EP0946368A2

EP0946368A2 - Ink fountain

Info

Publication number: EP0946368A2
Application number: EP97954705A
Authority: EP
Inventors: Karl Robert SCHÄFER
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 1996-12-21
Filing date: 1997-12-22
Publication date: 1999-10-06
Anticipated expiration: 2017-12-22
Also published as: WO1998028136A2; JP3187063B2; JP2000505748A; EP0946368B1; DE59703081D1; US6276275B1; WO1998028136A3

Abstract

In a method for determining the density (d1-d4) of an inking cylinder (12) which is formed in the ink fountain (1) of a rotary press, the density of one or several locations is detected directly or indirectly. The measuring values thus obtained are converted into electric signals which can be evaluated. A signal is generated to the ink feed or a warning signal is transmitted according to the extent and direction of deviation. The invention also relates to other devices involved in said method.

Description

Paint box

The invention relates to a method for determining the presence of a paint roller in an unpressurized ink fountain of a rotary printing press according to the preamble of claim 1 and several associated egg nich directions.

EP 06 63 293 A1 discloses a device for inking an anilox roller, in which printing ink rotates about a longitudinal axis running parallel to the anilox roller in a fully filled ink chamber with a circular cross section.

A negative squeegee and a positive squeegee are provided.

The invention has for its object to provide a method and a device with which it can be determined whether NEN run during the Maschi in a paint box a paint roller bi Idet.

According to the invention, this object is achieved by the features of claims 1, 7 and 13.

The advantages that can be achieved with the invention are, in particular, that the thickness of the during Machine roller forming color roll determined continuously or at intervals and an electrical, optical and / or acoustic signal is output in the event of a deviation from a target value. Depending on the amount and the direction of the deviation, either a signal for controlling the ink supply or a warning signal for the operating personnel is issued.

Several exemplary embodiments of the invention are shown in the drawing and are described in more detail below.

Show it :

Fig. 1 is a schematic representation of a

Cross section through an ink fountain placed on a roller with a device in two positions and the optional arrangement of further devices;

Fig. 2 further embodiment variants of devices to 9 for performing the method.

An open (unpressurized) ink fountain 1 has left and right side walls 2; 3 and two sealing end walls 6 adapted to the periphery 21 of a driven roller 4; 7. The ink fountain 1 extends over the entire length of the roller 4, the z. B. can be designed as an anilox roller or as a Ti ef Druckzy l i nde r. Below on the side walls 2; 3, a working squeegee 8 and a closing squeegee 9 are interchangeably attached.

Instead of squeegees 8; 9 could also be arranged along the length of the roller 4 individually next to each other be used.

In the ink fountain 1 there is preferably highly viscous printing ink 11 (greater than 60 poise), which during masc h nen l on e s according to the direction of rotation of the roller 4, z. B. counterclockwise A forms on the left inside 17 of the side wall 2 and the inside width b and length of the squeegee 8 ink roller 12 forms. The squeegee edge of the squeegee 8 scrapes off printing ink from the surface 21 of the roller 4.

The rotating ink roller 12 has a desired thickness d1 at a specific point in its length, which is proportional to the printing ink used up and refilled from the ink fountain 1. By means of a directly or indirectly directed to the paint roller 12, a narrow, fixed or fixed device 28 is measured continuously or at adjustable intervals and the result of the measurement is evaluated.

A distance measurement is carried out either by means of optical or acoustic means, e.g. B. laser beams or ultrasound, which are emitted by the device 28 and directly and without touching the surface 21 of the ink roller 12. The thickness d1 of the ink roller 12 is then determined on the basis of the known distance between the surface of the roller 4 and the device 28. As a result of the delivery of printing ink 11 while the machine is running, a paint roller 32 with a reduced thickness d2 forms - dashed line illustration -. Thereupon, the device 28 emits a signal which sets in motion a non-indicated ink pump which supplies the ink fountain 1 with new printing ink via the ink inlet 27.

In the event of a large negative deviation d3 or large positive deviation d4 of the thickness of the ink roller 33; 34 - dashed line - an optical and / or acoustic warning signal is issued, which warns the operating personnel of an error in the inking unit.

The device 28 is connected by means of an electrical or optical line 29 to the Masc h i nen line. By means of a preselection 30; 31, the time to be measured 11 and the fixed distance value can be set.

