JPH06293124A - Sheet-fed gravure printing press - Google Patents

Abstract

PURPOSE:To provide a sheet-fed gravure printing press capable of smoothly applying various varnishes such as magnetic ink. CONSTITUTION:A printing press is equipped with a plate cylinder 7, an impression cylinder 8 and a slackening preventing press roller 11 pressing a material to be printed to the impression cylinder 8. The peripheral speed of the plate cylinder 7 is made variable with respect to that of the impression cylinder 8. When the peripheral speed of the plate cylinder 7 is altered with respect to that of the impression cylinder 8 in such a state that the material to be printed is pressed to the impression cylinder 8 by the press roller 11, the plate cylinder 7 slips with respect to the material to be printed and the fine printing irregularity peculiar to gravure printing is leveled to smooth a printed surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed gravure printing machine.

[0002]

2. Description of the Related Art Conventionally, as a sheet-fed gravure printing machine, a printing apparatus having a plate cylinder, an impression cylinder, an ink supply device and a doctor device, and a sheet-fed sheet or other sheet-to-be-printed material are supplied to the printing apparatus one by one. 2. Description of the Related Art There is known a device including a paper feeding device for printing and a paper discharging device for sending out a printed matter.

[0003]

The sheet-fed gravure printing machine may be used for applying magnetic ink or the like to plastic cards such as prepaid cards in addition to ordinary gravure printing. In the sheet-fed gravure printing machine, due to minute printing unevenness peculiar to gravure printing that occurs when ink is transferred from the intaglio portion formed by the screen mesh, the card surface cannot be smoothed, so misreading occurs when reading the card There was such a problem.

In order to enable smooth printing without unevenness,
The reverse coating method is sometimes used, which is successful in the roll printing method, but in the sheet-fed method, there is a problem that a thin coating uneven line parallel to the roll occurs. Further, although silk screen printing enables smooth coating, it has a problem of poor practicability because ink having a high drying property cannot be used.

An object of the present invention is to provide a sheet-fed gravure printing machine which can smoothly apply various varnishes such as magnetic ink.

[0006]

SUMMARY OF THE INVENTION A sheet-fed gravure printing machine according to the present invention includes a printing apparatus having a plate cylinder, an impression cylinder, an ink supply unit and a doctor unit, and a sheet-shaped substrate such as a sheet. In a sheet-fed gravure printing machine equipped with a paper feeding device that feeds a printing device and a paper discharge device that sends out a printed material after printing, a slack prevention presser roller that contacts the impression cylinder and presses the printed material against the impression cylinder. However, it is characterized in that it is provided in front of the position where the impression cylinder comes into contact with the plate cylinder, and the peripheral speed of the plate cylinder is variable with respect to the peripheral speed of the impression cylinder.

[0007]

According to the sheet-fed gravure printing machine of the present invention, when the peripheral speed of the plate cylinder is changed with respect to the peripheral speed of the impression cylinder in a state where the object to be printed is pressed against the impression cylinder by the pressing roller, As a result, the plate cylinder slides, and the fine printing unevenness peculiar to gravure printing is smoothed and the printing surface becomes smooth.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left-right direction and the rotation direction are shown in FIG.
Shall be the standard.

The sheet-fed gravure printing machine shown in FIGS. 1 to 3 includes a printing device (1) and a paper tray (2) for accommodating a large number of sheet-to-be-printed objects such as plastic cards and sheets.
And the printing device (1) one by one for the printed material from the paper stand (2)
A paper feeding device (3) for feeding the printed matter, a paper discharging device (4) for feeding the printed material by an endless chain with nails (6),
It is composed of a paper tray (5) for stacking printed matter sent by the paper discharge device (4).

The printing device (1) is a gravure engraving plate cylinder capable of rotating both clockwise and counterclockwise.
(7), impression cylinder that contacts the plate cylinder (7) and rotates counterclockwise
(8), ink supply device (9), doctor device (10), impression cylinder (8)
The presser roller (11) for preventing slack that comes into contact with the impression cylinder (8) and presses the substrate against the impression cylinder (8) at a position slightly clockwise from the position where it contacts the plate cylinder (7), not shown. Equipped with a drying device and register device, in addition to normal gravure printing, smooth printing that can smooth out by smoothing the fine printing unevenness peculiar to gravure printing formed by the white line screen and ink layer is possible. Is. Smooth printing is used when applying magnetic ink or heat-sensitive ink to plastic cards such as prepaid cards, or when applying UV-curable clear varnish, metal powder ink, water-based varnish, etc. to cardboard, etc. To be done.

The plate cylinder (7) is driven by the plate cylinder motor (12), the impression cylinder (8) is driven by the impression cylinder motor (13), and the encoder cylinder (14) is connected to the impression cylinder motor (13). ing. The plate cylinder motor (12), the impression cylinder motor (13) and the encoder (14) are connected to the control device (15).

The paper feeding device (3) has a swing claw (16), which swings to feed the material to be printed to the impression cylinder (8). The impression cylinder (8) is provided with an impression cylinder claw (17) for holding and stably holding the printing material sent by the swing claw (16).

The ink supply device (9) is located below the plate cylinder (7) and can move up and down.
The plate cylinder (7) is provided on the upper left side of the plate cylinder with a dripping nozzle (19) for dripping ink, and the ink is supplied by either an immersion type or a dripping type.

