JPH0224666B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink supply device in a printing press for uniformly supplying ink to a printing plate mounted on a plate cylinder of a printing press by an ink forming roller, and in particular to The present invention relates to an improvement in an ink supply device equipped with an ink leveling horizontal vibrating roller for making ink uniform on an ink applicator roller that adheres ink while rotating.

When supplying ink to a printing plate using an ink form roller of a printing press ink supply device, the ink supplied onto the ink form roller during printing operation of the printing machine is transferred by contact rotation with the printing plate. It adheres only to the image area of the printing plate. The thickness of the ink film (residual film) that is left on the ink form roller when it rotates in contact with the printing plate is determined by the thickness of the ink form roller that contacts the non-image area of the printing plate to which ink does not adhere, and the area of the ink form roller that contacts and corresponds to the non-image area of the printing plate to which ink does not adhere. A clear difference in ink film thickness occurs between the ink forming roller portion that comes into contact with the line portion and the shape corresponds to the print line shape. In this way, a difference occurs in the amount of ink remaining on the ink forming roller in the printing width direction after ink is supplied, and the difference in ink film thickness appears as a difference in the amount of ink supplied to the printing plate. The difference in the ink film thickness on the ink form roller after ink supply cannot be resolved by simply supplying new ink one after another onto the rotating roller, and the difference in ink film thickness on the ink forming roller after ink supply cannot be resolved by simply supplying new ink one after another onto the rotating roller. The applicator roller supplies ink to the printing plate while exhibiting deviations in ink film thickness. As a result, a sharp difference in ink shading occurs in the printed matter, especially in the solid image area.

Therefore, ink supply in a conventional printing press is carried out by horizontally rotating the ink forming rollers 5 while contacting them with the horizontally vibrating rollers V1 and V2, as shown in FIG. A mechanism is provided which operates to equalize the supply. This lateral vibration mechanism eliminates the above-mentioned difference in ink density (generally referred to as a ghost phenomenon). In order to obtain this effect well, it is necessary to adjust the lateral vibration rollers V1 and V2 to an appropriate lateral vibration state according to the area and shape of the image area on the printing plate (deviation of the image area). Therefore, it is necessary to make the ink film thickness on the ink forming roller 5 uniform.

However, conventional lateral vibration rollers are mechanically linked to the rotation period of the plate cylinder in the main body of the printing press, and it is not easy to adjust only the lateral vibration roller independently regardless of the rotation of the plate cylinder. I couldn't.

An object of the present invention is to uniformize ink supply to a printing plate in order to eliminate the difference in shading that occurs in the printing width direction of printed matter.

The present invention comprises an ink forming roller 5 that rotates in contact with a plate cylinder 1 of a printing press, and a transverse vibrating roller for ink leveling that rotates while contacting the roller while swinging parallel to the axial direction of the roller. and
In a printing press ink supply device that supplies ink from the ink form roller 5 to the plate cylinder 1 side via the oscillating roller, the ink form roller 5 is rotatable in contact with the ink form roller 5, and the printing machine main body such as the plate cylinder 1 is rotated during printing. A variable lateral oscillation roller 6 is provided which can be set to a lateral oscillation period with an appropriate oscillation speed and oscillation width independently of the period, and the variable oscillation roller 6 is detachable from the ink form roller 5 and the nip pressure can be adjusted. This is a printing press ink supply device characterized in that it is provided in a printing press.

Next, the present invention will be explained in detail with reference to FIG. 2, which is a perspective view of an embodiment of the apparatus of the present invention. A variable transverse vibration roller 6 is provided which rotates in contact with the ink forming roller 5. The variable oscillation roller 6 operates at a oscillation period independent of the rotations of the plate cylinder 1, blanket cylinder 2, and impression cylinder 3 of the printing press main body. The ink applicator roller 5 supplies ink on the printing plate provided on the circumferential surface of the plate cylinder 1 while rotating in contact with the printing plate.

The variable lateral vibration roller 6 is an independent variable lateral vibration mechanism that can set a lateral vibration operation with an appropriate swing speed and width regardless of the rotation of the plate cylinder 1 of the printing press main body;
It is equipped with a pressure adjustment mechanism that enables attachment/detachment to the ink forming roller 5 and adjustment of the nip pressure.

Regarding the independent variable lateral vibration mechanism, the variable lateral vibration roller 6 freely rotates with respect to a support shaft 19, and the support shafts 19 at both ends of the roller 6 each have a shaft mounted on a bracket 15 that can freely rotate in forward and reverse directions. It is attached to an eccentric position of the circular metal bearing part 17 so as to be slidable in the axial direction with respect to the bearing part 17. A roller 16 is integrally provided at one end of the support shaft 19. The roller 16 is slidably fitted into the elongated hole of the guide arm 14, and the roller 16 at one end of the support shaft 19 can slide along the elongated hole of the guide arm 14.

