JP6922198B2 - Printing plate - Google Patents

Description

The present invention relates to a printing plate cylinder on which a printing plate can be mounted on the outer peripheral surface, and more specifically, to a printing plate cylinder capable of controlling the temperature of the outer peripheral surface of the plate cylinder during printing.

In order to perform high-speed printing while maintaining high printing accuracy, it is important to keep the ink viscosity constant. When the ink viscosity decreases, the printing density becomes unstable, especially in waterless lithograph printing and halftone dots. In the case of printing, it is important to control the temperature of the printing plate cylinder because ink easily adheres to the non-image area and causes background stains.
However, immediately after the start of operation of the printing press, especially at low temperatures such as in winter, the surface of the plate cylinder is also in a cold state due to a decrease in the atmospheric temperature, so that a long period of idle operation may be required. On the other hand, the temperature of the printing plate cylinder rises due to heat conduction from the rotating shaft due to high-speed rotation during printing, and as a result, the temperature of the printing plate also rises, and the ink viscosity tends to decrease.

In order to solve such a problem, it has been proposed to form the outer peripheral surface of the hub inside the plate cylinder in a tapered shape to generate an air flow passing through the inside of the plate cylinder to air-cool the plate cylinder (patented). Document 1).
Further, a fluid circulation space is formed inside the printing plate cylinder, and a fluid circulation means for circulating the temperature control fluid in this space and a temperature control means for controlling the temperature of the temperature control fluid according to the temperature of the plate cylinder are provided. In this printing machine, a space partitioned by an end wall that seals both ends between an outer cylindrical portion and an inner tubular portion is divided into a plurality of spaces by a partition wall, and this is divided into a plurality of spaces. The temperature of the plate cylinder is controlled by forming a fluid circulation space through the communication holes and circulating the temperature-controlled fluid (Patent Document 2).

Japanese Patent No. 3129222 Japanese Patent No. 5286508

In the above-mentioned Patent Document 1, since the plate cylinder is not directly cooled, the cooling effect is not yet sufficiently satisfied.
Further, in the printing machine described in Patent Document 2, the fluid circulation space is partitioned by the inside of the plate cylinder formed by the outer cylindrical portion to which the plate mounting surface is attached to the outer surface and the inner cylinder portion adjacent to the drive shaft. , Most of the space inside the plate cylinder constitutes a fluid circulation space. Therefore, the amount of fluid circulating in the plate cylinder is large, and if the plate cylinder is rotationally driven while the fluid is fully filled, the load applied to the printing machine also increases, which may increase the burden on the printing machine and the fluid. Temperature control is also time consuming and inefficient. In addition, if the amount of fluid is large, there is a risk of fluid leakage.

Therefore, an object of the present invention is to provide a printing plate cylinder provided with a cooling member capable of efficiently controlling the temperature of the plate cylinder surface during printing with a small amount of fluid.

According to the present invention, in a printing plate cylinder on which a printing plate can be mounted on the outer peripheral surface, the plate cylinder is formed by combining a plurality of plate cylinder outer cylinders in a cylindrical shape by a hub and the plate cylinder of the hub. A fixing portion for mounting the printing plate on the outer peripheral surface of the plate cylinder is formed at the joint portion of the outer cylinder, and a cooling member that comes into contact with the inner peripheral surface of the plate cylinder is installed inside the plate cylinder. , before Kihiya the contact surface of the plate cylinder of却部member has a recess, the plate cylinder inner circumferential surface cooling member in close contact at the portion excluding the recess, the recess of the cooling member is formed Each of the fitting portions formed in the outer cylinder of the plate cylinder is fitted so that the surface faces the inner peripheral surface of the outer cylinder of the plate cylinder. A printing plate cylinder is provided in which an outflow port is formed and a flow path of a cooling fluid for cooling the outer peripheral surface of the plate cylinder is formed by the recessed portion.

