JP3235080B2 - Blanket body and blanket union - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combination of a blanket cylinder used in an offset printing press and a blanket mounted on the blanket cylinder.

[0002]

2. Description of the Related Art An offset printing press is generally provided with a plate cylinder, a blanket cylinder, and an impression cylinder which are rotatably supported by the printing press. A plate having a predetermined pattern to be printed is attached to the plate cylinder, and a blanket is attached to a surface of the blanket cylinder. The ink applied in a predetermined pattern on the plate is temporarily transferred to a blanket, and then the ink pattern is transferred from the blanket to a printing material such as paper to perform printing.

[0003] In such an offset printing press, the blanket used is usually in the form of a single flat sheet, and when the blanket is applied to the blanket cylinder, opposing ends of the blanket sheet are connected to the blanket cylinder. The blanket is inserted into the gap formed in the axial direction, and the blanket is appropriately tightened. Therefore, the surface of the blanket wound in a cylindrical shape is not necessarily a completely continuous surface, and the gap at the joint portion remains.

[0004] When a printing operation is performed in such a state, a gap is formed at a joint portion of a blanket.
Pressure fluctuations often occur, which can cause vibration and shock loads throughout the printing press. Such a situation has a significant adverse effect on print quality. In addition, the gap is a so-called useless portion that cannot be provided to the printing unit. In addition, the above-mentioned attaching operation for attaching the blanket to the blanket cylinder is not easy.

In order to solve such a problem, Japanese Patent Application Laid-Open No. Hei 5-301483 discloses an excessive vibration / impact load,
2. Description of the Related Art A tubular seamless blanket capable of operating a printing machine at high speed without slippage or heating of a printing surface has been proposed. According to this proposal, for example, the tubular blanket is mounted so as to fit into the blanket cylinder completely while inflating the elastic blanket while injecting pressurized air from the inside of the blanket cylinder and blowing air to the outside. You.

[0006]

However, in such a mounting method, there is a disadvantage that the mechanism is complicated and it cannot be easily attached or detached unexpectedly. In addition, the adhesion between the blanket and the blanket cylinder is determined solely by the diameter difference between the blanket and the blanket cylinder and the elasticity of the blanket, and there is a problem that the adhesion after the blanket is attached cannot be adjusted.

Further, the blanket proposed above, which is a type that is forcibly fitted over the entire circumference of one blanket cylinder, requires rigidity and is susceptible to deformation. Must be attached,
In addition, a storage space corresponding to the storage space is required.

The present invention has been made in view of such circumstances, and an object of the present invention is to easily attach / detach a blanket to / from a blanket cylinder and to adjust the adhesion after attaching the blanket. Another object of the present invention is to provide a blanket cylinder-blanket combination in which the handling of the blanket, such as the method of transporting and storing the blanket, is relatively easy.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a blanket cylinder and a blanket cylinder for temporarily receiving an image of a plate and transferring the received image to a printing material. A combination of the blanket cylinder and the blanket, wherein the combination of the blanket cylinder and the blanket includes a blanket cylinder having two or more roller-shaped rotating bodies, and a cylinder wound around the two or more roller-shaped rotating bodies of the blanket cylinder. , And at least one of the two or more roller-shaped rotating bodies is movable so as to change a gap between two or more existing roller-shaped rotating bodies. Will be installed.

[0010]

According to the present invention, the blanket cylinder has two or more roller-shaped rotating bodies, and these rotating bodies are wound around a cylindrical blanket.
The roller-shaped rotating bodies are movable so that the gap between two or more roller-shaped rotating bodies can be changed.

Therefore, when mounting the blanket,
Once the gap between the rotating bodies is once narrowed, the blanket is looped around, and then the gap between the rotating bodies is widened, so that the blanket can be easily mounted. At this time, the adhesion (tension) of the blanket can be adjusted. When removing the blanket, the gap between the rotating bodies may be narrowed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view schematically showing a state in which a single-sided printing is performed on a printing material 7 such as paper using a combination 1 of a blanket cylinder and a blanket (hereinafter, simply referred to as “combination 1”). It is.

In FIG. 1, reference numeral 4 denotes a rotatable plate cylinder 4 carried on a printing press. A plate having a predetermined pattern (image) to be printed is mounted on the plate cylinder. The combination 1 of the present invention is arranged so as to be in contact with the plate cylinder 4.

The combination 1 is a combination of a blanket 30 and a blanket cylinder 20 for temporarily receiving an image of a plate having a predetermined pattern and transferring the received image to the print substrate 7. Then, an impression cylinder 40 is pressed against such a combined body 1 via a printing material 7. Under such a mechanism, the ink applied in a predetermined pattern on the plate is temporarily transferred to a blanket 30, and then the ink pattern is transferred from the blanket 30 to a printing material 7 such as paper. Printing is performed.

