JP2003266649A - Impression cylinder jacket cleaning device for sheet-feed offset perfecting press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost impression cylinder jacket cleaning device which can be applied irrespective of a type of an impression throw-in mechanism without fluff of a nonwoven fabric without bringing about a wear or a drop of a mold release agent by cleaning with high cleaning effect by a simple mechanism at a low initial running cost. <P>SOLUTION: The impression cylinder jacket cleaning device for the sheet-feed offset perfecting press comprises a metal plate, a base layer formed on the plate and having ruggedness on a surface, an impression cylinder 23 mounted with a jacket having a low surface energy resin layer formed on the base layer, a cleaning unit 31 brought into contact with or separate from a blanket cylinder 22 opposite to the impression cylinder, a water supply unit 50 for supplying water to the cylinder 21 opposite to the blanket cylinder, and a controller brought into contact with the plate cylinder, the blanket cylinder to supply water to the plate cylinder to rotate to bring the cylinders into contact into the cleaning unit in a state in which the cleaning unit is brought into contact with the blanket cylinder for a predetermined time to control the cylinders. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved impression cylinder jacket cleaning device in a sheet-fed offset double-sided printing machine.

[0002]

2. Description of the Related Art A sheet-fed offset double-sided multi-color printing machine is a system in which a plurality of printing units provided on one side (for example, an upper side) of a paper conveyance path are used to reverse the front and back of the paper during printing. There is a method of alternately printing the front side and the back side of the paper by a plurality of printing units provided on the upper and lower sides of the paper conveyance path.

Whichever type of printing machine is used, before the ink on one of the printed papers dries, the paper is transferred between the blanket cylinder and the impression cylinder with the printing surface in contact with the impression cylinder. The other paper surface is printed by being pressed. Therefore, the ink already printed on the one surface of the paper adheres to the impression cylinder. The ink adhering to the impression cylinder is reversely transferred to the paper fed next, so that the printed matter becomes dirty, and in this state, multicolor double-sided printing cannot be realized.

In order to solve this problem, Japanese Patent Laid-Open No. 8-12
The technique described in Japanese Patent No. 151 has been proposed. In the technique described in the above publication, a surface roughness Rmax of 20 to 20 formed by spraying porous ceramics on a metal plate and coating a low surface energy resin (release agent) such as a silicone resin on the porous ceramics is applied. By attaching a jacket having smooth irregularities of 40 μm to the impression cylinder, ink on the paper surface immediately after printing is prevented from adhering to the jacket attached to the impression cylinder. This technology has made it possible to use double-sided multicolor printing even for paper that is difficult to absorb ink, such as art paper and coated paper.

However, even when this jacket is used, when the new jacket is used, it is referred to as a "convex portion" (hereinafter referred to as "ceramic convex portion") of the ceramic sprayed layer on the surface of the jacket about once per 60,000 sheets printed. If the release agent of 1) is worn out, it is necessary to wash the jacket once for printing 10,000 sheets.

When the jacket is washed by hand, it is forced to work in an unstable posture in a very narrow place, and there is a problem in terms of safety and work efficiency. Therefore, in order to solve the problem of washing the jacket by hand wiping, various automatic impression cylinder jacket washing devices are used.

Various types of conventional pressure cylinder jacket automatic cleaning devices and their problems will be described below.

(1) First type cleaning device for directly pressing a non-woven fabric impregnated with a cleaning liquid onto an impression cylinder FIG. 7 is a view showing a conventional first type impression cylinder jacket cleaning device. In the apparatus shown in FIG. 7, while the plate cylinder 121, the blanket cylinder 122, and the impression cylinder 123 are not in contact with each other, the non-woven fabric 131b impregnated with the cleaning liquid is rotated while the machine (each cylinder 121 to 123) is rotated at a low speed. Is directly pressed against the impression cylinder 123 equipped with the jacket. As a result, the ink attached to the jacket is softened, and the softened ink is wiped off by the nonwoven fabric. Further, the cleaning of the blanket cylinder 122 is also performed by directly pressing the non-woven fabric 131a against the blanket cylinder 122. In this type of cleaning device, there are a method of spraying a cleaning liquid on a dry nonwoven fabric from a nozzle during a cleaning operation, and a method of using a nonwoven fabric impregnated with the cleaning liquid in advance.

However, in the cleaning device of the first type, since the surface of the impression cylinder jacket is strongly rubbed with the rough non-woven fabric, not only the mold releasing agent for the ceramic convex portion on the jacket surface but also the concave portion is separated. There is a problem that the mold may be worn away. In the jacket attached to the impression cylinder, the release agent is the key to prevent ink adhesion. Therefore, if the release agent is worn away, the jacket is very likely to be contaminated, and as a result, the printed matter is contaminated. Therefore, the jacket must be replaced. In case of washing the jacket by hand-wiping, the replacement life of the jacket is about once every 20 million to 30 million sheets of paper threaded, but when using the first type washing device that directly presses the non-woven fabric onto the impression cylinder, The service life is about once every 15 million sheets of paper, which is about half that in the case of hand-washing.

