EP0847857B1 - Adjustment device for a cross bar placed in front of a cylinder for a rotary printing machine - Google Patents

Description

The invention relates to an adjusting device in front of a Cylinder of a traverse arranged in a rotary printing machine according to the preamble of claim 1.

The prior art includes serving as measuring devices Sensor devices that are axial to the outer surface of the cylinder a rotary printing machine arranged on a traverse are already during measurement tasks on the rotary printing press machine running, e.g. for the register or color measurement. Another measurement task is moisture measurement, which can be done with a moisture measuring device.

A known moisture measuring device for determining the amounts of dampening solution on an offset printing plate includes a light source, an optics, a receiving device and an evaluation device (DE 37 32 934 A1). With this moisture measuring device the radiation from the light source should be focused on a color-free area of a printing plate is directed, which is clamped on a plate cylinder so that the reflected Radiation using a diode array in the Receiving device is detected. For aligning the moisture measuring device compared to the plate cylinder or the clamped Pressure plate, the moisture measuring device on a Traverse arranged parallel to the axis of the plate cylinder be axially displaceable to said axis. The Selection of the measuring point on the clamped printing plate can doing it visually.

A device for positioning the measuring field also belongs such a measuring device, which is also used as a sensor device is referred to a selected area of the Shell surface of a cylinder in a rotary printing press to the prior art, in which a pilot light source in the Sensor device is housed and in parallel with this Slidable to the lateral surface of the cylinder on the traverse is (DE 41 06 082 A1). With the integrated in the sensor device However, the measuring field should only be a pilot light source directly be visually captured. After what is grasped in such a way The measuring field is reached by manual actuation of a Contact triggered the position of the light spot of the pilot light source on the cylinder surface in a computing / control device entered, from whose output the measuring device can later be controlled so that the measuring device readings delivers from the selected area. - To the visual Selection of a color-free area suitable for the measurement the pilot light source can also be used independently of the Moisture measuring device can be arranged in front of the pressure plate.

The arrangement discussed above is not suitable for to record the relative position of the traverse in front of the cylinder, to align the crossbar with the cylinder enable. An exact alignment of the traverse The cylinder is essential to using conventional optoelectronic Measuring devices, such as those used for register and color measurements are used, meaningful, exact Get measurement results. For this purpose, the traverse should in particular parallel to the axis of the cylinder or its outer surface and run at a constant distance from this lateral surface. The parallel course of the traverse is for optical measuring devices important so that the areas of the lateral surface at all points of the cylinder under the same predetermined Angle and with the same beam concentration (focusing) to capture.

The necessary adjustment, at least once in practice, the traverse is used for protractors and distance measuring devices, but a cumbersome adjustment process require. The accuracy of the adjustment also depends on the care and skill of the person performing the adjustment Specialist.

The present invention is therefore based on the object an adjusting device of the type mentioned at the beginning create an accurate, straightforward, automatable Adjustment of the truss alignment with respect to the cylinder permitted and which is nevertheless interchangeable, d. H. to one prepared rotary machine can only be used if necessary is.

This object is achieved by the adjusting device with those specified in the characterizing part of claim 1 Features resolved.

The adjustment aid detects the at the registration point Relative position of the traverse to the closest area of the cylinder jacket on the principle that the angle of incidence of the light beam projected onto the cylinder on the cylinder equal to the angle of reflection of the reflected Beam of light is that of the area-sensitive optoelectronic Sensor is detected in the adjustment device.

In the inventive design of the optoelectronic Justierhilfsgeräts and the receiving bracket with which the Adjustment device is detachably connected, can also be achieved that the beam path of the adjustment device at the level of the optical Axis of the measuring device, which instead of Alignment aids to carry out the measurement, e.g. For the register or color measurement, on the bracket of the traverse can be attached.

By connecting the adjustment aid to the bracket can one and the same adjustment aid for adjusting a Large number of rotary printing presses prepared for this in the Can be used if necessary.

By connecting the area-sensitive optoelectronic sensor suitable with the evaluation electronics according to claim 2 is the position of the light beam reflected from the cylinder on the sensor and after converting it to electrical signals can indicate the deviation of the traverse at the Registration point, in particular the direction of deviation, with the display device can be displayed simply and clearly. According to this display, the adjustment e.g. manually and easy to control.

In a further development, the output of the evaluation electronics alternatively or in addition to their connection to the Display device with at least one electrical actuator related, which is suitable, at least to adjust one end of the crossbar with respect to the cylinder. In this case, a fully automatic adjustment of the crossbar respectively. Reading and setting errors become avoided.

In the variant of the adjustment device in which an output of the Evaluation electronics with an electrical actuator in There is a connection between the evaluation electronics and the actuating means further functional groups, in particular a motor controller.

The adjustment aid comprises particularly advantageously according to claim 4 as the beam of light projecting onto the cylinder optical elements using a semiconductor laser Beam shaping optics, which is designed such that at the point of impact of the laser beam on the cylinder only one small dot-shaped spot arises, which is an exact measurement the position of the adjustment device and thus the crossbar allowed the detection point opposite the cylinder.

