JPH07266533A - Printing machine - Google Patents

Abstract

PURPOSE:To solve fan out misregistnation caused by an expansion property of paper) by decreasing an unit length of printing. CONSTITUTION:In a printer wherein ink is supplied to a printing area part of a plate equipped to a plate cylinder from an ink roller system 6, and dampening water is supplied to a non-image area part thereof from a dampening water supply system 7, a belt blanket 4 pivoting by being wounded on guide rollers 5, 5 is used as the blanket which rotates in contact with a printing plate fitted to the plate cylinder 1, receives an ink image from the printing plate, and transfers it to printing paper 3. The blankets 4 are arranged in an inclined state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt blanket type printing machine which can be applied to various printing machines such as a sheet-fed printing machine and uses a blanket which is a main element of the printing machine as a belt type blanket.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional newspaper printing press tower unit (double-sided, four-color printing). In the case of FIG. 6, front and back printing units for four colors are vertically stacked. That is, ink is supplied from the ink roller system 6 to the plate mounted on the plate cylinder 1 and water is supplied from the dampening water supply system 7, ink is deposited only on the image area, and transferred to the blanket mounted on the blanket cylinder 2. Then, the image is transferred to the printing paper 3 running from the lower side to the upper side in the drawing to perform printing.

[0003]

The above-mentioned conventional blanket is a flat plate type and is used by winding the blanket cylinder 2 around its both ends. A plate is in contact with the blanket, and an ink roller system 6 for supplying ink and dampening water and a dampening water supply system 7 are connected to the plate. Therefore, the arrangement of the blanket cylinders 1 cannot be arranged close to each other as shown in FIG. 7 as long as the structure of the conventional printing unit is used, and as a whole, as shown in FIG. The printing unit length L between the four-color printing units is currently about 3 m.

The paper receives ink and fountain solution each time the first to fourth colors are printed. When L shown in FIG. 7 is large, the residence time of the paper becomes long, and especially the dampening water increases the moisture content of the paper to elongate the paper, and the Young's modulus also changes. Fan-out occurs (fan-out: misalignment due to paper elasticity). Therefore, various measures have been conventionally made in order to reduce the fan-out, but it is basically to shorten the printing unit length L shown in FIG. The present invention is intended to provide a belt blanket type printing machine capable of eliminating fan-out by using a belt type blanket.

[0005]

Therefore, according to the present invention, the ink is supplied from the ink roller system to the image area of the plate mounted on the plate cylinder, and the dampening water supply system is applied to the non-image area. In a printing machine to which water is supplied, an endless belt blanket is used as a blanket that rotates in contact with the printing plate attached to the plate cylinder to receive the ink image from the printing plate and transfer it to the printing paper. In addition, the belt blanket is wound around a guide roller so as to rotate, and the diameter of the guide roller is smaller than that of the plate cylinder. Further, the belt that is wound around the guide roller and rotates. The blanket is arranged so as to be inclined with respect to the traveling direction of the printing machine, and this is used as means for solving the problem.

[0006]

[Function] By supplying ink to the image area of the plate mounted on the plate cylinder from the ink roller system and dampening water to the non-image area from the dampening water supply system, a printed image is formed on the belt blanket. And then transferred to paper for printing. The belt blanket is wound around guide rollers and runs at the same running speed as the plate and the paper. In the present invention, by using the belt blanket, it is possible to increase the degree of freedom in the layout of the printing unit and reduce the length L of the printing unit, thereby eliminating the fanout.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 5 show the embodiments of the present invention. In the present invention,
In order to shorten the length L of the printing unit shown in FIG.
As shown in FIGS. 1 and 2, the belt blanket 4 is used, and the belt blanket 4 is wound around the guide rollers 5 and 5 to rotate. Further, the printing unit length can be further shortened by reducing the diameter of the guide roller 5a as shown in FIG. Also in the present invention, as shown in the embodiment of FIGS. 1 and 2, ink is applied from the ink roller system 6 to the image area of the plate mounted on the plate cylinder 1 and dampening water is applied to the non-image area. The dampening water is supplied from the supply system 7. Further, by disposing the belt blanket 4 in an inclined shape with respect to the printing paper 3, the length L and the width of the printing unit can be reduced.

Further, as shown in FIG. 3, a tension roller 12 may be provided to adjust the tension of the belt blanket 4, and as shown in FIG. 4, cleaning for removing the ink remaining on the belt blanket 4. Device 13
It can also be provided. The structure of the belt blanket 4 is, as shown in FIG. 5, a thin plate belt made of iron, resin, nickel or the like as a substrate 8, on which a base rubber 9, a surface base cloth 10 and a surface rubber 11 similar to a normal blanket are attached. It is manufactured by the method such as ru.