When the non-woven fabric is pressed against the impression cylinder and the impression cylinder is rotated, the fluff of the non-woven fabric is entangled with the ceramic projections on the surface of the jacket mounted on the impression cylinder and remains on the jacket even after the cleaning operation. There is a risk. This fluff
At the time of the next printing, there is also a problem that it appears as white spots on the printed surface, resulting in defective printing.

Further, in the first type cleaning device, the cleaning mechanism section having a complicated structure having the non-woven fabric must be provided in two very narrow places near the blanket cylinder 122 and the impression cylinder 123. Expensive capital investment is required. Moreover, since the non-woven fabric needs to be replaced frequently, the running cost is very high.

(2) Second type cleaning device in which a brush roller to which a cleaning liquid is supplied is pressed against an impression cylinder to rotate it FIG. 8 is a view showing a conventional second type impression cylinder jacket cleaning device. . In the apparatus shown in FIG. 8, a brush roller to which the cleaning liquid is supplied while the printing machine 121, the blanket cylinder 122, and the impression cylinder 123 are in non-contact with each other while rotating this machine (each cylinder 121 to 123) at a low speed. 141b
It is directly pressed against the impression cylinder 123 equipped with a jacket. This allows the ink adhering to the jacket to be washed off. The two nozzles 142b, 1
Different kinds of cleaning liquids are supplied using 43b. The blanket cylinder 122 is also cleaned by the two nozzles 14
The same operation is performed by directly pressing the brush roller 141a, to which different types of cleaning liquids are supplied by using 2a and 143a, to the blanket cylinder 122. As a method of treating the supplied cleaning liquid, there are a method of circulating and recycling and a method of disposing as a waste liquid.

However, this second type cleaning device also has the same structure as the above-mentioned first type cleaning device.
Since the brush is directly pressed against the jacket surface to rotate in contact therewith, not only the mold releasing agent on the ceramic convex portion on the jacket surface but also the mold releasing agent on the concave portion is likely to be worn, and the jacket life may be significantly shortened.

Further, as in the case of the above-mentioned first type cleaning device, a cleaning mechanism section having a complicated structure having a brush roller is provided in two very narrow places near the blanket cylinder 122 and the impression cylinder 123. Therefore, expensive capital investment is required. In addition, the facility cost of the cleaning liquid circulation / recycling device is also high, and waste liquid treatment is large-scale when the cleaning liquid is not recycled. (3) A cleansing body that can contact and separate from a blanket cylinder facing the impression cylinder is provided, and the blanket cylinder is rotated in contact with the impression cylinder for a certain period of time in a state where the cleansing body is pressed against the blanket cylinder. FIG. 9 is a diagram showing a third type of conventional impression cylinder jacket cleaning device. This third type of cleaning device is disclosed in the above-mentioned publication (JP-A-8-12151), and is a cleaning device for cleaning a jacket on which a composite coating film of a ceramic sprayed layer and a release agent layer is formed. Is.

In the apparatus shown in FIG. 9, only the plate cylinder 121 is in non-contact with the other cylinders, and the blanket cylinder 122 and the impression cylinder 123 are in contact with each other, and the machine (each cylinder 121 to 123) is rotated at a low speed. The nonwoven fabric 131 impregnated with the cleaning liquid
a is pressed against the blanket cylinder 122. Therefore, the ink on the jacket attached to the impression cylinder 123 is softened by a slight cleaning liquid from the blanket cylinder 122 due to the contact rotation of the blanket cylinder 122 and the impression cylinder 123, and moreover, the mold release agent is present on the surface of the jacket. Being coated, it is very easily transferred back to the blanket cylinder. As described above, only the cleaning mechanism section having the non-woven fabric 131a attached to the blanket cylinder 122 is used.
The jacket attached to 3 is also washed cleanly.

Further, the blanket cylinder 122 and the impression cylinder 123
Is pressed with a strong pressure, but no slip occurs between the two, so that the release agent is not worn on the surface of the jacket mounted on the impression cylinder. Of course, since the non-woven fabric is not brought into direct contact with the jacket, there is no problem of leaving the non-woven fabric fluff on the jacket, which is a very excellent cleaning device.

In the third type of cleaning device, the blanket cylinder 122 is first used as a mechanism for bringing the plate cylinder 121 and the blanket cylinder 122 into contact with each other and the blanket cylinder 122 and the impression cylinder 123 during printing (cylinder inserting mechanism of the printing machine). In the case where the method of hitting the impression cylinder 123 and then the plate cylinder 121 is adopted, and the blanket cylinder 122 can be stopped at the position where it hits the impression cylinder 123, addition of an electrical sequence is performed with almost no facility modification. Because it can be done only by
Very low cost equipment investment.

