JP3298403B2 - Offset rotary printing press and two-ribbon offset printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset rotary printing press, and more particularly, to a two-web type offset rotary printing press using two windings having a width of half or less of a printable printing material. It is an object of the present invention to provide an offset rotary printing press and a two-ribbon offset printing method for simultaneously supplying and printing to a printer.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional two-web type web offset printing press is provided with two paper feeders 11 and 12 in a paper feed unit 1, and each of the paper feeders 11 and 12 receives a signal. The printing materials P1 and P2 are supplied. The printing material P1 supplied from the paper feeder 11 passes through the upper infeed unit 21 of the infeed unit 2, enters the printing unit unit 3, is dried by the upper dryer 51 of the drying unit 5, and is cooled by the upper unit of the cooling unit 6. After being cooled by the press 61, it is guided to the folding unit 8, where it is folded and cut into a printed book 80. On the other hand, the print material P2 (shown by a broken line) supplied from the paper feeder 12 passes through the lower infeed machine 22 of the infeed section 2 and enters the printing unit section 4, and is dried by the lower dryer 52 of the drying section 5. , After being cooled by the lower cooler 62 of the cooling unit 6, guided to the folding unit 7,
The printed book 70 is folded and cut.

In this conventional example, the number of printing units is two, but the number of printing units may be increased by the number of colors to be printed. For example, if there are eight printing units, four colors in Table
A printed material with four back colors is obtained. The two-web type web offset printing press has at least two sets of devices in each section.

[0004] In a conventional offset rotary press, a printing material that is out of design specifications (hereinafter, described with frequently used paper,
(It is not limited to paper). That is, each equipment may be arranged only within the range that can satisfy the specifications, but when the paper width becomes narrow,
In a printing machine of the type in which the blanket cylinder to which ink is transferred from the plate cylinder in the printing unit is opposed and the paper passes between them, printing is performed on both sides together, the area where the blankets contact each other increases, and printing occurs due to heat generation. This is because failures occur and the life of the blanket is shortened.

For this reason, for example, in a double-width offset rotary press, at present, only double-width printing paper can be used. However, in recent years, small lots of printed materials have been advanced, and the efficiency of a double-width offset rotary press has been reduced, and a situation has arisen in which it is not possible to operate sufficiently.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an offset rotary printing press capable of printing two windings each having a width equal to or less than half of the maximum printable paper width in parallel.
It is an object to provide a ribbon offset printing method.

[0007]

According to a first aspect of the present invention, there is provided a paper feeding unit, an infeed unit, a printing unit, a drying unit, a cooling unit, a folding unit, and the like. In a two-web web offset press,
A means for moving left and right with respect to the traveling direction of the printing material traveling position comprising a turn bar is provided between the take-up sheet feeding section and the infeed section, and two-sided printing is performed using two take-up sections. An offset rotary printing press characterized by the above feature. As described above, since the means for moving to the left and right is provided, the conventional two-web type web offset printing press can be modified so that two-ribbon offset printing can be performed without difficulty.

According to a second aspect of the present invention, there is provided a two-web type web offset press including a take-up sheet feeding section, an infeed section, a printing unit section, a drying section, a cooling section, and a folding section. 2 rolls less than half the width of printed matter
This is a two-ribbon offset printing method, in which two pieces are supplied in parallel to each part of the offset rotary printing press and printing is performed on both sides simultaneously. As described above, two windings having a width equal to or less than half of the specification paper width of the printing press are simultaneously performed in parallel to perform double-sided printing. Therefore, for example, a two-web type web offset printing press for double width, full width, etc. Can be performed, the operation rate of the two-web type web offset printing press can be improved, the production amount can be increased, and the production efficiency can be increased.

[0009]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic explanatory view showing an embodiment of an offset rotary printing press according to the present invention. A roll having a half of the maximum printable paper width was mounted on the paper feeders 11 and 12 of the paper feed unit 1. In FIG. 1, the near side is the operation side. If the take-up can be mounted on the operation side, it is sufficient to mount the take-up. However, in many cases, the paper feed arm cannot be moved to the operation side due to a structural problem of the driving device, and the take-up is mounted on the drive side. The running position of the sheet P1 mounted on the sheet feeder 11 is changed to the operation side by means of the right and left moving means 9 comprising a turn bar, and enters the infeed section 2 and enters the operation side of the printing unit sections 3 and 4. The sheet P2 mounted on the sheet feeder 12 travels straight and enters the infeed section 2 and enters the drive side of the printing unit sections 3 and 4.

