to be selectively used for one plate cylinder. Therefore, when printing a special color, the ink supply means which is currently used is used for the special color. It is sufficient to switch to the ink supply means of
The switching operation can be easily performed in a short time. Also, since a plurality of ink supply means are accommodated in one unit, there is no need to provide a unit dedicated to a special color, thereby reducing the installation space of the printing unit.

The printing unit according to the second aspect of the present invention comprises:
The invention is characterized in that each ink supply means is provided with an ink fountain roller having an ink fountain for storing ink of a predetermined color, and an ink transfer roller for transferring ink from the ink fountain roller to the plate cylinder side. Is what you do.
In the present invention, when the color is switched, only the roller group of a portion from the ink discharge roller and the ink transfer roller to the plate cylinder may be washed, and each time the ink bottle and the like are not washed. As a result, the switching operation can be easily performed in a short time.

[0017] The printing unit according to the third aspect of the present invention comprises:
Each of the ink supply means in the invention is provided with an ink fountain roller having an ink fountain for storing ink of a predetermined color, an ink transfer roller for transferring the ink from the ink fountain roller to the plate cylinder side, an ink transfer roller, An ink transfer roller group including an ink kneading roller, an ink leveling roller, and an ink setting roller, which is disposed between the plate cylinder and the ink transfer roller and transmits ink from the ink transfer roller to the plate cylinder side. It is characterized by the following. In the present invention, when the color is switched, it is only necessary to switch for each ink supply unit, so that the cleaning of the roller group is not required, and the switching operation can be further easily performed in a short time.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
The printing unit 15 of the embodiment is arranged at the final position (on the dryer side) of the plurality of printing units 5A to 5D of the printing unit 5 in the printing press 1, that is, at the position of the printing unit 5D. In the present embodiment, the same structure as the conventional printing units 5A to 5D,
The same reference numerals are given to the used members and the like, and detailed description thereof is omitted or simplified.

In the printing unit 15 of the present embodiment, first and second ink supply means 16A and 16B are provided for the upper and lower plate cylinders 50 disposed on the upper plate and the lower plate, respectively. These ink supply means 16A,
16B are disposed above the plate cylinder 50 and substantially symmetrically to the left and right with respect to the axis, facing each other. here,
The ink transfer roller 60 of each of the ink supply means 16A and 16B swings around the point K as described above,
Rollers of the ink transfer roller group 57 (ink mixing rollers)
59A can be brought into close contact with and detached therefrom.

Next, the operation of the present embodiment will be described with reference to FIG. In the present embodiment, the first ink supply unit 16
A will be described assuming that A is used for blue and the second ink supply means 16B is used for red, and the color is changed between blue and red. As shown in FIG. 2A, for printing in blue, a first ink supply means 16A in which an ink fountain 54 is filled with blue ink 51A is used, and the ink of the first ink supply means 16A is used. The ink 51 </ b> A pulled out from the discharge roller 55 is transferred from the ink transfer roller 60 through the ink transmission roller group 57 and the plate cylinder 50 to the blanket cylinder 4.
And printing with the blue ink 51A is performed.

At this time, the ink fountain 54 of the second ink supply means 16B is filled with the red ink 51B in advance, and the ink transfer roller 60 for the second ink supply means 16B swings. And second ink supply means 16B
Side, that is, separated from the ink transmission roller group 57, and fixed in that state. Therefore, the second
The red ink 11B on the side of the ink supply means 16B is the first
Does not adhere to the ink supply means 16A, the ink transmission roller group 57, and the like.

Next, as shown in FIG. 2B, the ink transfer roller 60 of the first ink supply means 16A is swung to be positioned and fixed to the first ink supply means 16A side, and the second ink supply means is fixed to the second ink supply means 16A. The ink transfer roller 60 for the ink supply means 16B is still positioned on the second ink supply means 16B side, that is, separated from the ink transmission roller group 57 and fixed in that state. Then, the rollers 58A to 58C and 59A to 59F of the ink transfer roller group 57, the plate cylinder 50, and the blanket cylinder 52 are cleaned.

Each roller 58A-58C, 59A-59F
After the completion of the cleaning, the second ink supply means 16B is operated as shown in FIG.
0, the ink fountain 54 of the second ink supply means 16B is rotated.
From the ink transmission roller group 57 to transmit the ink 51B to the plate cylinder 50 and the like,
Print in red. At this time, the first ink supply means 1
The 6A ink transfer roller 60 is connected to the first ink supply unit 1.
6A, that is, separated from the ink transmission roller group 57, and fixed in that state. Thereafter, the same operation is repeated.