However, as the cylinder insertion mechanism of the printing machine, a system in which the blanket cylinder 122 first hits the plate cylinder 121 and then contacts the impression cylinder 123 is mainly used at present. When the blanket cylinder 122 and the impression cylinder 123 are brought into contact with each other by such a cylinder inserting mechanism to clean the blanket cylinder 122, the jacket mounted on the impression cylinder 123 is of course cleaned, but the cleaning liquid is applied to the plate through the blanket cylinder 122. It also transfers to the body 121. If the cleaning liquid adheres to the plate cylinder 121, the printing plate wound around the plate cylinder 121 becomes sensitized, and when the next printing is performed, background stains occur on the printed matter, resulting in defective printing. Therefore, this third
This type of cleaning device has a problem in that it cannot be adopted in the current mainstream printing machines.

On the other hand, if the third type of cleaning device is adopted as it is in a mainstream printing machine, the blanket cylinder 122 is brought into contact with only the impression cylinder 123 in order to prevent the transfer of the cleaning liquid to the plate cylinder 121. It is necessary to change to a mechanism that rotates. In this case, a large-scale design change of the mechanism is required, and the equipment cost for the change becomes large.

[0020]

SUMMARY OF THE INVENTION The present invention has been made to solve various problems in the above-mentioned conventional impression cylinder jacket cleaning apparatus. We provide an impression cylinder jacket cleaning device that does not cause wear and drop of the mold agent, does not leave fluff on the non-woven fabric, can be applied regardless of the method of the cylinder insertion mechanism, and has a simple mechanism with extremely low initial cost and running cost. That is.

[0021]

The objects of the present invention are achieved by the following means.

(1) A flexible metal plate,
In a sheet-fed offset double-sided printing machine provided with an impression cylinder equipped with a jacket having a base layer formed on the metal plate and having surface irregularities, and a low surface energy resin layer formed on the base layer An impression cylinder jacket cleaning device comprising: a cleaning body capable of contacting and separating from a blanket cylinder facing the pressure cylinder; a water supply unit capable of supplying water to a plate cylinder facing the blanket cylinder; Water is supplied to the plate cylinder, the plate cylinder and the blanket cylinder, and the blanket cylinder and the impression cylinder are in contact with each other, and the cleaning body is in contact with the blanket cylinder for a predetermined time. And a control means for rotating each cylinder in contact with each other.

As described above, the conventional third type of cleaning device is an extremely excellent impression cylinder jacket cleaning device, but the biggest problem is that the blanket cylinder hits the plate cylinder first as the cylinder insertion mechanism. In a printing machine that uses the method of hitting the impression cylinder, the surface of the plate cylinder (plate surface) becomes sensitized during cleaning of the blanket cylinder and the impression cylinder, which means that the printing plate cannot be used.

In order to solve this problem, each cylinder is rotated at a low speed, and water is supplied to the plate surface by the water supply means before the cylinder is inserted. Then, the blanket cylinder is put in the cylinder, and the blanket cylinder and the plate cylinder, and the blanket cylinder and the impression cylinder are brought into contact with each other.
Next, the blanket cylinder and the impression cylinder are simultaneously cleaned by rotating the plate cylinder, the blanket cylinder, and the impression cylinder in contact with each other for a certain time while the cleaning body is pressed against the blanket cylinder.

Here, the water supply means is always provided in the offset printing machine, and it is only necessary to use it, and it is not necessary to newly install it.

When water is supplied to the plate surface, since the non-image area of the plate is very hydrophilic, even if the cleaning liquid from the cleaning body comes into contact with the plate surface through the blanket cylinder after the blanket cylinder is put in the cylinder. The cleaning liquid floats on the water and does not make the printing plate oily.

Further, most of the sheet-fed offset double-sided multicolor printing machines are equipped with a blanket cleaning mechanism section having a cleaning body capable of contacting and separating from the blanket cylinder as standard equipment.
Therefore, by adopting the cleaning method according to the present invention, it is possible to improve a slight electric sequence in a general printing machine by using only the cleaning mechanism part for the blanket cylinder without the cleaning mechanism part for the impression cylinder. Thus, the blanket cylinder, the impression cylinder, and the plate cylinder can be simultaneously cleaned.

Further, if the cleaning method according to the present invention is adopted, water from the plate surface is also supplied to the impression cylinder, so that it is possible to easily remove the paper dust as well as the ink on the jacket mounted on the impression cylinder. There is an advantage that becomes possible. That is, normally, the cleaning liquid used in the cleaning mechanism part of the blanket cylinder is a petroleum solvent, and such cleaning liquid dissolves the ink on the blanket cylinder and the jacket attached to the impression cylinder, but it adheres to the jacket. This is because paper dust (coating material such as calcium carbonate coated on paper) does not dissolve in oil, and therefore the wash dust cannot easily remove the paper dust.

(2) The pressure drum jacket cleaning device according to (1), wherein the cleaning body is a non-woven fabric impregnated with a cleaning liquid before the cleaning operation.

(3) The pressure drum jacket cleaning device according to (1), wherein the cleaning body is a non-woven fabric to which a cleaning liquid is supplied and impregnated during a cleaning operation.

(4) The cleaning body is a brush to which a cleaning liquid is supplied at the time of cleaning work.
The impression cylinder jacket cleaning device according to.

(5) The water supply means comes into contact with the plate cylinder.
Any of the above (1) to (4), characterized in that it has a water supply roller that can be separated, and the control means performs control to bring the water supply roller into contact with the plate cylinder when water is supplied to the plate cylinder. The impression cylinder jacket cleaning device according to any one of the above.

(6) The control means moves the blanket cylinder so that the blanket cylinder and the impression cylinder are brought into contact with each other simultaneously with or after the plate cylinder and the blanket cylinder are brought into contact with each other. The pressure drum jacket cleaning device according to any one of (1) to (5) above.

(7) The pressure drum jacket cleaning device according to any one of the above (1) to (6), wherein the base layer is a metal sprayed layer formed by spraying a metal. .

(8) The base layer is composed of a metal sprayed layer formed by spraying a metal, and a porous ceramic sprayed layer formed by spraying ceramics on the metal sprayed layer. The impression cylinder jacket cleaning device according to any one of (1) to (6) above.

(9) The low surface energy resin is a silicone-based resin, and the above (1) to
The pressure drum jacket cleaning device according to any one of (8).

(10) A jacket having a flexible metal plate, a base layer formed on the metal plate and having surface irregularities, and a low surface energy resin layer formed on the base layer. A method for cleaning an impression cylinder jacket in a sheet-fed offset double-sided printing machine equipped with an impression cylinder, comprising rotating the impression cylinder, a blanket cylinder facing the impression cylinder, and a plate cylinder facing the blanket cylinder. A step of supplying water to the plate cylinder; a step of bringing the plate cylinder and the blanket cylinder into contact with each other; and a step of bringing the blanket cylinder and the impression cylinder into contact with each other; ,
And a step of bringing the blanket cylinder into contact with the blanket cylinder.

(11) The step of bringing the plate cylinder and the blanket cylinder into contact with each other may be performed simultaneously with or after the step of bringing the plate cylinder and the blanket cylinder into contact with each other. The method for washing an impression cylinder jacket according to (10) above.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the construction of a sheet-fed offset double-sided printing machine to which an impression cylinder jacket cleaning apparatus according to an embodiment of the present invention is applied.

The sheet-fed offset double-sided printing machine shown in FIG. 1 conveys a sheet P (hereinafter, simply referred to as "paper") to be conveyed.
A printing unit 10 for performing predetermined printing, a paper feeding unit 70 for separating the stacked paper sheets P one by one and sending them to the printing unit 10, and a printed paper sheet conveyed from the printing unit 10. It has a paper discharge section 80 for stacking P.

The printing unit 10 includes a plurality of printing units 11 to 11.
It is composed of 18. The printing units 11 to 14 are the paper P.
Is provided on the upper side of the transport path of the paper P, and the upper surface of the paper P can be printed, while the printing units 15 to 18 are provided on the lower side of the transport path of the paper P, and the lower surface of the paper P is Can be printed. Also, the printing units 11 and 1
5 uses black (B) ink, printing units 12 and 16 use indigo (C) ink, printing units 13 and 17 use red (M) ink, and printing units 14 and 18 use yellow (Y) ink. Is. Thus, FIG.
This printing machine constitutes a sheet-fed offset double-sided 4 / 4-color printing machine that employs a method of printing the front side and the back side alternately without reversing the paper.

FIG. 2 is a diagram showing an example of the configuration of the printing unit 11. Hereinafter, the printing unit 11 will be described. The other printing units 12 to 18 are the same as the printing unit 11.
Since the configuration is the same as, the description will be omitted.

As shown in FIG. 2, the printing unit 11 includes
A plate cylinder 21 around which a printing plate (not shown) is wound, a blanket cylinder 22 for transferring a pattern from the printing plate wound around the plate cylinder 21 to the surface, and a blanket cylinder 22 that holds paper with a nail (not shown). And an impression cylinder 23 for pressing.
A rubber layer is formed on the surface of the blanket cylinder 22 to generate an appropriate printing pressure. As shown, the blanket cylinder 22 is arranged opposite the impression cylinder 23, and the plate cylinder 21 is arranged opposite the blanket cylinder 22. The papers are conveyed one by one from the right side in the drawing, held by the claws of the impression cylinder 23, and pressed by the blanket cylinder 22 to be printed.

FIG. 3 is a diagram showing an example of the structure of the impression cylinder 23. As shown in FIG. 3, the impression cylinder 23 includes an impression cylinder body 24.
And a jacket 25 wound around the impression cylinder body 24.

FIG. 4 is a partially enlarged sectional view schematically showing an example of the construction of the jacket 25, and FIG. 5 is a sectional view further enlarging a part of FIG. As shown in FIG. 4, the jacket 25 includes a flexible metal plate 26, a base layer 27 formed on the metal plate 26 and having irregularities on the surface, and a low surface formed on the base layer 27. And an energy resin layer 28. The base layer 27 includes a hard metal sprayed layer 27a formed by spraying a metal, and a porous ceramic sprayed layer 27b formed by spraying ceramics on the metal sprayed layer 27a. However, the base layer 27 is not limited to the above structure, and may be composed of only the metal sprayed layer 27a, for example.