The device 28 can, as shown in dashed lines in the drawing, be arranged so as to protrude beyond the upper edge 38 of the ink fountain 1. It is also possible to provide measurements with the device operating on a capacitive basis.

Furthermore, the device 28 can also be fastened along the ink fountain 1 on a roller parallel The guide rail can be moved manually or by a motor.

According to another example, a paint roller feeler lever 23 is articulated on a bearing 18 fastened to the inside 17 of the left side wall 2, the underside 36 of which rests tangentially on the periphery 21 of the paint roller 12. Thus, a distance between the top 37 of the paint roller feeler lever 23 and the device 28 is measured indirectly and with contact, so that taking into account the material thickness of the paint roller feeler lever 23, the different thicknesses d1 to d4 of the paint rollers 12; 32; 33; 34 have it determined.

After a third example, the

Fa rbro l l en- Füh Ihebe l 23 be designed as a two-armed feeler lever 16, the second arm 22 in the direction

Opening of the ink fountain 1 points and at an angle

Alpha, e.g. B. from 130 ° to 140 ° with the first arm 23 in

Camp 18 converges. A device arranged on the upper edge 38 of the right side wall 3

39 - shown in dashed lines - measures a horizontal

Distance between device 39 and the

Front 41 and the second arm 22 in turn in an indirect and contact manner while the

Bottom 36 of the first arm 23 abuts the periphery 21 of the paint roller 12.

Depending on the thickness d1 to d4 of the paint roller 12; 32; 33; 34 changes the position of the two-armed feeler lever 16, so that the device 39; 16 determines the thickness of the paint roller. The device 39 can be designed in the same way as the device 28.

After a fourth embodiment, the two-armed feeler lever 16 at the end of its second arm 22 has a lug 24, which, for. B. with an inductive device 13 in be rest-free contact. The flag 24 can consist of sheet iron. The underside 36 of the first arm 23 of the two-armed feeler lever 16 lies tangentially on the paint roller 12 with the thickness d1, so that the feeler lever 16 is in position I. During the process, the amount of ink decreases, so that an ink roller 32 has a reduced thickness d2. The two-armed feeler lever 16 is in position II - shown in broken lines -. A signal for controlling the ink feed 27 is output by the device 13, so that the ink roller again reaches the target thickness d1.

The device 13 is fixed to the side frame or ink fountain and is connected to the machine via an electrical line 26.

The device can of course also be set so that the ink supply 27 can be switched on immediately for a short time even with a slight reduction in the desired thickness d1. The thickness of the inking roller is preferably spaced continuously or at preselectable times scanned.

Advantageously, z. B. of five minutes using a known evaluation circuit, how many intervals d1; d2; d1 occur in correct printing operation - taking into account the surface area of the printing medium and the machine speed. For example, five intervals occur in the specified period of five minutes.

If the specified number of intervals is undershot, this is an indication of an incorrect formation of the inking roller and thus an indication of an incorrect delivery of the ink quantity. In this case an additional alarm signal is issued.

The principle of the method is that the ink fountain 2 with printing ink, for. B. highly viscous, is filled that during the Bet r i ebszus tandes part of the lower ink fountain 2 is free of printing ink, while in the other lower part of the ink fountain 2 a paint roller 12 is formed. This state is determined and evaluated according to further exemplary embodiments.

After a fifth exemplary embodiment (FIG. 2), for continuous or intermittent contactless measurement of the thickness d1 of the paint roller 12 above the ink fountain 1, an angle beta of approximately 20 ° in Circumference direction of the roller 4 pivotable measuring device 39, z. B. a U 11 Schnella 11 sensor or running zei tsensor arranged. This measuring device 39 measures the distance to the planes C and E. On the basis of a predetermined desired difference between the two planes C; E to one another can be determined whether there is enough printing ink 11 or whether a paint roller 12 has formed at all.

After a sixth execution example (FIG. 3), a circumferential direction of the roller 4 is increased by an amount f, z. B. half a width of the ink fountain 1 correspondingly, a measuring device 39 slidably arranged. The measuring device 39 operates as indicated in the fifth embodiment, and can be moved back and forth on a fixed rail 11 by means of a known linear drive (not shown).

According to a seventh exemplary embodiment (FIG. 4), measuring devices 39 which are spaced apart from one another by an amount f are fixedly arranged above the ink fountain 1 in the circumferential direction of the roller 4. The left measuring device 39 determines the distance from the plane C and the right measuring device 39 determines the distance from the plane E. The measuring method works as described in the fifth embodiment.