The operation of the embodiment constructed as described above will be described. Ink is applied from the ink roller system 6 to the image area of the plate mounted on the plate cylinder 1 and dampening water is applied to the non-image area. The dampening water is supplied from the supply system 7, the print image is transferred to the belt blanket 4, and then transferred to the printing paper 3 for printing. The belt blanket 4 is wound around the guide roller 5 and travels at the same traveling speed (peripheral speed) as the plate and the paper (basically the same speed as the paper. In addition, because of the print transfer relationship with the plate. There may be a slight difference in peripheral speed). That is,
The difference from the conventional printing method is that the belt blanket 4 is used.

Further, the diameter can be made smaller than the diameter of the plate cylinder 1 having the same diameter as the guide roller 5 of FIG. 1 like the guide roller 5a of FIG. The guide roller may be reduced in diameter only at the guide roller on the side closer to the paper. On the other hand, when the tension of the belt blanket 4 needs to be adjusted, the tension roller 12 shown in FIG. 3 can be used. Further, the overall length of the belt blanket 4 is set to an integral multiple of the circumference of the plate, and the transfer of the ink / fountain solution from the plate to the belt blanket 4 is repeated at the same place. Further, as shown in FIG. 4, by providing a cleaning device 13 for removing the ink remaining on the belt blanket 4, it is possible to release the restriction on the total length of the belt blanket 4 (an integral multiple of the plate circumference length).

[0011]

As described in detail above, according to the present invention, by using a belt blanket, fan-out can be eliminated, the degree of freedom in the layout of the printing section can be increased, and the length L of the printing unit can be shortened. it can.
The length of the printing unit can be further shortened by reducing the diameter of the guide roller that winds the belt blanket.
As a result, the dampening water penetrates into the paper, the paper is stretched, and the paper can be passed through the printing unit in a time shorter than the time until the fan-out failure occurs, and the printing quality can be kept good. That is, it is possible to prevent the fan-out failure by shortening the residence time of the paper in the printing unit. Furthermore, reducing the diameter of the guide roller is also effective in preventing double-sided paper (paper is in contact with the blanket twice and causing misalignment of printing) when the paper is separated from the blanket, and is used for commercial offset printing. It can also be applied to rotary presses. Further, by disposing the belt blanket in an inclined shape with respect to the traveling direction of the printing paper, it is possible to shorten the printing length and also the printing unit width.

[Brief description of drawings]

FIG. 1 is a side view showing an arrangement example of various rollers of a printing machine according to a first embodiment of the present invention.

FIG. 2 is a side view showing an arrangement example of various rollers of a printing machine according to a second embodiment of the present invention.

FIG. 3 is a side view showing a belt blanket tension mechanism in a printing machine according to a third embodiment of the present invention.

FIG. 4 is a side view showing a belt blanket cleaning device in a printing machine according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of the belt blanket showing the first embodiment of the present invention.

FIG. 6 is a side view showing a tower unit of a conventional newspaper press.

7 is an explanatory diagram showing a printing unit length in the rotary press of FIG.

[Explanation of symbols]

 1 plate cylinder 3 paper 4 belt blanket 5 and 5a guide roller 6 ink roller system 7 dampening water supply system 8 substrate 9 base rubber 10 surface base cloth 11 surface rubber 12 tension roller 13 cleaning device

Claims (6)

[Claims] 1. A printing machine in which ink is supplied from an ink roller system to an image area of a plate mounted on a plate cylinder and dampening water is supplied to a non-image area from a dampening water supply system. A printing machine characterized by using an endless belt blanket as a blanket that rotates in contact with a printing plate attached to a plate cylinder to receive an ink image from the printing plate and transfer it to printing paper. 2. The belt blanket is wound around a guide roller so as to rotate.
Printing machine described. 3. The printing machine according to claim 2, wherein the guide roller has a diameter smaller than that of the plate cylinder. 4. The printing machine according to claim 1, wherein a belt blanket which is wound around the guide roller and rotates is arranged in an inclined shape with respect to a running direction of the printing machine. 5. The printing machine according to claim 1, further comprising a tension roller for adjusting the tension of the belt blanket. 6. The printing machine according to claim 1, further comprising a cleaning device for removing ink remaining on the belt blanket.