In the present invention, the blanket cylinder 20 includes two or more, in particular, two to five roller-shaped rotating bodies, and in this embodiment, two roller-shaped rotating bodies 21 and 22.
Is exemplified.

At least one of the two or more roller-shaped rotators 21 and 22 is at least one of the two or more roller-shaped rotators 21 and 22.
It is movably installed so that the gap between the two can be changed. As the movable installation mechanism, various known mechanisms can be adopted, for example, by a mechanism using a stroke of a driving device such as an air cylinder or a hydraulic cylinder. Since the at least one roller-shaped rotating body is configured to be movable in this manner, the blanket 30 can be easily attached and detached, and the blanket 30 can be easily removed.
Can be easily adjusted. Also, the mounting size of the blanket 30 can be changed.

In addition to the above mechanism, the two or more roller-shaped rotating bodies 21 and 22 are detachable and replaceable, and can be replaced with another rotating body having a different diameter. ing. With such a configuration, the mounting size of the blanket 30 can be changed.
In addition, the so-called nip width at the time of printing can be changed.

A seamless tubular (endless belt-shaped) blanket 30 is wound around two roller-shaped rotating bodies 21 and 22 constituting such a blanket cylinder.

The cross-sectional laminated structure of the blanket 30 is not particularly limited, and includes, for example, a normal laminated structure including a surface rubber layer, a support layer, and a compression layer provided as necessary.

The surface rubber layer is a portion on which ink is directly applied, and synthetic rubber such as NBR, EPDM, silicone rubber, butyl rubber, natural rubber, or the like is used as the material of the surface rubber layer.

The compression layer provided as needed is interposed between the surface rubber layer and the support layer, for example, and is mainly used to play a role in buffering the printing pressure during printing. As the material, the same material as the surface rubber layer is used, and specific examples include NBR, EPDM, silicone rubber, butyl rubber and the like.

Examples of the material used for the support layer include glass fiber cords and aramid cords.

A tubular (endless belt-shaped) blanket 30 having such a cross-section laminated structure and having no seams is formed, for example, by forming a toothed cloth on a cylindrical mold having a toothed shape of a belt. , A cord is wound thereon, and a rubber is further wound thereon, and then heat and pressure are applied thereto, and the rubber is inserted into the groove and heat-formed. Usually, thereafter, the surface is polished to adjust the thickness.

The blanket 3 used in the present invention
Numeral 0 is used by being wrapped around a blanket 20 made up of two or more roller-shaped rotating bodies (at least one of which is movable) as described above, and is easily attached and detached, and the adhesion (tension) of the blanket is used. Can be adjusted, and the blanket 30 can be provided with a conventional technology (for example,
Rigidity such as that disclosed in JP-A-301483) is not necessarily required. Therefore, the blanket used in the present invention does not require special care in handling such as transportation and storage. Moreover, there is no problem of storage space.

Next, a further preferred embodiment of the combination 1 of the present invention will be described in detail with reference to FIG. As shown in FIG. 2, uneven portions 21 extending in the axial direction at the same pitch are provided on the outer peripheral surfaces of the roller-shaped rotating members 21 and 22, respectively.
a, 21b and 22a, 22b are formed on the inner peripheral surface of the cylindrical blanket 30, and the concave and convex portions 30a, 30b extending in the axial direction at the same pitch, respectively.
Are formed. And these uneven portions 30a, 3
The cylindrical blanket 30 and the roller-shaped rotating bodies 21 and 22 are combined so that Ob and 21a, 21b, 22a and 22b mesh with each other. With this configuration, it is possible to reliably prevent the displacement of the tubular blanket during printing. The roller-shaped rotating body 21;
In order to form an uneven portion extending in the axial direction on the outer peripheral surface of the 22, a process such as cutting, molding, and extrusion may be performed.

In order to form an uneven portion extending in the axial direction on the inner peripheral surface of the cylindrical blanket 30, a mold having a similar shape is used.

The uneven portions 30a, 30 as shown in FIG.
FIG. 3 shows a preferred example of the lamination of the blanket 30 including the b.
Shown in As shown in this figure, the blanket 30
For example, a support layer 31, a surface rubber layer 32 formed thereon, and a tooth rubber 33 formed below the support layer 31.
And a tooth cloth 34 coated thereon. As the support layer 31, for example, a core fiber such as a glass fiber cord or an aramid cord is used. For the surface rubber layer 32, for example, NBR is used. For the tooth rubber 33, for example, NBR is used. For the tooth cloth 34, for example, nylon is used. .