On the other hand, the guide arm 14 and the actuating arm 12 are
Since it is supported by a bearing 13 with the shaft 9 as a fulcrum, the variable lateral vibration roller 6 performs a lateral vibration operation due to the repeated movement of the arm 12. For the repetitive motion of the arm 12, a crank plate 8 attached to one end of a transmission shaft 7 of a variable speed changer is driven and rotated by, for example, a servomotor 10 with an encoder or a rotation of the driving side of the printing press main body. One end of the crankshaft 11 is connected to the other end of the crank plate 8, and the crankshaft 11 is repeatedly operated, and the arm 12 connected to the other end of the crankshaft 11 is repeatedly operated via the fulcrum of the shaft 9. It is something that makes you The variable lateral oscillation roller 6 operates independently of the rotational drive of the printing press main body, such as the printing plate cylinder 1, blanket cylinder 2, impression cylinder 3, and ink forming roller 5, during rotation of the printing press main body. However, the period of repeated lateral oscillation of the variable oscillating roller 6 in the direction of the support shaft 19 is determined by the output rotation speed of the motor 10. Further, the swing width is determined by the distance between the mounting positions of the transmission shaft 7 and the crankshaft 11, which are mounted on the rotating crank plate 8.
You can set it by sliding it on the top and fixing it in the appropriate spaced position. Next, regarding the pressure adjustment mechanism of the variable oscillating roller 6 against the ink forming roller 5, a perfect circular metal bearing portion 1 which is rotatable in forward and reverse directions is attached to the bracket 15 that supports the variable lateral oscillating roller.
By rotating 7 in either the forward or reverse direction, the variable oscillating roller 6, which is pivotally supported at an eccentric position of the bearing portion 17, can be moved away from or pressed against the ink form roller 5, The strength of the nip pressure can be adjusted.

FIG. 3 shows another embodiment of the present invention, in which a plurality of variable transverse rollers 6 rotate transversely while contacting the rotating ink form roller 5 in parallel with the existing transverse rollers V1 and V2. The variable lateral vibration mechanism and the pressure adjustment mechanism are provided at one end of the support shaft 19 of each of the variable lateral vibration rollers 6 to enable lateral vibration operation with appropriate swing speed and width.

In the present invention, the variable lateral oscillating roller 6, which oscillates in contact with the ink form roller 5, is independent of the plate cylinder rotation phase of the printing press, and also, for example, the oscillating speed and amplitude of the existing lateral oscillating rollers V1 and V2. It can be adjusted to the necessary swing speed and swing width independently of the ink forming roller 5, and can prevent uneven ink film thickness on the ink form roller 5 that occurs due to difficulties in supplying ink to the printing plate during printing operation. , it is possible to make it uniform as appropriate.

In the present invention, the variable oscillating rollers 6 can each be individually adjusted to an appropriate oscillating speed and amplitude, so the oscillating phase with respect to the oscillating rollers V1 and V2 that are already installed in the printing press body is adjusted, and the ink is formed. It is possible to uniformly spread the ink film that is offset in the width direction on the roller 5,
Furthermore, by increasing the swing width of the variable oscillating roller 6, the ink film progresses in the direction of further expansion, and by increasing the oscillating speed of the variable lateral oscillating roller 6, the ink film is expanded in the printing width direction and the printing rotation direction. It is possible to make the ink film more uniform.

(Effects of the Invention) The present invention provides an ink supply device of a printing press with a variable transverse vibration roller that can be independently adjusted to an appropriate swing speed and width with respect to the rotation period of the printing press main body, and a plate of the printing press main body. The rotation period of the drum, the bracket cylinder, and the impression cylinder, and the lateral oscillation period of the variable lateral oscillation roller relative to the oscillation period of the existing lateral oscillation roller that performs lateral oscillation in conjunction with each of them can be adjusted as appropriate. For example, even during printing operation, the amount of ink supplied varies depending on the image distribution state of the printing plate in the printing width direction and the printing direction on the ink forming roller that rotates in contact with the variable oscillation roller. In addition, it is possible to easily adjust and equalize the density unevenness caused by deviations in the amount of ink supplied to the printed matter that is printed and discharged, and to reduce the difference in the amount of ink supplied to the printing plate. It is possible to exhibit extremely remarkable effects such as being able to remove uneven print shading differences that occur on printed matter and improve the quality of printed matter.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional printing press ink supply device, FIG. 2 is a perspective view of the printing press ink supply device of the present invention, and FIG. 3 is a side view of another embodiment of the ink supply device of the present invention. 1...Printing plate cylinder, 2...Blanket cylinder, 3...
... Impression cylinder, 4 ... Printing paper, 5 ... Ink formation roller, V1, V2 ... Lateral vibration roller, 6 ... Variable horizontal vibration roller, 17 ... Eccentric metal bearing, 18 ...
Mounting screw, 20... Dampening water device, 21... Printing machine body frame.

Claims (1)

[Claims] 1 Equipped with an ink forming roller 5 that rotates in contact with the plate cylinder 1 of a printing press, and a lateral vibrating roller for ink mixing and leveling that rotates while contacting the roller while swinging parallel to the axial direction of the roller. , from the inking roller 5 to the plate cylinder 1 via the oscillating roller.
In a printing press ink supply device that supplies ink to the side, the ink forming roller 5 can be rotated in contact with the ink forming roller 5, and the swing speed and width can be adjusted independently of the printing rotation period of the printing press main body such as the plate cylinder 1. An ink supply device for a printing press, characterized in that a variable lateral oscillation roller 6 whose oscillation period can be set is provided, and the variable lateral oscillation roller 6 is provided so as to be detachable from the ink forming roller 5 and to be able to adjust the nip pressure.