In the printing plate cylinder of the present invention,
1. 1. The inlet and outlet of the cooling fluid communicate with the flow path of the cooling fluid provided inside the plate cylinder.
2. The recess is formed as a plurality of subdivided grooves.
3. 3. At least the outer peripheral portion of the cooling member is in close contact with the inner peripheral surface of the plate cylinder via the sealing member.
4. The plate body contact surface of the cooling member has a curved surface along the inner peripheral surface of the plate body.
5. Wherein the cooling member is a plate-like, that are disposed in two places on opposite sides parallel and the axis with the axis of the plate cylinder,
Is preferable.

In the printing plate cylinder of the present invention, a cooling member that contacts the inner peripheral surface of the plate cylinder is installed in the plate cylinder, and a recess formed on the inner peripheral surface of the plate cylinder and / or the plate cylinder contact surface of the cooling member. By forming the flow path of the cooling fluid, the flow path of the cooling fluid can be formed at a position near the surface of the plate cylinder, so that the cooling efficiency can be improved. Further, since the plate cylinder can be efficiently cooled to a desired temperature with a small amount of cooling fluid, the weight of the plate cylinder can be reduced and the risk of leakage of the cooling fluid can be reduced.
In addition, by forming the recesses as subdivided grooves, not only can the plate cylinder be efficiently cooled with a small amount of cooling fluid, but also the cooling fluid can be cooled by inflowing air instead of the cooling fluid. It can be easily discharged from the flow path, and the cooling fluid does not leak when the plate cylinder is removed, and the plate cylinder does not become heavy due to the cooling fluid.
Further, in the printing plate cylinder of the present invention, by installing a cooling member corresponding to the printing plate mounted on the plate cylinder, the temperature rise of the plate cylinder surface at the position corresponding to the printing plate can be efficiently suppressed. It is possible to effectively prevent a decrease in ink viscosity.

It is a figure which shows an example of the plate cylinder of this invention, (A) is a plan view, (B) is an XX sectional view of (A), (C) is a YY sectional view of (A). It is a figure for demonstrating the cooling member attached to the plate cylinder of this invention, (A) is a plan view, (B) is a ZZ cross-sectional view of (A).

The printing plate cylinder of the present invention will be described with reference to the specific examples shown in the figure.
FIG. 1 is a diagram showing an example of a plate cylinder of the present invention. In the plate cylinder whose whole is shown by 1, the plate cylinder outer cylinders 2a and 2b divided into two are combined in a cylindrical shape by a hub 3. At the same time, a fixing portion 4 for mounting the printing plate (not shown) on the outer peripheral surface of the plate cylinder is formed at the joint portion of the plate cylinder outer cylinders 2a and 2b of the hub 3. Clamps 5a and 5b for sandwiching and fixing both ends of the printing plate are formed in the fixing portion 4, and in the specific example shown in the figure, two printing plates are formed so as to be mounted on the outer peripheral surface of the plate cylinder. Has been done. Further, the plate cylinder 1 is detachably attached to the cantilever rotation shaft 20, and in the specific example shown in the figure, the cantilever rotation shaft 20 has a large diameter on the support portion side, and the diameter increases toward the free end side. Since the hub 3 has a smaller tapered shape, the bearing portion 6 of the hub 3 is also formed in a tapered shape whose diameter increases toward the back of the drawing.
Further, on the inner surfaces of the plate body outer cylinders 2a and 2b, fitting portions 7a and 7b that match the shape of the cooling member for fitting the cooling member described later are formed.

FIG. 2 shows a plan view (A) and a cross-sectional view taken along line ZZ (B) of an example of a cooling member 10 mounted on a plate cylinder 1 of the present invention, and is cooled in this specific example. The member 10 has a flat plate shape (plate), and a narrow groove 11 is formed in a zigzag shape on one flat surface 10R of the plate. Holes 12a and 12b that penetrate the plate of the cooling member 10 in the thickness direction are provided at the start end 11a and the end end 11b of the narrow groove 11, respectively. Further, on the flat surface 10L on the side where the narrow groove 11 of the plate is not formed, when the cooling member 10 is attached to the plate body outer cylinders 2a and 2b, fasteners such as screws are attached to the plate body outer cylinders 2a and 2b (shown in the figure). A flange portion 14 having screw holes 13, 13 ... For fixing with (1) is formed.