By the way, as shown in FIGS. 2 and 3, if it is not possible to form unevenness extending in the axial direction,
It is preferable that the outer peripheral surfaces of the roller-shaped rotating bodies 21 and 22 and the inner peripheral surface of the cylindrical blanket 30 be subjected to anti-slip processing.

As the non-slip processing to be performed on the outer peripheral surfaces of the roller-shaped rotating bodies 21 and 22, for example, a method of forming a viscoelastic body such as rubber on the surface or the whole may be mentioned. As the non-slip processing applied to the inner peripheral surface of the cylindrical blanket 30, similarly to the above, for example, a method in which the surface or the whole is made of a viscoelastic material such as rubber is exemplified.

Next, a modification of the combination of the present invention is shown in FIG. The combination 1 'shown in FIG. 4 differs from the combination 1 shown in FIG. 2 in that a third rotating body 23 is further interposed between the roller-shaped rotating bodies 21 and 22. It is. The third rotating body 23 may be movably installed, and is used, for example, to adjust the tension of the tubular blanket 30 or to adjust the length.

In the example of FIG. 4, the diameter of the rotating body 23 is set smaller than those of the other rotating bodies 21 and 22 and plays a kind of auxiliary role. The size may be about the same as the others, and these may be arranged in a substantially triangular shape (further expanded to a quadrangle or more).

FIG. 5 shows a combination 1 of the present invention.
A state in which these are arranged so as to be sandwiched between the print substrates 7 and two-side printing is performed on the print substrate 7 such as paper is schematically shown. As described above, the combination 1 of the present invention can of course be applied to double-sided printing, and even in this case, each combination 1 exhibits the effects of the present invention.

In the present invention, the installation position of the plate cylinder 4 is basically not limited to any position as long as it can be in contact with the blanket 30.

[0035]

The combination of the blanket cylinder and the blanket according to the present invention is wrapped around a blanket cylinder having two or more roller-shaped rotating bodies and two or more roller-shaped rotating bodies of the blanket cylinder. Equipped with a tubular blanket,
At least one of the two or more roller-shaped rotating bodies
The two roller-shaped rotating bodies are installed so as to be movable so that the gap between two or more roller-shaped rotating bodies can be changed, so the blanket can be easily attached to and detached from the blanket cylinder. This makes it possible to adjust the adhesion of the blanket, and to carry out the handling of the blanket in a transporting or storing manner relatively easily.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a state in which one-side printing is performed on a printing material such as paper using a combination of a blanket cylinder and a blanket.

FIG. 2 is a perspective view showing an example of a combination of a blanket cylinder and a blanket in the present invention.

FIG. 3 is a cross-sectional view showing one preferred example of laminating a blanket having an uneven portion.

FIG. 4 is a perspective view showing an example of a combination of a blanket cylinder and a blanket in the present invention.

FIG. 5 is a diagram schematically showing a state in which double-sided printing is performed on a printing material such as paper using a combination of a pair of blanket cylinders and blankets.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Blanket cylinder and blanket combination 20 ... Blanket cylinder 21, 22 ... Roller-shaped rotating body 21a, 21b; 22a, 22b ... Irregular part 30 ... Blanket 30a, 30b ... Irregular part

Claims (5)

(57) [Claims] An offset printing machine for receiving an image of a plate once and transferring the received image to a printing substrate .
A combination of a blanket cylinder and a blanket, wherein the combination of the blanket cylinder and the blanket includes a blanket cylinder having two or more roller-shaped rotating bodies, and two or more roller-shaped rotating bodies of the blanket cylinder. A cylindrical blanket wound around the at least one of the two or more roller-shaped rotating bodies.
A combination of a blanket cylinder and a blanket, wherein the plurality of roller-shaped rotating bodies are movably installed so as to change a gap between two or more roller-shaped rotating bodies. 2. An uneven surface is formed on an outer peripheral surface of the roller-shaped rotating body and an inner peripheral surface of the cylindrical blanket, and the cylindrical blanket and the cylindrical blanket are meshed with each other. 2. The combination of a blanket cylinder and a blanket according to claim 1, wherein the combination is a roller-shaped rotating body. 3. An outer peripheral surface of the roller-shaped rotating body,
2. A non-slip processing is applied.
The blanket cylinder and blanket union described. 4. The combination of a blanket cylinder and a blanket according to claim 1, wherein the inner peripheral surface of the cylindrical blanket is subjected to anti-slip processing. 5. The blanket cylinder and blanket combination according to claim 3, wherein the non-slip processing is performed by providing a viscoelastic body such as rubber.