JPH07256860A - Rotary press - Google Patents

Abstract

PURPOSE:To obtain a rotary press enabling printing of paper different in size to be conducted, facilitating changeover of a printing size and requiring a very small space for installation. CONSTITUTION:A rotary press 10 wherein a printing unit 38 disposed on a running route of web W is provided with at least two cylinder units 42 and 44 each of which has printing cylinders and a group of inking rollers supplying ink to these printing cylinders and is different in the printing size of the printing cylinders from the other, and wherein the web W is printed by one of these two cylinder units 42 and 44 switched over selectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary printing machine in which at least one printing unit is arranged in a running path of a material to be printed.

[0002]

2. Description of the Related Art Generally, in the field of printed publications or commercial printed materials except for gravure printing,
According to the size of the printing paper, the rotary printing press is divided into the A plate and the B plate. This is line A and B according to the base paper standard.
There are two systems of rows, and the cut-off size is different between the A-type paper of the A-row type and the B-type paper of the B-type, while the printing cylinder of the rotary press has a fixed system and the print size is fixed. For this reason, it is not possible to print both the A plate paper and the B plate paper with one rotary printing machine.

Therefore, in order to print on printing paper of both size A and B, it is necessary to install separate rotary printing machines. Each rotary press has
It is necessary to install a paper feeding device, an infeed device, a dryer, a chill roll, and a folding and discharging device, respectively, which requires an extremely large installation area.

On the other hand, in recent years, a set of printing cylinders including a plate cylinder and a blanket cylinder can be replaced by a cartridge type with a set having a different printing size, or only the plate cylinder can be replaced with a printing cylinder having a different printing size. A rotary printing machine for both the A and B plates has been developed.

Such a dual-use rotary printing machine is effective for form printing and printed matter that does not require high print quality, but it is not possible to print high-quality printed matter that requires fine adjustment. It is difficult and requires a lot of time and labor to replace the printing cylinder.
It is necessary to reserve a lot of space for the replacement work of the printing cylinder.

The present invention has been made in view of the above, and is capable of printing printing papers of different sizes and
It is an object of the present invention to provide a rotary printing press in which the print size can be easily switched and the installation space can be extremely small.

[0007]

According to the present invention, there is provided a rotary printing machine in which at least one printing unit is arranged in a running path of an object to be printed, the printing unit including a printing cylinder and a printing cylinder, respectively. At least two cylinder units each having an inking roller group for supplying ink and different printing sizes of respective printing cylinders are provided, and the printing medium is one of the two cylinder units selectively switched. A rotary printing press to be printed is provided.

[0008]

When printing with this rotary printing machine, one of the cylinder units corresponding to the size of the printing medium is selected and driven. Ink is supplied to the printing cylinder of this cylinder unit from an inking roller group provided on the cylinder.
The material to be printed is printed. The cylinder unit which is not selected does not participate in the printing, and therefore, necessary work such as printing or roller washing can be performed during this period.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a rotary printing press 10 according to an embodiment of the present invention.
Shows the whole. This rotary printing press 10 feeds a web W from a paper feed unit 12 to a printing unit 14 to print a printed web W
Is dried by the drying unit 16, cooled by the cooling unit 18, and then sent out from the folding discharge unit 20.

The paper feeding unit 12 includes a roll supporting device 22 for feeding a web W of paper or film from a roll N. The roll supporting device 22 has three arms each supporting the roll N, and is provided with an automatic paper splicing device for sequentially feeding the rolls 18 without stopping the rotary printing press 10. For example, the peripheral speed of the next roll N is synchronized with the running speed of the web W before the roll N being fed is completely unwound, and the running web W is set to the winding end of the next roll N. A method of instantly adhering may be used. After gluing, move the running web W to the knife 24.
As a result, the roll N that has been fed until then is separated.

The web W fed from the roll N is fed to the printing section 14 by the infeed device 26 with a constant tension. The in-feed device 26 prevents the lateral position of the web N from being displaced when it is unwound from the roll N due to variations in the thickness of the web W, and prevents slack or fluttering. Web W
The required tension is applied to the printed circuit board to enable precise printing. The web W is sent to the printing unit 14 with a constant tension by the infeed device 26.

The printed web W, which has been multicolor printed in the printing section 14, is dried by the dryer 28 disposed in the drying section 16 and then cooled by the chill roll unit 30 in the cooling section 18. Finally, the A-folder 32
And the B-plate folding machine 34, and after being folded and wrapped by a packaging device (not shown), they are stacked by a palletizer and sent to a bookbinding factory. Alternatively, without being folded in this way, it is wound into a roll by the rewinder 36 and sent to the bookbinding factory. When winding in a roll with this rewinder 36, the folding machine 3
Bypassing 2, 34, the chill roll unit 30 directly feeds the rewinder 36.

In the present embodiment, the printing section 14 is provided with four printing units 38 capable of printing on both sides of the web W and one replacement printing unit 40 for carrying out replacement printing as required. . The replacement printing unit 40 is for performing individual printing such as a store name or a distribution area in addition to the printing of a common pattern, and the printing unit 38 is for printing a common pattern for normal printing, that is, replacement printing. In this embodiment, four printing units 38 having the same structure can print with four color inks. Both the printing unit 38 and the replacement printing unit 40 are capable of selectively switching their printing sizes to print both the web W2 for A plate and the web W1 for B plate. It is obvious that these printing units 38 and replacement printing units 40 can be arranged in a required number according to the number of inks required for printing.

As shown in FIG. 2A, the printing unit 38 of the present embodiment is arranged on the upstream side of the web W in the flow direction R of the B plate cylinder units 42 and 42 and the downstream side thereof. Cylinder units 44 and 44 for A version. These A-plate cylinder units 44, 44 are arranged so as to face each other with the web W interposed therebetween, and printing can be performed on both sides of the web W. The same applies to the B plate cylinder units 42, 42.

Each B plate cylinder unit 42 has a blanket cylinder 46 and a plate cylinder 48 as printing cylinders.
Ink is supplied from the inking roller group 52. Similarly, each A-plate cylinder unit 44 also has a blanket cylinder 56 and a plate cylinder 58 as a printing cylinder, and is supplied with ink from the inking roller group 62 to print a desired pattern on the web surface.

These B plate cylinder unit 42 and A
As the plate cylinder unit 44, one required pair is selected according to the paper size of the printed matter. Therefore, one of the B plate cylinder unit 42 and the A plate cylinder unit 44 is connected to the main drive system of the rotary printing press 10 via a clutch mechanism (not shown). At this time, the other cylinder unit separated from the main drive system separates the blanket cylinder from the web W by an appropriate means such as an eccentric bearing, and a gap of several tens of millimeters is formed between the blanket cylinder and the surface of the web W. To form.

These A-plate cylinder unit 44 and B
It is preferable to provide an interlock mechanism mechanically, electrically, or in combination of both so that the plate cylinder unit 42 and the plate cylinder unit 42 are not simultaneously connected to the main drive system. Further, by providing each of the A-plate cylinder unit 44 and the B-plate cylinder unit with a small auxiliary drive means that can be operated independently, when one is printing, the other is replaced or brush-washed. Etc. can be performed. Further, by providing a partition at the boundary between the A plate cylinder unit 44 and the B plate cylinder unit 42, the A plate cylinder unit 44 and the B plate cylinder unit 42 are arranged close to each other. Even if there is, it is possible to prevent the ink mist during printing from affecting the other cylinder unit.

Further, as shown in FIG. 2B, the replacement printing unit 40 has a B plate cylinder unit 6 on the lower side.
4 is arranged, and the A-version cylinder unit 66 is arranged on the upper side.

The B plate cylinder unit 64 comprises one impression cylinder 67 and a pair of cylinder rows arranged with the B plate web W1 sandwiched between the impression cylinder 67. Each cylinder row includes a blanket cylinder 68 and a plate cylinder 70 that form a printing cylinder together with an impression cylinder 67, and further includes an inking roller group 74 that supplies ink. These paired cylinder rows are selectively switched by a clutch (not shown) and do not contact the B plate web W1 at the same time. Each cylinder row is individually driven by a driving unit such as a motor, and while printing is performed using one cylinder row, the other cylinder row in a free state can be replaced.

Similarly, the A version cylinder unit 66 is also
The first impression cylinder 77 and a pair of cylinder rows arranged with the web W2 for the A plate sandwiched between the impression cylinder 77.
Each cylinder row includes a blanket cylinder 78 and a plate cylinder 80 that form a printing cylinder together with an impression cylinder 77, and further includes an inking roller group 84 that supplies ink. These paired cylinder rows are selectively switched by a clutch (not shown) and do not contact the A version web W2 at the same time. Each cylinder row is individually driven by a driving unit such as a motor, and while printing is performed using one cylinder row, the other cylinder row in a free state can be replaced.

The A plate cylinder unit 66 is in a free state during printing of the B plate web W1. Conversely, B
The plate cylinder unit 64 is in a free state during printing of the A plate web W2. Therefore, during printing by this rotary printing press, only one cylinder row among the four cylinder rows prints, and the other three cylinder rows are in a free state.

Therefore, when printing is performed on the web W1 for B plate, for example, by the rotary printing press 10, the four printing units 38 are selected for their respective print sizes and the B plate cylinder unit 42 is connected to the main drive system. To do. Also,
If necessary, the replacement printing unit 40 also selects the B plate cylinder unit 64 and brings one of the two cylinder rows into contact with the B plate impression cylinder 67. The other cylinder row is equipped with the required plate.

When the replacement printing is switched during the printing of the B plate web W1, the cylinder row of the B plate cylinder unit 64 is switched to the other while the printing is continued. Then, the plate of the cylinder array separated from the impression cylinder 67 is changed to prepare for the next replacement printing.

Therefore, replacement printing can be performed only by switching the cylinder row of the B plate cylinder unit 64 without stopping the rotary printing press 10.

The same is true during printing of the A plate web W2. Further, during the printing of the B plate web W1, by changing the plates of the A plate cylinder units 44 and 66, the B plate web can be obtained. From W1 printing to A version web W2
It is also possible to perform the print switching to and the reverse switching without stopping the rotary printing press 10.

In the above embodiment, the case where each cylinder unit 42, 44, 64, 66 performs waterless printing has been described, but a dampening water supply roller group is provided for one or more required cylinder units or cylinder rows. An appropriate dampening water supply mechanism such as the above may be provided.

[0028]

As is apparent from the above, according to the rotary printing machine of the present invention, it is possible to print on various printing papers having different sizes with one rotary printing machine, and it is extremely easy to switch the print size. Therefore, the installation space can be small,
The printed matter can be efficiently produced, and the production cost can be reduced.

[Brief description of drawings]

FIG. 1 is a layout view schematically showing an entire rotary printing press according to an embodiment of the present invention.

FIG. 2 is a schematic layout diagram of a cylinder unit in a printing unit and a cylinder unit in a replacement printing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotary printing machine 12 ... Paper feeding part 14 ... Printing part 16 ... Drying part 18 ... Cooling part 20 ... Folding discharge part 38 ... Printing unit 40 ... Replacement printing unit 42, 64 ... B plate cylinder unit 44, 66 ... A Plate cylinder unit 46, 56, 68 ... Blanket cylinder 48, 58, 78 ... Plate cylinder 52, 62, 74, 84 ... Inking roller group 67, 77 ... Impression cylinder

Claims (1)

[Claims] 1. A rotary printing machine in which at least one printing unit is arranged in a running path of an object to be printed, each printing unit comprising a printing cylinder and an inking roller group for supplying ink to the printing cylinder. A rotary press, characterized in that it comprises at least two cylinder units having a different printing size of the respective printing cylinders, the printing medium being printed by one of these two selectively switched cylinder units. Printer.