[0010] P1 entering the operation side half in the printing unit section
And P2 entered in the driving half are printed in parallel thereafter,
The ink is dried by hot air in the drying unit 5 and enters the cooling unit 6 to fix the ink. Thereafter, the sheet P1 is guided to the folding unit 8, and the sheet P2 is guided to the folding unit 7, where the sheet P1 is folded and cut into a book 80 and a book 70. The offset rotary printing press of the present invention is provided with a means for moving the running position of the paper supplied from the winding to the left and right, so that it is possible to perform two-ribbon offset printing in which two windings are printed side by side without difficulty. Is what you do.

The gist of the two-ribbon printing method is to use two windings each having a width equal to or less than half of the maximum printable paper width, and to perform processing from printing to cooling in parallel and simultaneously. The supply to the folding machine may be changed in any manner. The winding method can be mounted on the operation side from the beginning according to the design of the device, and can be performed without the above-mentioned right and left moving device. Also, two paper feeders can be mounted side by side on one shaft.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> An offset rotary printing press as shown in FIG. 1 having four printing units (front 4 colors + back 4)
Color) was printed. Maximum printing width of machine is 1760m
m, but two windings having a width of 765 mm were used. One was mounted on the paper feeder 11 and the other was mounted on the paper feeder 12. The basis weight was 80 g / m ² . Then, as shown in FIG. 1, two sheets of paper 70 and 80 were obtained by printing, drying, cooling, folding and cutting two sheets of paper running in parallel (two ribbons). In this embodiment, exactly the same paper is used, but printing can be performed unless the paper is extremely different.

Example 2 Printing was performed on an offset rotary press (two colors for front and two colors for back) as shown in FIG. Although the maximum paper width of the machine is 880 mm, two rolls of 385 mm width were used. One was mounted on the paper feeder 11 and the other was mounted on the paper feeder 12. The basis weight was 70 g / m ² . Then, as shown in FIG. 1, two sheets of paper 70 and 80 were obtained by printing, drying, cooling, folding and cutting two sheets of paper running in parallel (two ribbons).

[0014]

According to the first aspect of the present invention, by modifying a conventional two-web type web offset printing press, two-ribbon offset printing can be performed without difficulty, and a double-width or full-width paper of a small lot can be used. Even if the printing efficiency is reduced if the printing is performed according to the specifications, the efficiency can be increased by the two-ribbon offset printing and the operation rate of the printing press can be increased.

According to a second aspect of the present invention, there is provided a two-web type offset rotary printing press, wherein two windings each having a width equal to or less than half of a printable printing material are used and two parts of the offset rotary printing press are arranged in parallel. This is a two-ribbon offset printing method in which printing is performed at the same time, and two windings having a width equal to or less than half of the specification paper width of the printing press are simultaneously printed in parallel. With the offset rotary printing press, full-width and half-width offset printing can be performed, respectively, so that the operation rate of the two-web type offset rotary printing press can be improved, the production amount can be increased, and the production efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an offset rotary printing press according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of a conventional offset rotary printing press.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Paper feed part 2 ... In feed part 3, 4 ... Printing unit part 5 ... Drying part 6 ... Cooling part 7, 8 ... Folding part 9 ...
Means for moving left and right 11, 12: Paper feeder 21: Upper infeed machine 22: Lower infeed machine 51: Upper dryer 52: Lower dryer 61: Upper cooler 62
… Lower cooling machine

Continuation of the front page (56) References JP-A-7-232426 (JP, A) JP-A-55-65554 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 7 / 02 B41F 13/06

Claims (2)

(57) [Claims] In a two-web type web offset printing press comprising a take-up sheet feeding section, an infeed section, a printing unit section, a drying section, a cooling section, a folder section, and the like, the take-up sheet feed section and the infeed section are provided. An offset rotary printing press characterized by providing means for moving left and right with respect to the running direction of a printing material running position comprising a turn bar, and performing two-sided printing in parallel using two windings. . 2. In a two-web type web offset printing press comprising a take-up sheet feeding section, an infeed section, a printing unit section, a drying section, a cooling section, a folding section, etc., less than half of the printable print material. A two-ribbon offset printing method, characterized in that two rolls each having a width are used, and two rolls are supplied in parallel to each part of the offset rotary printing press to print on both sides simultaneously.