As shown in FIG. 1, the cooling member 10 has a fitting portion formed on the plate body outer cylinders 2a and 2b so that the flat surface 10R on which the narrow groove 11 is formed faces the inner surfaces of the plate body outer cylinders 2a and 2b. It is fitted into 7a and 7b, respectively. At this time, the flange portion 14 and the inner surfaces of the plate body outer cylinders 2a, 2b are in contact with each other via the annular packing 15, and the screws 16 are located at the positions of the screw holes 13, 13 ... Formed in the flange portion 14. By 16 ..., The cooling member 10 is closely fixed to the inner surface of the outer cylinder of the plate cylinder.
The inner surface 2c of the outer cylinders 2a and 2b of the plate cylinder and the flat surface 10R on which the narrow groove 11 of the cooling member 10 is formed come into contact with each other, so that the outer surface of the plate cylinder is between the hole 12a as the inflow port and the hole 12b as the outflow port. One flow path 17 is formed in the cooling member 10 by the inner surface 2c of the cylinder and the narrow groove 11. The cooling fluid is introduced into the flow path 17 from the introduction pipe 18a connected to the hole 12a (inflow port), flows out to the outlet pipe 18b connected to the hole 12b (outlet), and the cooling fluid flows into the flow path. Can be circulated to cool the plate cylinder outer cylinders 2a and 2b.

The introduction pipe 18a communicating with the hole 12a (inflow port) of the cooling member 10a on the plate body outer cylinder 2a side and the introduction pipe 18a communicating with the hole 12a (inflow port) of the cooling member 10b on the plate body outer cylinder 2b side are hubs. It joins near the central portion of No. 3 and connects to a temperature-controlled tank (not shown), from which the cooling fluid is introduced into the flow paths 17 in the respective cooling members 10a and 10b. Similarly, the outlet pipe 18b communicating with the hole 12b (outlet) of the cooling member 10a on the plate body outer cylinder 2a side and the outlet pipe 18b communicating with the hole 12b (outlet) of the cooling member 10b on the plate cylinder outer cylinder 2b side , The cooling fluid that joins near the center of the hub 3 and passes through the flow path 17 in the cooling members 10a and 10b is discharged to the outside or the temperature is adjusted, and then returns to the tank to cool again. It can also be used by flowing into the flow path of the member and circulating.
It is preferable that the introduction pipe 18a leading to the inflow port of the cooling member is switchably connected not only to the cooling fluid tank but also to the air tank (not shown). By switching to the air tank and introducing air into the flow path, it becomes possible to discharge the cooling fluid in the flow path and leave the inside of the flow path empty, and when removing the plate cylinder, etc. Leakage of cooling fluid is effectively prevented.