In the case of manufacturing the jacket 25, first, a metal sprayed layer 27a such as Ni-Cr is formed on the surface of a metal plate 26 such as a stainless steel (SUS) plate that is roughened by degreasing and blasting. Then, the ceramic sprayed layer 27b is formed thereon. The formation of the ceramic thermal sprayed layer 27b, for example a ceramic material such as gray alumina (G-Al ₂ O ₃₎ is used. Ceramic sprayed layer 27 thus formed
As shown in the figure, the surface of b is formed by a combination of short-period irregularities (pitch-wave irregularities) that form very sharp protrusions and longer periodic irregularities (waviness irregularities). Surface, typically, Rmax 30-50 μm
It is a rough surface. Also, the ceramic sprayed layer 27b
Has fine pores, preferably 0.1 μm to several tens of μm, with a porosity of 5 to 20%. A low surface energy resin (release agent) such as a silicone resin is impregnated and coated on the ceramic sprayed layer 27b and dried and solidified. As a result, as shown in FIGS. 4 and 5, the low surface energy resin layer 28 is formed on the surface of the ceramic sprayed layer 27b and in the holes.

The low surface energy resin layer 28 substantially entirely covers the surface of the ceramic sprayed layer 27b,
The wavy corrugated concave portion is thick, while the wavy corrugated convex portion is thinly attached. Therefore, the surface texture is smoother than that in the case where only the ceramic sprayed layer 27b is formed. However, the irregularities due to the ceramic sprayed layer 27b are not completely buried, and the wavy irregularities are generally maintained, and a rough surface having smooth irregularities can be formed. The final surface roughness Rmax is typically 20.
It is desirable to set the thickness to about 40 μm. Further, it is desirable that the final convex portions in the smooth unevenness (the convex portions of the waviness) are uniformly dispersed at a rate of about 1 per 30 μm × 30 μm square to 60 μm × 60 μm square. The convex portion referred to here is measured by two-dimensionally scanning the surface of the object to be measured over a length of 20 mm and a width of 20 mm, and a height of 70% or more of the height of the highest convex portion in this measurement region is measured. It refers to the convex portion that it has.

Jacket 25 manufactured in this way
When the impression cylinder 23 mounted with is in contact with the paper as the printing medium, it does not contact the entire surface of the jacket 25, but only the smooth protrusions as described above.
Moreover, since the low surface energy resin layer 28 exists on the surface of the resin, the transfer of the ink from the paper hardly occurs.

As shown in FIG. 2, the impression cylinder jacket cleaning device applied to the printing machine of FIG.
Cleaning unit 30 having a non-woven fabric 31 as a cleaning body capable of coming into contact with and separating from the water, and a water supply unit 5 capable of supplying water to the plate cylinder 21.
It has 0 and.

The cleaning mechanism section 30 has a winding shaft 32 for winding the nonwoven fabric 31. The nonwoven fabric 31 is wound around the winding shaft 32 at a pitch of several seconds so that a clean surface is always exposed to the blanket cylinder 22. The used non-woven fabric 31 is replaced with a new one. The non-woven fabric 31 may be a non-woven fabric which is preliminarily impregnated with the cleaning liquid before the cleaning work, or may be a non-woven fabric which is supplied with the cleaning liquid and impregnated during the cleaning work. Further, the cleaning mechanism portion of the present invention is not limited to the one using a nonwoven fabric, and for example, a cleaning mechanism portion having a brush to which a cleaning liquid is supplied at the time of cleaning work can be adopted.

The water supply section 50 has a water supply roller 51 that can be brought into contact with and separated from the plate cylinder 21, and a water tank 52 for containing water sent to the water supply roller 51. The water supply unit 50 shown in FIG. 2 is an example, and the water supply unit of the present invention is not limited to this, and various water supply systems can be applied.

These cleaning mechanism section 30 and water supply section 50
Is, as described above, provided in a general sheet-fed offset double-sided multicolor printing machine.

The reference numeral 60 in the figure makes contact with the plate cylinder 21.
3 shows an inking section having a plurality of inking rollers 61 that can be separated. The inking roller 61 is brought into contact with the plate cylinder 21 around which the printing plate is wound during printing.

In this embodiment, in particular, water is supplied to the plate cylinder 21 by the water supply unit 50, and the plate cylinder 21 and the blanket cylinder 22,
While the blanket cylinder 22 and the impression cylinder 23 are in contact with each other, and the nonwoven fabric 31 of the cleaning mechanism section 30 is in contact with the blanket cylinder 22, each cylinder 2 is held for a certain period of time.
It has a control unit (not shown) capable of executing an electric sequence for rotating the contact holes 1 to 23.

Next, referring to the flowchart of FIG.
The operation of the impression cylinder jacket cleaning apparatus of this embodiment will be described.

The impression cylinder jacket cleaning process is performed after the printing operation is completed and the printing machine is once stopped. At this time, the plate cylinder 21 (press plate) and the blanket cylinder 2
2, and the surface of the impression cylinder 23 (jacket 25) has ink associated with the pattern of the previous printing.