The doctor device (10) includes a doctor blade (2
0) and a doctor holder (21) for supporting this. The doctor blade (20) is tilted slightly to the lower right and is applied to the plate cylinder (7) from the left. The doctor holder (21) can be rotated, and the angle of the doctor blade (20) can be adjusted by rotating it.

In the printing apparatus (1) having the above structure, the plate cylinder
The rotation direction of (7) and the peripheral speed of the plate cylinder (7) with respect to the peripheral speed of the impression cylinder (8) can be changed.

1 and 2 show the case where the plate cylinder (7) rotates clockwise, that is, the peripheral speed of the impression cylinder (8) and the peripheral speed of the plate cylinder (7) are in the same direction. ing.

When the peripheral speeds of the impression cylinder (8) and the plate cylinder (7) are the same, the ink supply is of the immersion type. That is,
Ink is placed in the ink pan (18), the ink pan (18) is positioned on the upper side, and part of the plate cylinder (7) is moved to the ink pan (18).
After being soaked in the ink, and the excess ink was scraped off by the doctor blade (20), the ink application part of the plate cylinder (7) was
It is held down to.

When the peripheral speeds of the impression cylinder (8) and the plate cylinder (7) are the same, the ratio between the peripheral speed of the impression cylinder (8) and the peripheral speed of the plate cylinder (7) is from 1: 1 to 1: 1. You can change up to 3.

When performing normal gravure printing, the impression cylinder
(8) and plate cylinder (7) have the same peripheral speed direction and plate cylinder (7)
The ratio of the peripheral speed of the cylinder to the peripheral speed of the impression cylinder (8) is 1: 1.

When performing smooth printing, the peripheral speeds of the impression cylinder (8) and the plate cylinder (7) are the same, and the peripheral speed of the plate cylinder (7) is higher than that of the impression cylinder (8). Be made bigger. When the peripheral speed of the plate cylinder (7) is different from the peripheral speed of the impression cylinder (8) while the press roller (11) presses the print object against the impression cylinder (8), the print object ( The plate cylinder (7) is pressed against the plate (8) and rotates together with the impression cylinder (8) without sagging, which causes the plate cylinder (7) to slide against the material to be printed, thereby smoothing out the fine print unevenness peculiar to gravure printing. The printed surface becomes smooth.

Smooth printing is possible even when the plate cylinder (7) rotates counterclockwise, that is, when the peripheral speed of the impression cylinder (8) and the peripheral speed of the plate cylinder (7) are opposite. is there. FIG. 3 shows this case. The ratio of the peripheral speed of the impression cylinder (8) and that of the plate cylinder (7) is 1
You can change from 0.5 to 1: 2.

When the peripheral speed of the impression cylinder (8) and the peripheral speed of the plate cylinder (7) are opposite to each other, the ink supply is of the drop type. That is, ink is fed from the nozzle on the upper left side of the plate cylinder (7) to the plate cylinder (7).
After the excess ink is scraped off by the doctor blade (20), the ink application part of the plate cylinder (7) is removed from the impression cylinder (8).
It is held down to. Excess ink is received and collected by the ink pan (18) below the plate cylinder (7) located on the lower side.

Pressing roller (11) presses the material to be printed (8)
If the peripheral speed of the plate cylinder (7) and the peripheral speed of the impression cylinder (8) are reversed in the state of being held against the impression cylinder, the material to be printed is pressed against the impression cylinder (8) and does not sag. It rotates together with (8),
The plate cylinder (7) slides on the material to be printed, and fine printing unevenness peculiar to gravure printing is smoothed and the printing surface becomes smooth. As a result, a high-viscosity liquid, an ultraviolet curable varnish or the like can be applied smoothly.

[0024]

EFFECTS OF THE INVENTION According to the sheet-fed gravure printing machine of the present invention, the printing surface becomes smooth. Therefore, by coating various functional inks on a plastic card such as a prepaid card, misreading during card reading can be prevented. Also, it can be used as a substitute for a film laminate by applying a smooth coating to a printed matter which is formed into a sheet and offset-printed.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a sheet-fed gravure printing machine according to the present invention.

FIG. 2 is an enlarged view of a main part when the plate cylinder is rotated clockwise.

FIG. 3 is an enlarged view of a main part when the plate cylinder is rotated counterclockwise.

[Explanation of symbols]

 (1) Printing device (3) Paper feeding device (4) Paper ejection device (7) Plate cylinder (8) Impression cylinder (9) Ink supply device (10) Doctor device (11) Sag prevention presser roller

Claims (1)

[Claims] 1. A printing device having a plate cylinder, an impression cylinder, an ink supply device and a doctor device, a paper feeding device for feeding sheet-to-be-printed materials such as sheets to the printing device one by one, and printing is completed. In a sheet-fed gravure printing machine equipped with a paper discharge device that sends out a material to be printed, a slack prevention presser roller that contacts the impression cylinder and presses the material to the impression cylinder is provided in front of the position where the impression cylinder contacts the plate cylinder. A sheet-fed gravure printing machine characterized in that the peripheral speed of the plate cylinder is variable with respect to the peripheral speed of the impression cylinder.