According to an eighth exemplary embodiment (FIG. 5), a CCD camera 41 is arranged above the ink fountain 1, with which an actual formation of the ink roller 12 is determined which is compared with a target formation of the paint roller (12) stored in a computer. In the event of deviations lying outside the tolerance range, corresponding signals are emitted, as in the previous exemplary embodiments.

According to a ninth embodiment (FIG. 6), a measuring device 39 is arranged in a plane G located above the ink fountain 1, which cooperates with a mirror 42 located above the ink fountain 1. The mirror 42 can be pivoted through an angle Beta of approximately 20 °, e.g. B. by means of an electromagnet, not shown, which can be reset to the initial position by spring force. The mirror 42 either directs the measuring beam onto the surface 21 of the paint roller 12 (plane C) or onto the plane E.

According to a tenth embodiment (FIG. 7), an interval measurement of the thickness d1 of the ink roller 12 in a plane C is carried out by an angle lever 43 fixed to the ink fountain and touching the surface 21 of the ink roller 12 in the radial direction. B. L-shaped. A first leg 46 of the angle lever 43 is attached to the top of the side wall 2 and carries a strain gauge 44. The second leg 47 runs vertically and parallel to the side wall 2. The plane C is approximately at a distance above the surface of the roller 4, which corresponds to the diameter d1 of a paint roller 12 (FIG. 7). It is also possible to arrange the strain gauge 44 on the second leg 47 of the angle lever 43.

According to an eleventh embodiment (FIG. 8), the side wall 2 and / or 3 is withdrawn towards the interior of the ink fountain 1. The resulting depression is covered by a bending plate 48. It is attached to the upper part of the side wall 2 and 3 and forms with its lower end and the inner surface of the doctor blades 8 and 9 a very small gap or lies on them. On the inside of the bending plate 48, at least one protrudes into the depression

Strain gauge 49 applied. By touching the rotating paint roller 12 with the bending plate 48, a bending moment is generated, which the strain gauge 49 detects and emits a corresponding signal, which is evaluated. Vibrations can also be detected by the strain gauge, which are evaluated and evaluated as an indication of a rotational movement of the paint roller 12.

The distance h can be up to a few millimeters.

However, it is also possible between the carrier 48 and the side wall 2 elastic material, for. B. to arrange silicone rubber.

According to an embodiment variant, not shown, at least one of the side walls has a load cell. When the ink roller 12 touches the pressure cell, a signal is output. In the exemplary embodiment according to FIG. 9, the device operates as in the subject of FIG. 8. Instead of free bending plate 48 at its lower end, a bending plate 51 is now used, which is attached to the top and bottom of the side wall 2 and / or 3 and thus a recess or opening 52 in them - tight against ink ingress - covers.

As can be seen from FIG. 9, the “bending plate” can also be carried out by removing material from the side wall 2 and / or 3 from the outside. As a result, the side wall 2; 3 hydrodynamic forces generated by the rotating paint roller 2 are subjected to bending. These generated bending stresses can be detected and evaluated by means of strain gauges 49. They are a measure of whether the paint roller 2 is rotating. This can also be determined in a different way via the strain gauges 49. This is because the vibrations through which the rotating paint roller 2 excites the bending plate 51 can also be electronically evaluated from the signals of the strain gauges.

Reference list

1 ink fountain 2 side wall, left (1) 3 side wall, right (1) 4 roller 5 6 front wall, front (1) 7 front wall, rear (1) 8 working squeegee 9 closing squeegee

10 -

11 Print color

12 paint rollers (11)

13 E n n i c ht

14 end, first (16)

15 -

16 feeler lever, two-armed 17 inner side (2) 18 bearing (2) 19 end, second (16) 20 21 periphery, surface (12) 22 arm, second (16) 23 arm, first, roller-guide lever ( 16) 24 flag (14) 25 26 cable, electrical 27 color feed 28 Setup 29 Line 30 Preset switch (28; 39) 31 Preset switch (28; 39) 32 Color roller (d2) 33 Color roller (d3) 34 Color roller (d4) 35 36 Bottom (23) 37 Top Rear (23) 38 Top edge (3) 39 Measuring device 40 41 CCD camera 42 Mirror l 43 Angle lifting lever 44 Strain gauge 45 46 Leg (43) 47 Leg (43) 48 Level plate 49 Strain gauge 50 51 Level 52 deepening, opening