According to this embodiment, the following effects can be obtained. The first ink supply means 16 for one plate cylinder 50
A, the second ink supply means 16B is provided, and these can be switched by swinging the ink transfer roller 60 of the respective ink supply means 16A, 16B. For example, after the first ink supply means 16A is separated from the transmission roller group 57 and the transmission roller group 57 is cleaned,
The ink supply means 16B of the ink supply means 16A can be switched to another ink supply means without scraping out the ink in the ink fountain 54 of the ink supply means 16A and subsequent washing, and the switching operation can be easily performed in a short time. Since the first and second ink supply means 16A and 16B are housed in one unit, there is no need to separately provide a printing unit dedicated to a special color, thereby reducing the installation space. Although the first ink supply means 16A and the second ink supply means 16B are arranged independently, they are easy to manufacture because they have the same structure.

FIG. 3 shows a second embodiment of the present invention. The printing unit 15 'of this embodiment has the ink supply means 16A, 16B of the first embodiment inside.
A first ink supply unit 26A and a second ink supply unit 26B having different configurations from those of the first embodiment are provided.

That is, each of the ink supply means 26A, 26
B is the ink supply means 16A, 16A of the first embodiment.
B includes the ink transfer roller group 57 and the water supply device 65 respectively. More specifically, each of the ink supply means 26A and 26B is provided with an ink fountain roller 55 having an ink fountain 54 for storing ink of a predetermined color, and ink from the ink fountain roller 55 to the plate cylinder 5.
An ink transfer roller 60 for transferring the ink from the ink transfer roller 60 to the plate cylinder 50; and an ink mixing roller 59A-59C for transferring the ink from the ink transfer roller 60 to the plate cylinder 50; Rollers 58A to 58C
And the ink transmission roller group 57 including the ink application rollers 59D to 59E.

These ink supply means 26A, 26B
Can be separated from the surface of the plate cylinder 50 by the drive means 28. For example, when one ink supply means 26A is used, the other ink supply means 26B Away from surface. As a result, switching use is performed.

In this embodiment, for example, when printing is performed by the second ink supply means 26B instead of printing by the first ink supply means 26A, the first ink supply means 26A is driven by the driving means 28 to form a plate. After separating from the surface of the cylinder 50, the second ink supply means 26B is continuously operated to bring the ink forming rollers 59D to 59E into contact with the plate cylinder 50, and printing is performed by the ink supply means 26B.

The printing unit 1 according to the present embodiment as described above
In 5 ', the same effect as described above can be obtained, and at the time of color change, only the switching between the first ink supply means 26A and the second ink supply means 26B is required. Since there is no need to perform the switching, the switching time can be further shortened.

The present invention is not limited to the above embodiments, but includes the following modifications as long as the objects of the present invention can be achieved. That is,
In the first embodiment, the first and second ink supply units 16A and 16B are switched between the upper and lower plates. However, the present invention is not limited to this, and only the upper plate or the lower plate may be changed in color. Even in this case, the same effects as those described above can be obtained.

[0031]

As described above, according to the printing unit of the present invention, a plurality of ink supply means are provided so as to be switchable for one plate cylinder. What is necessary is just to switch the ink supply unit currently used to the ink supply unit for the special color, and the switching operation can be easily performed in a short time. In addition, since a plurality of ink supply units are accommodated in one unit, it is not necessary to separately provide a unit dedicated to a special color, thereby reducing the installation space of the printing unit.

[Brief description of the drawings]

FIG. 1 is an overall view showing a printing unit according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a use state of the printing unit according to the embodiment.

FIG. 3 is a partial view showing a printing unit according to a second embodiment of the present invention.

FIG. 4 is an overall view showing a conventional general printing press.

FIG. 5 is an overall view showing a conventional printing unit.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 printing machine 5A to 5D printing unit 15, 15 'printing unit 16A, 26A first ink supply means 16B, 26B second ink supply means 50 plate cylinder 51 ink 53 ink supply means 54 ink fountain 55 ink delivery roller 57 ink transmission roller 65 Water supply device W Web (continuous paper)

Claims (3)

[Claims] 1. A printing unit comprising a plate cylinder for printing a picture on a web sent from a paper feeding unit of a printing press, wherein each of said plate cylinders is provided with ink of a predetermined color. A printing unit, comprising: a plurality of ink supply means for supplying to a plate cylinder; these ink supply means can be switched and used according to a desired color. 2. The printing unit according to claim 1, wherein each of said ink supply means has an ink fountain roller having an ink fountain for storing ink of a predetermined color, and said plate cylinder receives said ink from said ink fountain roller. A printing unit, comprising: an ink transfer roller for transferring to the side. 3. The printing unit according to claim 1, wherein each of said ink supply means includes an ink fountain roller having an ink fountain for storing ink of a predetermined color, and said plate cylinder receives said ink from said ink fountain roller. An ink transfer roller, an ink kneading roller, an ink leveling roller, and an ink setting roller that are disposed between the ink transfer roller and the plate cylinder and that transmit ink from the ink transfer roller to the plate cylinder side. A printing unit comprising: a group of ink transfer rollers including: