JPH01316268A - Double-sided multicolor offset printing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a double-sided multicolor offset printing machine, and is intended to reduce machine stoppage time during blanket cleaning and the like.

<Prior art> In order to print the tint pattern on banknotes, for example, a double-sided multicolor offset printing machine 1 having a circular arrangement as shown in FIG. 2 is used.
be used. In this double-sided multicolor offset printing 811, a printing press main body 3° (the detailed structure will be described later) is disposed between the paper feeder 10 and the paper ejection device @20, and the paper feeder The paper that has been separated and fed is positioned by the registration device 40, passed through the printing press main body 30 while maintaining this positioning accuracy, and printed, and the printed paper is delivered to the delivery cylinder 21 of the paper discharge device 20 and The paper sheets are conveyed one by one by a chain gripper provided on the chain 22 and stacked on a paper stacking table.

In the printing press main body 30, a pair of blanket cylinders 31 and 32 are supported horizontally, and the peripheral surfaces of the blanket cylinders 31 and 32 are in contact with each other. Four plate cylinders 33 are arranged on the circumferential surface of the blanket cylinder 31, and four plate cylinders 34 are arranged on the circumferential surface of the blanket cylinder 32. The ink units 35 and 36 are movable so that they can approach and move away from the plate cylinders 33 and 34, and are in contact with the plate cylinders 33 and 34. ．． Ink and water are supplied to 34.

In this printing press main body 30, the blanket cylinder 32 does not have a paper pick-up device, but the blanket cylinder 31 is provided with a paper pick-up device. Therefore, the paper is fed along the path indicated by the curved arrow in the figure and is sent to the blanket cylinder 3.
It passes between 1 and 32 from above to below. During this passage, all the images collected from the plate cylinders 33, 34 to the blanket cylinders 31 and 32 are transferred to the paper by - times of pressure.

In such an offset printing machine 1, plate replacement/cleaning,
When preparing for printing such as registration, replacing and cleaning the blanket, stop all printing operations of the offset printing press 1, and then move the ink units 35, 36 backwards away from the plate cylinder 33, 34. Then, perform the necessary print preparation work described above.

<Problem to be Solved by the Invention> By the way, in order to ensure safety so as not to pinch the operator when moving the ink units 35 and 36, the moving speed of the ink units 35 and 36 is set extremely slow. are doing.

By the way, ink units 35 and 36 are plate cylinders 33 and 34.
It takes about 30 seconds to move from the state in contact with the plate cylinders 33 and 34 to the retract limit position, and conversely, it takes about 30 seconds to return from the retract limit position to the state in contact with the plate cylinders 33 and 34.

Of course, even when cleaning a slight stain on the blanket, it is necessary to stop the printing operation and move the inking units 35 and 36 as described above. Therefore, the printing operation had to be stopped every time printing preparation work such as washing was performed, and the printing operation rate decreased accordingly. In particular, it takes time to move the ink units 35 and 36, which is the main cause of a decrease in printing efficiency.

In view of the above-mentioned prior art, the present invention provides a double-sided multicolor offset printing machine that can shorten the time required for print preparation work.

<Means for Solving the Problems> The configuration of the present invention that solves the above problems is as follows: The blanket cylinder on the paper feeding device side and the blanket cylinder on the paper discharge device side are supported with their circumferential surfaces facing each other. In a double-sided multicolor offset printing machine in which printing is performed by feeding paper from above to below between the two blanket cylinders, the paper sent from the paper feeder is delivered to the blanket cylinder on the paper discharge device side. In addition to providing a paper transfer cylinder, a paper gripping device is provided on the blanket cylinder on the paper discharge device side, and a delivery cylinder of the paper discharge device is arranged below the blanket cylinder on the paper discharge device side. It is characterized by having an opening formed therein.

Example of implementation Embodiments of the present invention will be described in detail below based on the drawings.

Note that the same parts as those in the prior art are given the same numbers, and the explanation of the parts will be simplified.

FIG. 1 shows a double-sided multicolor offset printing press 100 according to an embodiment of the present invention. In the printing press main body 50 of this printing press 100, a blanket cylinder 51 without a paper gripping device and a blanket cylinder 52 equipped with a paper gripping device are supported horizontally, and the periphery of the blanket cylinder 51, 52 is supported horizontally. The surfaces are in contact. And rubber body 5
Four plate cylinders 53 are arranged on the circumference of the blanket cylinder 52, and four plate cylinders 54 are arranged on the circumference of the blanket cylinder 52. The ink units 55 and 56 are movable so as to approach and move away from the plate cylinders 53 and 54, and supply ink and water to the plate cylinders 53 and 54 while in contact with the plate cylinders 53 and 54.

Further, the delivery cylinder 21 of the sheet discharging device 20 is arranged below the blanket cylinder 52, and the chain 22 is placed to the left of the delivery cylinder 21 without crossing the space below the position where the peripheral surfaces of the blanket cylinders 51 and 52 are in contact with each other. It will be placed in It also has a paper holding device, and includes paper transfer cylinders 57 and 58 that transfer paper from the registering device 40 to the blanket cylinder 52. The paper delivery trunk 59 is a mercenary who hands the paper to the person. Therefore, the paper fed from the paper feeding device 10 and positioned by the registering device 40 follows the paths shown by the curved arrows in the figure, that is, the paper transfer cylinders 57 and 58 → the blanket cylinder 52 → the paper transfer cylinder 59 → the delivery cylinder 21. Printing is performed when the paper is fed along the circumferential surface and passes between the blanket cylinders 51 and 52 from above to below.

Furthermore, an opening 60 is formed below the rubber cylinders 51 and 52. In this printing machine main body 50, unlike the conventional one, the chain 22 does not cross the lower space where the peripheral surfaces of the blanket cylinders 51 and 52 are in contact with each other, so the operator can enter the lower space through the opening 60. can enter.

In such an offset printing press 100, when performing a simple task of cleaning the blanket, the blanket cylinder 51.
Although it is necessary to stop the printing operation such as rotation of the printing cylinders 51 and 52, the ink units 55 and 56 are kept in contact with the plate cylinders 53 and 54 through the opening 60.
A worker can enter the space below 2 and wash the blanket. Therefore, the process of moving the ink units 55, 56, which takes a long time, is no longer necessary, so that the printing stop time can be shortened and the printing operation rate can be improved.

Further, since the adjustment work of the delivery cylinder 21 (movement of the paper guide) can be easily performed through the opening 60, printing failures such as stains and blurring due to poor adjustment of the delivery cylinder 21 are reduced.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, there is no need to move the ink unit during blanket cleaning, so cleaning can be done in a short time.

As a result, the downtime is reduced by 81% and the printing operation rate is increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a double-sided multicolor offset printing machine according to the present invention, and FIG. 2 is a block diagram showing a conventional double-sided multicolor offset printing machine. In the drawing, 10 is a paper feed device, 20 is a paper discharge device, 21 is a delivery cylinder, 50 is a printing press main body, 51.52 is a blanket cylinder, 53.54 is a plate cylinder, 55.56 is an ink unit, 57. Reference numerals 58 and 59 are paper transfer cylinders, and 60 is an opening.

Claims (1)

[Scope of Claims] A blanket cylinder on the paper feeding device side and a blanket cylinder on the paper discharging device side are supported with their circumferential surfaces facing each other, and between the two blanket cylinders, paper is transferred from above to below. A double-sided multicolor offset printing machine that performs printing by being fed toward the paper feeder is equipped with a paper transfer cylinder that transfers the paper fed from the paper feeder to a blanket cylinder on the paper output device side, and a paper transfer cylinder that transfers the paper fed from the paper feeder to the rubber cylinder on the paper output device side. double-sided multicolor offset printing characterized in that a paper gripping device is provided in the paper-sucking device, a delivery cylinder of the paper-discharging device is disposed below a blanket cylinder on the paper-discharging device side, and an opening is formed below the blanket cylinder. Machine.