The printing plate cylinder of the present invention is not limited to the specific examples described above, and various modifications can be made.
[Recess]
In the above-mentioned specific example, the recess for forming the flow path of the cooling fluid for cooling the plate cylinder is formed on the surface of the cooling member that comes into contact with the inner surface of the plate cylinder outer cylinder, but inside the plate cylinder. It may be formed on the peripheral surface (hereinafter, in the case of both the cooling member and the inner peripheral surface of the plate cylinder, the surface on which the recess is formed may be referred to as the “recess forming surface”). In this case, the cooling member may be formed with only the holes serving as the inflow port and the outflow port at the positions corresponding to the recesses formed on the inner peripheral surface of the plate cylinder, or in addition to the formation of the outflow port. A recess having the same shape as the recess formed on the inner peripheral surface of the cylinder is formed at a position corresponding to the recess formed on the inner peripheral surface of the plate cylinder, and a flow path is formed together with the concave portion formed on the inner peripheral surface of the plate cylinder. You can also.
Further, if the recess is a groove subdivided as shown in the specific example shown in the figure, a small amount of cooling fluid can be efficiently flowed over the entire surface of the cooling surface, and a large amount of cooling fluid is used. It is preferable because it is possible to prevent leakage of the cooling fluid and weight increase of the plate cylinder due to the above. Further, by forming such a narrow groove, the cooling fluid can be easily discharged from the flow path by allowing air to flow in when the plate cylinder is removed.
The cross-sectional shape of the narrow groove is not particularly limited, and various shapes such as a square shape, a U-shape, a semicircular shape, and a V-shape can be adopted. The size of the groove cannot be unconditionally specified depending on the size of the cooling member, the type of cooling fluid used, etc., but the cross section of the flow path is preferably 10 ^{to 150 mm 2, from the viewpoint of ease of flow of the cooling fluid, etc.} It is desirable to have a cross-sectional area in the range of 20-100 mm ^2.
Further, as for the recess formed on the inner peripheral surface of the cooling member and / or the plate cylinder, the entire surface partitioned by the outer peripheral edge may be a recess, and in this case, the cooling surface can be made large. Further, in the flow path composed of the subdivided grooves shown in the figure, the flow path was a zigzag-shaped flow path having a long groove in the drive axis direction of the plate cylinder, but the flow path is not limited to this, and the drive shaft direction of the plate cylinder is not limited to this. Various changes can be made, such as a zigzag shape having a long groove in the direction perpendicular to (horizontal direction).

[Cylinder outer cylinder]
In the above-mentioned specific example, the plate cylinder is formed with fixing portions of the printing plate at two places so as to mount two printing plates, and the cooling member is a plate so as to correspond to the position of the printing plate. It was installed parallel to the diameter of the body and facing the diameter, but the present invention is not limited to this. The plate cylinder may be capable of fixing one or two or more printing plates, and the position corresponding to the position of the printing plate is the same as in the case of the plate cylinder on which two printing plates are mounted as shown in the figure. A cooling member can be installed in. Further, the method of fixing the printing plate to the plate cylinder is not limited to the mode shown in the figure, and all conventionally known modes can be adopted.
Further, although a fitting portion for fitting the cooling member was formed on the inner peripheral surface of the plate cylinder, the surface of the cooling member facing the inner peripheral surface of the plate cylinder was formed as described later without forming the fitting portion. Of course, it may have a curved surface that matches the inner peripheral surface of the plate cylinder.

[Cooling member]
The cooling member may be of any shape as long as the flow path of the cooling fluid is formed by the surface of the cooling member that comes into contact with the inner peripheral surface of the plate cylinder and / or the recess formed on the inner peripheral surface of the plate cylinder. As shown in the example, when a fitting portion into which the cooling member can be fitted is formed on the inner peripheral surface of the plate cylinder, it can be formed into a shape that matches the fitting portion, or inside the plate cylinder. It may be curved along the peripheral surface. Since the contact surface of the cooling member with the inner peripheral surface of the plate cylinder is formed in a curved surface along the inner peripheral curved surface of the plate cylinder, the flow path of the cooling fluid becomes closer to the surface of the plate cylinder, and the surface of the plate cylinder Can be cooled efficiently. In this case, it is preferable that the entire cooling member is a curved (arc-shaped) plate because the weight of the cooling member can be reduced. It may be in shape.
Further, the positions of the inlet or outlet of the cooling fluid formed on the cooling member, or the pipes connected to the inlet and outlet formed inside the plate cylinder, are appropriately determined according to the shape of the plate cylinder and the like. It can be set, for example, in the specific example shown in the figure, the hole 12a (inflow port) and the hole 12b (outlet) were connected to the introduction pipe 18a and the outlet pipe 18b, but from the hole 12a (inflow port). It is also possible to directly introduce the cooling fluid and discharge it directly from the hole 12b (outlet).

