DE102006044985A1 - Ink dosing system for printing machines comprises ink feed and doctor blade, central angle of blade with respect to anilox roller being adjustable during operation or when the roller is stationary - Google Patents

Abstract

The ink dosing system (1) for printing machines comprises an ink feed (2) and a doctor blade (3). The central angle of the blade with respect to the anilox roller (4) can be adjusted during operation or when the roller is stationary.

Description

The The invention relates to a device for metering printing ink in a printing machine, which has a squeegee device with a color supply and contains a squeegee and wherein the squeegee device is associated with an anilox roller.

One Widely used case is the ink supply of an anilox roller by a chambered doctor blade, as is customary, for example, in short inking units. The anilox roller is in operative connection with an inking roller, which transfers the ink to a plate cylinder.

From the DE 102 03 695 A1 a paint container is known which rests against an anilox roller and has a doctor blade and a displacement body. By adjusting the displacer, the color level (color level) of the ink is set in the paint container. The set color level determines the size of the contact surface between ink and anilox roller. If the contact area between printing ink and anilox roller is increased, the color density of the printed product increases. It can thus be metered on the ink level on the ink. With this device, however, high-viscosity inks can be dosed worse.

Of the Invention is therefore based on the object, a device for To provide metering of ink with wider scope.

According to the invention Task by a device having the features of the first claim solved.

The Invention is intended to an embodiment be explained in more detail. The Associated FIG. 1 shows the schematic representation of an anilox roller with an employee Doctor device.

As can be seen from the figure, there is the squeegee device 1 from one to the anilox roller 4 employed squeegee 3 and a color supply 2 , The squeegee device 1 is in each central angle position to the anilox roller 4 adjustable. In this case, a central angle position which is between 30 ° and 120 ° is preferred. Since it is common in printing press to name such positions in analogy to the dial of a clock, this terminology is applied below. Thus, the preferred position is a position between the 11 o'clock position and the 8 o'clock position.

As shown in the figure, the anilox roller stands 4 with an inking roller 8th in active connection. This is used for coloring a pressure plate mounted on a printing plate (not shown here).

The anilox roller 4 is rotationally driven in only one direction by a separate drive (not shown). This excludes a drive in the other direction. One of the squeegee 3 spaced and oppositely inclined closing squeegee is not required for this reason. The lateral surface of the anilox roller 4 moves according to the arrow, as shown in the figure.

In another version The invention can be an anilox roller drive with reversal of direction be used, which then requires the application of a chambered doctor blade power.

The color supply 2 the squeegee device 1 consists of highly viscous ink and has a color level 5 on. Due to the high speed of the anilox roller 4 it comes when touching the ink with the lateral surface of the anilox roller 4 for unrolling the printing ink on the lateral surface. It creates a color role 7 in the opposite direction to the anilox roller 4 rotates. This paint roller 7 forms from an approx. 9 o'clock position of the doctor device 1 out. As can be seen from the figure, the squeegee 3 at an angle α to the tangent of the lateral surface of the anilox roller 4 employed (see figure). This angle of attack α remains constant during operation. In another embodiment of the invention, however, the angle of attack α can be changed during operation.

In the 8 o'clock position of the squeegee device 1 falls due to geometric conditions, the color level 5 of the color stock 2 under the line of contact 6 , being under contact line 6 the contact line of the squeegee 3 with the lateral surface of the doctor roller 4 to understand. This position serves as insertion and removal position for the doctor device 1 or for the color supply 2 , In addition to this insertion and removal position, the device is still in at least two operating positions or central angle positions of the doctor device 1 operated.