A switch (not shown) is used to switch to the blanket cylinder and impression cylinder cleaning modes (S1).
0). First, the machine (plate cylinder 21, blanket cylinder 22, and impression cylinder 23) is rotated at a predetermined low speed (S20),
The water supply unit 50 is turned on to supply water to the plate cylinder 21 (S30). Here, the water supply roller 51 of the water supply unit 50 is
It is rotated at a predetermined speed (water volume) and pressed against the plate cylinder 21. As a result, a water film is formed on the surface (plate surface) of the printing plate wound around the plate cylinder. The amount of water supplied to the plate surface is automatically set to an optimum value by the number of rotations of the water supply roller 51 in the water supply means so as not to wet the claw portion of the paper holder by too much water.

Next, the body is inserted (S40). That is, after the plate cylinder 21 is rotated a predetermined number of times, the blanket cylinder 22 is rotated by the plate cylinder 21 while the machine is rotating at a low speed.
And is pressed against the impression cylinder 23. Here, the pressing force between the blanket cylinder 22 and the impression cylinder 23 is set to a printing pressure preset value of, for example, 0.05 to 0.10 mm, but it can be appropriately adjusted. Then, the cleaning mechanism unit 30 is turned on (S50). That is, the non-woven fabric 31 impregnated with the cleaning liquid in the cleaning mechanism unit 30 is the blanket cylinder 22.
Pressed against the surface of.

This state is held for a predetermined time (for example, several minutes). As a result, the ink on the jacket 25 attached to the impression cylinder 23 is softened by the cleaning liquid from the blanket cylinder 22 due to the contact rotation of the blanket cylinder 22 and the impression cylinder 23, and is easily transferred to the blanket cylinder 22 in reverse. It is cleaned thoroughly with the ink on the blanket cylinder 22.
Here, since no slip occurs between the blanket cylinder and the impression cylinder, wear of the release agent on the surface of the jacket mounted on the impression cylinder does not occur. In addition, since the non-woven fabric is not brought into direct contact with the jacket 25, the fluff of the non-woven fabric does not remain on the jacket 25, and it is possible to prevent the occurrence of blank defects in the next printing.

Further, as a cylinder insertion mechanism of the printing machine, the blanket cylinder 22 first contacts the plate cylinder 21 and then the impression cylinder 2
Even when the method of 3 is adopted, the cleaning liquid comes into contact with the plate surface through the blanket cylinder, but by supplying water to the plate surface, the cleaning liquid floats on the water and does not desensitize the plate surface. In addition, since water from the plate surface is also supplied to the impression cylinder 23 via the blanket cylinder, there is an advantage that it is possible to easily remove not only the ink on the jacket 25 but also the paper powder that is insoluble in the cleaning agent.

Here, the blanket cylinder, the impression cylinder, the impression cylinder, and the impression cylinder are improved by slightly improving the electric sequence in a general printing machine without using the cleaning mechanism of the impression cylinder and using only the cleaning mechanism of the blanket cylinder. And the plate cylinder can be washed at the same time.

After a predetermined time has elapsed since the cleaning mechanism section 30 was turned on, the cleaning stop processing is performed (S60). That is, the cleaning mechanism section 30 is turned off, and the case is turned off (each of the cases 21 to 21
23 is separated), the water supply unit 50 is turned off, and the rotation of this machine (each cylinder 21 to 23) is stopped. This allows
The cleaning mode is released, and the impression cylinder jacket cleaning process ends. The inking roller 61 of the inking unit 60 remains separated from the plate cylinder 21 during the impression cylinder jacket cleaning process.

Next, examples will be described.

On a 0.3 mm thick SUS plate, a film thickness of 30 μm
Spraying of Ni-Cr, 0.37 the thickness of the product was further sprayed film thickness 40μm ceramics (G-A1 ₂ 0 ₃₎
mm, and a silicone-based release agent was coated thereon to form a jacket for an impression cylinder having a surface roughness Rmax of about 30 μm. A sheet-fed offset double-sided printing machine (manufactured by Komori Corporation, Kikuzen double-sided 4 / 4-color printing machine LITHRONE 44
0SP).

Using this printing machine, double-sided printing with four process ink colors (black, indigo, red and yellow) was performed on coated paper. At the beginning of printing, the jacket of the impression cylinder was hardly soiled, but at the time of printing 10,000 sheets, the ink transferred from the paper adhered to the jacket surface to some extent.

Conventionally, the blanket is cleaned by a cleaning mechanism section for the blanket cylinder (a type in which a non-woven fabric impregnated with a cleaning solution is pressed against the blanket cylinder) every time about 10,000 sheets are printed, and then a cleaning mechanism section for the impression cylinder ( The non-woven fabric impregnated with the cleaning solution is directly pressed against the impression cylinder jacket) to clean the impression cylinder jacket. In this case, since non-woven fluff remains on the jacket, the jacket is manually wiped for finishing.

In the embodiment of the present invention, after printing 10000 sheets, the machine (each cylinder) is rotated at a low speed (3000 rp).
m constant speed), and set the water supply roller in the water supply section to water volume 3
It turned on in the (settable range of water volume 1 to 10).
Then, the machine (plate cylinder) turns on after three rotations (the blanket cylinder contacts the plate cylinder and the impression cylinder to rotate. At this time, the preset printing pressure between the blanket cylinder and the impression cylinder is
Further, the cleaning mechanism was turned on, and the plate cylinder, the blanket cylinder, and the impression cylinder were contact-rotated for 3 minutes while the nonwoven fabric impregnated with the cleaning liquid was pressed against the blanket cylinder.

Then, the machine (each cylinder) is stopped, and the plate cylinder,
When observing the blanket cylinder and the impression cylinder, the ink was cleanly removed not only on the blanket cylinder but also on the surface of the jacket attached to the impression cylinder. Moreover, there is no fluff left on the jacket as it was when the nonwoven fabric is directly pressed and washed, and since water is also added to the jacket, the paper powder, which is easily soluble in water, also falls cleanly. The effect of the impression cylinder jacket cleaning device was extremely excellent. Also, since water was supplied to the plate cylinder before putting it in the cylinder,
I was able to continue the next printing without any trouble of making the plate surface oil-sensitive due to the cleaning liquid from the blanket cylinder.

An impression cylinder jacket cleaning device by rotating the blanket cylinder and the impression cylinder in contact with each other only by the cleaning mechanism of the blanket cylinder has many achievements in actualizing the technology described in Japanese Patent Laid-Open No. 8-12151. As for the life of the jacket for the impression cylinder, it extends about twice as long as the time of hand-washing.
-When using an impression cylinder jacket cleaning device that directly presses the non-woven fabric or brush roll against the jacket for the impression cylinder, the life of the jacket for the impression cylinder is reduced to about half that of the manual cleaning. It has a track record of being lost.
As described above, the impression cylinder jacket cleaning device described in the above publication is very excellent, but as described above, the applicable type of sheet-fed offset double-sided printing machine is the blanket cylinder as the cylinder insertion mechanism. It was limited to some parts that adopted the method of hitting the impression cylinder and subsequently hitting the plate cylinder.

According to the present invention, in a printing machine employing a cylinder inserting mechanism in which the blanket cylinder also contacts the plate cylinder when the blanket cylinder is brought into contact with the impression cylinder for cleaning, If only the cleaning mechanism having a cleaning body for the blanket cylinder is used in the state of being in contact with the blanket cylinder, the cleaning liquid comes into contact with the plate cylinder from the blanket cylinder to desensitize the plate surface. For the problem that the impression cylinder jacket cleaning device cannot be applied, in order to avoid contact with the cleaning liquid, the plate cylinder should originally be separated from the blanket cylinder, but the blanket cylinder and the plate cylinder are intentionally brought into contact with each other. On the other hand, the problem was solved by adding a new idea of preventing the sensitization of the plate surface by supplying water to the surface of the plate cylinder to float the cleaning liquid on the water. The effect equivalent to that of the impression cylinder jacket cleaning device described in the above publication can be applied to almost all sheet-fed offset double-sided printing machines, and as described above, water from the plate surface is also supplied to the impression cylinder. Not only the ink on the jacket but also the paper dust that is not soluble in the detergent can be washed off, and the effect is very large.

The present invention is not limited to the above-mentioned embodiments, but within the scope of the claims.
Various modifications can be made.

For example, in the above-mentioned embodiment, the case where the impression cylinder jacket cleaning device is applied to a sheet-fed offset double-sided printing machine which employs a method of alternately printing the front and back sides without reversing the paper has been described. Needless to say, the present invention can also be applied to a method of printing by reversing the front and back sides of paper.

[0074]

As described above, according to the present invention,
The ink on the jacket mounted on the impression cylinder is softened by the cleaning liquid of the cleaning body brought into contact with the blanket cylinder due to the contact rotation of the blanket cylinder and the impression cylinder, and is easily transferred to the blanket cylinder in reverse and transferred onto the blanket cylinder. It is thoroughly washed with the ink. Here, since no slip occurs between the blanket cylinder and the impression cylinder, wear of the release agent on the surface of the jacket mounted on the impression cylinder does not occur. Further, since the non-woven fabric is not brought into direct contact with the jacket, the fluff of the non-woven fabric does not remain on the jacket, and it is possible to prevent the occurrence of defective white spots in the next printing.

Further, even when a method in which the blanket cylinder first hits the plate cylinder and then hits the impression cylinder as the cylinder insertion mechanism of the printing machine, the cleaning liquid contacts the plate surface through the blanket cylinder, By supplying water to the cleaning liquid, the cleaning liquid does not float on the water, and the plate surface is not sensitized. Moreover, since the water from the plate surface is also supplied to the impression cylinder via the blanket cylinder, there is an advantage that it is possible to easily remove not only the ink on the jacket but also the paper powder which is not soluble in the cleaning agent.

In addition, a slight electric sequence improvement in a general printing machine can be achieved by using only the cleaning mechanism having the cleaning body for the blanket cylinder without the cleaning mechanism having the cleaning body for the impression cylinder. Thus, the blanket cylinder, the impression cylinder, and the plate cylinder can be simultaneously cleaned.