Further, in the cooling member shown in the figure, a flange portion is formed so that it can be fixed to the outer periphery of the fitting portion formed on the inner surface of the outer cylinder of the plate body, and a packing is interposed at the flange portion to liquid the flow path. Although the tightness was ensured, it is not limited to this as long as it can be fixed to the inner peripheral surface of the plate cylinder so as not to cause leakage of the cooling fluid. For example, in order to bring the outer peripheral portion (outer peripheral edge portion) for partitioning the concave portion into close contact with the inner peripheral surface of the plate cylinder or the cooling member without forming the flange portion, a sealing member such as packing is interposed between them. It is also possible to form a seal member on either the entire concave portion forming surface or the entire portion in contact with the concave portion forming surface, and fix the seal member in close contact with the cooling member or the inner peripheral surface of the plate cylinder.
In the present invention, it is particularly preferable that the recess is formed in the cooling member, and at least the outer peripheral portion of the recess is in close contact with the inner peripheral surface of the plate cylinder via the seal member.

In the specific example shown in the figure, the number of cooling members and the size thereof are not limited to those of which two pieces are installed so as to sandwich the diameter connecting the fixing portions of the plate cylinder and parallel to the diameter. By installing a cooling member on the peripheral surface of the outer cylinder of the plate cylinder corresponding to the part where the plate plate is mounted according to the number of plate plates mounted on the plate cylinder, as described above, the printing plate can be efficiently produced. It becomes possible to cool the plate cylinder surface at the corresponding position.
In the cooling member of the present invention, water can be preferably used as the cooling fluid, but the fluid is not limited to this, and the fluid conventionally used for cooling is not limited to the liquid and is air. It may be a gas such as.
Further, in the present invention, the plate cylinder surface can be heated as well as cooled by flowing a fluid adjusted to a desired temperature into the cooling member, and the plate cylinder surface is adjusted to an appropriate temperature. It is possible.

1 Plate cylinder, 2 Plate cylinder outer cylinder, 3 Hub, 4 Fixing part, 5 Clamp, 6 Bearing part, 7 Fitting part, 10 Cooling member, 11 Fine groove (recess), 12 holes, 13 Screw holes, 14 Flange part , 15 packing, 16 screws, 17 flow paths, 18 tubes, 20 cantilever rotation shafts.

Claims (6)

In a printing plate cylinder that can mount a printing plate on the outer peripheral surface,
In the plate cylinder, the plate cylinder outer cylinders divided into a plurality of parts are combined in a cylindrical shape by a hub, and the printing plate is fixed to the joint portion of the plate cylinder outer cylinders of the hub for mounting the printing plate on the outer peripheral surface of the plate cylinder. The part is formed,
Inside of the plate cylinder, and the cooling member is installed to contact a plate cylinder inner circumferential surface, a recessed portion is formed on the contact surface of the plate cylinder before Kihiya却部material, except for the recess In the portion, the inner peripheral surface of the plate cylinder and the cooling member are in close contact with each other, and the mating portion formed on the outer cylinder of the plate cylinder is formed so that the surface on which the recess of the cooling member is formed faces the inner peripheral surface of the outer cylinder of the plate cylinder. Each is fitted,
The cooling member is formed with an inlet and an outlet for a cooling fluid communicating with the recess.
A printing plate cylinder characterized in that a flow path of a cooling fluid for cooling the outer peripheral surface of the plate cylinder is formed by the recessed portion. The printing plate cylinder according to claim 1, wherein the inlet and outlet of the cooling fluid communicate with a flow path of the cooling fluid provided inside the plate cylinder. The printing plate cylinder according to claim 1 or 2, wherein the recess is formed as a plurality of subdivided grooves. The printing plate cylinder according to any one of claims 1 to 3, wherein at least the outer peripheral portion of the cooling member is in close contact with the inner peripheral surface of the plate cylinder via the seal member. The printing plate cylinder according to any one of claims 1 to 4, wherein the plate cylinder contact surface of the cooling member has a curved surface shape along the inner peripheral surface of the plate cylinder. Wherein the cooling member is a plate-like, printing plate cylinder according to claim 1 which is installed in two places on opposite sides parallel and the axes to the axis of the plate cylinder.

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