Width (8)

d1 thickness (12) d2 thickness (32) d3 thickness (33) d4 thickness (34)

I location (24) II location (24)

Alpha angle (22, 23) Beta swivel angle (39)

C level E level G level

f amount h distance

Claims

Expectations

1. A method for determining the presence of a rotating ink roller (12) in an unpressurized ink fountain (1) of a rotary printing press, the ink fountain (1) cooperating with a roller (4): the thickness (d1 to.) Is continuously or at preselectable time intervals d4) of the rotating paint roller (12; 32; 33; 34) measured directly or indirectly at one or more points, the measured values for the thickness (d1 to d4) are converted into evaluable electrical signals.

2. The method according to claim 1, characterized in that the measured values are determined by means of optical or acoustic or inductive or capacitive devices (13, 16; 28; 16, 28; 16, 39).

3. The method according to claims 1 to 2, characterized in that at a predetermined thickness (d2; d3 or d4) of the paint roller (32; 33 or 34) a signal for controlling the ink supply (27) or a warning signal is output.

4. Device for performing the method according to claims 1 to 3, characterized in that for continuous or intermittent measurement of the thickness (d1 to d4) of the paint roller (12; 32 to 34) a direct non-contact (28) or an indirect contact (13, 16; 28, 16; 39, 16) device is used.

5. Device according to claim 4, characterized in that the device (28; 13, 16; 28, 16; 39, 16) works with optical or acoustic or inductive or capacitive means.

6. Device according to claims 4 to 5, characterized in that the device (28; 13, 16; 28, 16; 39, 16) is arranged fixed to the ink fountain or to the frame.

7. Procedure with the following steps:

Within the ink fountain (1) the thickness (C; E) of the printing ink layer is determined directly or indirectly at at least two measuring points spaced apart from one another in the circumferential direction of the ink fountain roller (4), so that the result of these measurements is then evaluated.

8. Device for performing the method according to claim 7, characterized in that above the ink fountain (1) in circumferential direction of the roller (4) through an angle (beta) pivotable measuring device (39) is arranged (Fig. 2) .

9. Device for performing the method according to claim 7, characterized in that above the ink fountain (1) by an amount (f) in Umfangsri direction of the roller (4) displaceable measuring device (39) is arranged (Fig. 3).

10. Device for carrying out the method according to claim 7, characterized in that above the ink fountain (1) two at a distance (f) in

Umfangsri direction of the roller (4) spaced measuring devices (39) are arranged (Fig. 4).

11. Device for performing the method according to claim 7, characterized in that a CCD camera (41) is arranged above the ink fountain (1), with which an actual formation of the paint roller (12) is determined, which with one in one Computer stored target formation of the paint roller (12) is compared (Fig. 5).

12. A device for carrying out the method according to claim 7, characterized in that in a plane (G) located above the ink fountain (1) there is a measuring device (39) which, with an over the ink fountain (1) arranged, the measuring beam the planes (C; D) directing, by an angle (Beta) ve r swivel mirror (42) cooperates (Fig. 6).

13. Process characterized by the following

Process steps: in at least one color box (1) in

Limit circumferential direction of an ink fountain roller (4)

Sidewall (2) and / or a squeegee (8), the at least partial hydrodynamic pressure exerted on them by the printing ink is determined and its

Measured values evaluated.

14. The method according to claim 13, characterized in that the measured values of the hydrodynamic pressure are used as a measure of the presence of a paint roller (12).

15. Device for carrying out the method according to claims 13 and 14, characterized in that a paint roller (12) in the radial direction touching angle lever (43) is arranged, which by means of an angle lever (43) attached strain gauge (44) in contact emits a signal with the surface (21) of the paint roller (12) (FIG. 7).

16. Device for performing the method according to claims 13 and 14, characterized in that a bending plate (48; 51) is arranged on the side wall (23) (Fig. 8 and 9).

17. The device according to claim 16, characterized in that the bending plate (48) is connected only with its upper end covering a recess with the side wall (2; 3) (Fig. 8).

18. The device according to claim 16, characterized in that the bending plate (58) with both ends of a recess (52) covering the side wall (2; 3) is arranged (Fig. 9).