Therefore, the cleaning effect is high, the release agent is not abraded or dropped by cleaning, no fluff is left on the non-woven fabric, and it can be applied regardless of the method of the body insertion mechanism. With a simple mechanism, initial cost and running can be achieved. It is possible to provide an impression cylinder jacket cleaning device that is extremely inexpensive.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a sheet-fed offset double-sided printing machine to which an impression cylinder jacket cleaning device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing an example of a configuration of a printing unit 11.

FIG. 3 is a diagram showing an example of a configuration of an impression cylinder 23.

FIG. 4 is a partially enlarged sectional view schematically showing an example of the configuration of the jacket 25.

FIG. 5 is a cross-sectional view in which a part of FIG. 4 is further enlarged.

FIG. 6 is a flowchart showing the operation of the impression cylinder jacket cleaning device.

FIG. 7 is a view showing a first type of conventional impression cylinder jacket cleaning device.

FIG. 8 is a view showing a second type of conventional impression cylinder jacket cleaning device.

FIG. 9 is a view showing a third type of conventional impression cylinder jacket cleaning device.

[Explanation of symbols]

10 ... Printing department, 11-18 ... printing unit, 21 ... plate cylinder, 22 ... Blanket body, 23 ... impression cylinder, 24 ... impression cylinder body, 25 ... jacket, 26 ... Metal plate, 27 ... Base layer, 27a ... Metal sprayed layer, 27b ... Ceramic sprayed layer, 28 ... Low surface energy resin layer, 30 ... Washing mechanism section, 31 ... nonwoven fabric, 32 ... Winding shaft, 50 ... water supply section, 51 ... Water supply roller, 52 ... aquarium, 60 ... Inking section, 61 ... Inking roller, 70 ... Paper feeding section, 80 ... Paper output section, P ... paper.

Claims (11)

[Claims] 1. A jacket having a flexible metal plate, a base layer formed on the metal plate and having surface irregularities, and a low surface energy resin layer formed on the base layer. What is claimed is: 1. An impression cylinder jacket cleaning device in a sheet-fed offset double-sided printing machine having an attached impression cylinder, comprising a cleaning body that can contact and separate from a blanket cylinder that faces the impression cylinder, and a plate cylinder that faces the blanket cylinder. Water supply means capable of supplying water to the plate cylinder by the water supply means to bring the plate cylinder and the blanket cylinder, and the blanket cylinder and the impression cylinder into contact with each other, and the cleaning body And a control means for rotating the respective cylinders in contact with each other for a certain period of time while the blanket cylinders are in contact with each other. 2. The pressure drum jacket cleaning device according to claim 1, wherein the cleaning body is a non-woven fabric which is preliminarily impregnated with a cleaning liquid before the cleaning operation. 3. The pressure drum jacket cleaning device according to claim 1, wherein the cleaning body is a non-woven fabric to which a cleaning liquid is supplied and impregnated during a cleaning operation. 4. The pressure drum jacket cleaning device according to claim 1, wherein the cleaning body is a brush to which cleaning liquid is supplied during cleaning operation. 5. The water supply means has a water supply roller capable of contacting and separating from the plate cylinder, and the control means controls the water supply roller to contact the plate cylinder when water is supplied to the plate cylinder. The pressure drum jacket cleaning device according to any one of claims 1 to 4, which is performed. 6. The control means is configured to bring the blanket cylinder and the impression cylinder into contact with each other simultaneously with or after the plate cylinder and the blanket cylinder are brought into contact with each other,
The pressure cylinder jacket cleaning device according to claim 1, wherein control is performed to move the blanket cylinder. 7. The base layer is a metal sprayed layer formed by spraying a metal.
The impression cylinder jacket cleaning device according to any one of 1. 8. The base layer comprises a metal sprayed layer formed by spraying a metal, and a porous ceramic sprayed layer formed by spraying ceramics on the metal sprayed layer. The impression cylinder jacket cleaning device according to any one of claims 1 to 6. 9. The pressure drum jacket cleaning device according to claim 1, wherein the low surface energy resin is a silicone-based resin. 10. A jacket having a flexible metal plate, a base layer formed on the metal plate and having surface irregularities, and a low surface energy resin layer formed on the base layer. A method for cleaning an impression cylinder jacket in a sheet-fed offset double-sided printing machine including an attached impression cylinder, comprising rotating the impression cylinder, a blanket cylinder facing the impression cylinder, and a plate cylinder facing the blanket cylinder. A step of supplying water to the plate cylinder, a step of bringing the plate cylinder and the blanket cylinder, and the blanket cylinder and the impression cylinder into contact with each other, and a cleaning body capable of contacting and separating from the blanket cylinder, And a step of bringing the blanket cylinder into contact with the blanket cylinder. 11. The step of bringing the plate cylinder and the blanket cylinder into contact with each other is performed simultaneously with or after the step of bringing the plate cylinder and the blanket cylinder into contact with each other. Claim 1
The method for cleaning an impression cylinder jacket according to 0.