For operation of the device according to the invention: During operation or even at a standstill, it is possible, the central angle position of the doctor device 1 for Ras terwalze 4 to change. The squeegee device 1 can in any Zentriwinkel position to the anilox roller 4 be fixed. Depending on the central angle position of the doctor device 1 acts a different size weight component of the paint roller 7 on the anilox roller 4 , The weight component increasing from the 8 o'clock position to the 11 o'clock position causes more contact of the paint roller 7 to the lateral surface of the anilox roller 4 , The stronger contact means on the one hand a larger contact surface by a change in shape of the paint roller 7 , which assumes a rather elliptical shape, and on the other hand, a greater force, the paint roller 7 stronger to the anilox roller 4 suppressed. The stronger contact causes the wells of the anilox roller 4 be filled with more ink. This results in a minimum contact in the 9 o'clock position and a near maximum contact between the paint roller in the 11 o'clock position 7 and lateral surface of the anilox roller 4 occurs. Depending on the given conditions, a central angle maximum position was selected (in the exemplary embodiment, the 11 o'clock position shown), which guarantees that when the anilox roll stops 4 the color level 5 the broadly flowing ink is not above the top vertex of the anilox roll 4 lies. Since, as stated above, the printed color density with increasing contact between ink and lateral surface of the anilox roller 4 increases, can about the Zentriwinkel position of the doctor device 1 the ink on the printed product can be easily dosed.

1

doctor device

2

color stock

3

doctor

4

anilox roller

5

color level

6

contact line

7

paint roller

8th

Inking roller

α

angle of attack

Claims (13)

Device for metering printing ink in a printing machine, which comprises a doctor device ( 1 ) with a color supply ( 2 ) and a squeegee ( 3 ) and the squeegee device ( 1 ) an anilox roller ( 4 ), characterized in that the doctor device ( 1 ) during operation or at standstill in selectable central angle positions to the anilox roller ( 4 ) is adjustable. Apparatus according to claim 1, characterized in that the doctor device ( 1 ) in addition to a central angle position for removal and for insertion into at least two further central angle positions relative to the anilox roller ( 4 ) is adjustable. Apparatus according to claim 1, characterized in that the angle of attack (α) of the doctor blade ( 3 ) to the lateral surface of the anilox roller ( 4 ) remains constant in each central angle position. Apparatus according to claim 1, characterized in that the doctor device ( 1 ) within a central angle range on the anilox roller ( 4 ), which extends from below the upper vertex of the anilox roller ( 4 ) to above the lower vertex of the anilox roller ( 4 ). Apparatus according to claim 4, characterized in that the doctor device ( 1 ) within a central angle range on the anilox roller ( 4 ), which, in analogy to the dial of a clock, lies between the 8 o'clock position and the 11 o'clock position. Apparatus according to claim 1, characterized in that the doctor device ( 1 ) in any central angle position to the anilox roller ( 4 ) is fixable. Apparatus according to claim 1, characterized in that the color supply ( 2 ) a color level ( 5 ) which is in the 8 o'clock position of the doctor device ( 1 ) below the contact line ( 6 ) the squeegee ( 3 ) with the lateral surface of the anilox roller ( 4 ) lies. Device according to one of the preceding claims, characterized in that between the color level ( 5 ) and the contact surface of the ink is a geometric relationship, such that at the same color amount of the ink supply ( 2 ) during the displacement of the doctor device ( 1 ) from the 8 o'clock position to the 11 o'clock position the color level ( 5 ) in the doctor device ( 1 ) and thus the contact surface of the ink to the anilox roller ( 4 ) increases. Apparatus according to claim 1 or 8, characterized in that the minimum color level ( 5 ) of the color supply ( 2 ) during operation above the contact line ( 6 ) lies. Apparatus according to claim 1, characterized in that the anilox roller ( 4 ) has its own drive, through which the anilox roller ( 4 ) is rotationally driven in only one direction. Apparatus according to claim 10, characterized in that the anilox roller ( 4 ) rotates counterclockwise. Apparatus according to claim 1, characterized in that during operation, the printing ink in contact with the lateral surface of the rotating anilox roller ( 4 ) as a rotating paint roller ( 7 ) is trained. Apparatus according to claim 1, characterized in that the color amount of the ink supply ( 2 ) is kept constant.