As a surface-sensitive optoelectronic sensor, Claim 5 advantageous the optical receiver a four-quadrant sensor have one in the beam path Receiving optics is arranged. The receiving optics are designed that they reflect the reflected light beam or Laser beam widened somewhat to provide an optimized coverage of the sensor with the received reflected light beam to reach.

The evaluation electronics on the four-quadrant sensor connected, can be received by the four sensor areas Evaluate signals after amplification in a conventional manner. The evaluation can in particular be carried out in two evaluation stages take place, the first evaluation level the sum the signals of the upper quadrants (sensor areas) with the signals compares the lower quadrant and the second Level the signals of the left quadrants with those of the right Quadrants are compared. The result is a result which is the deviation in direction and amount of that Cylinder light spots reflected on the sensor reproduces a target position by a uniform application of all four quadrants of the four-quadrant sensor can be defined with the reflected light beam.

Instead of the four-quadrant sensor, the optical receiver a PSD element is advantageous as an optoelectronic sensor (Position Sensitive Device). Such area sensitive optoelectronic diodes provide an optically activatable Potentiometer, one of which depending on the location on it projected light beam in one direction or in two directions perpendicular to each other a voltage or current distribution corresponding to the location tapped and the location with the downstream evaluation electronics can be detected.

According to claim 7, the optical receiver can also be a Include matrix camera, which is expedient by a CCD camera is realized. This CCD camera has evaluation electronics, which indicates the location of the reflected light spot the matrix-like arrangement of the light-sensitive elements determined by means of an image processing system. But it can also for a simple display of the position of the light spot simple video monitor are sufficient.

According to claim 9, the matrix camera expediently has optics on the reflected light beam to 5 to 10% expands the area of a sensor matrix.

To adjust the traverse with this adjustment device, so that the traverse parallel to the axis of the assigned Cylinder or its surface is aligned and the Distance between the crosshead and the surface of the cylinder everywhere along the traverse is constant to avoid incorrect measurement To avoid the measuring device, the traverse is on their two outer ends independently of each other in two directions oriented at right angles to each other adjustable to the axis of the cylinder.

For automatic adjustment by the adjustment device the crossbar can be adjusted eccentrically at both ends stored and at each end with an electric drive coupled, which with an output of the evaluation electronics in Connection is established. This is a precise, low-wear Adjustment device realized after the implementation of the Adjustment is self-locking.

For successive use of the adjustment aid a bracket on the respective crossbar to be adjusted in front of a cylinder of the last printing unit of the rotary printing press is movable, the adjustment aid is reliable and reproducible using a bayonet coupling the bracket can be coupled. The bayonet coupling is on the bracket positioned that the optical axis of the Alignment aid at the same height as the axis of the measuring device lies.

Fig. 1

eine schematische schaubildliche Ansicht auf die Anordnung einer Traverse mit auf ihr verfahrbarer Halterung gegenüber einem ausschnittsweise gezeigten Zylinder des letzten Druckwerks einer Rotationsdruckmaschine;

Fig. 2

ausschnittsweise eine Seitenansicht auf eine exzentrische Lagerung der Traverse an einem ihrer beiden Enden;

Fig. 3

eine schematische Draufsicht auf das Justierhilfsgerät (geschnitten) und dessen Position bezüglich des schematisch und relativ klein dargestellten Zylinders;

Fig. 4

eine Seitenansicht auf die relative Lage zwischen dem Justierhilfsgerät und dem Zylinder bei korrekter Ausrichtung der hierin nicht dargestellten Traverse;

Fig. 5

die zu Fig. 4 gehörenden Lage des von dem Zylinder auf einen flächensensitiven Sensor in dem Justierhilfsgerät projizierten Lichtflecks;

Fig. 6

die Ausrichtung des Justierhilfsgeräts bzw. der nicht dargestellten Traverse, auf das Justierhilfsgerät gelagert ist bezüglich des Zylinders ebenfalls in einer Seitenansicht und

Fig. 7

die zu der Ausrichtung gemäß Fig. 6 gehörende Lage des reflektierten Lichtflecks auf dem flächensensitiven Sensor.

The invention is explained below with reference to a drawing with seven figures, which may result in further essential features of the invention. Show it:

Fig. 1

a schematic perspective view of the arrangement of a traverse with its movable holder relative to a cylinder shown in detail of the last printing unit of a rotary printing press;

Fig. 2

excerpts a side view of an eccentric mounting of the cross member at one of its two ends;

Fig. 3

a schematic plan view of the adjustment aid (cut) and its position with respect to the cylinder shown schematically and relatively small;

Fig. 4

a side view of the relative position between the alignment aid and the cylinder with correct alignment of the crossbar, not shown here;

Fig. 5

the position of FIG. 4 of the light spot projected by the cylinder onto a surface-sensitive sensor in the adjustment aid device;

Fig. 6

the alignment of the alignment aid or the crossmember, not shown, on the alignment aid is also mounted in a side view with respect to the cylinder and

Fig. 7

the position of the reflected light spot belonging to the alignment according to FIG. 6 on the area-sensitive sensor.

In Fig. 1, 1 is a cylinder, namely an impression cylinder the last printing unit of a rotary printing press referred to, in front of which a crossmember 2 as parallel as possible and in same distance from a cylinder axis, not shown, or to the outer surface of the cylinder 1 over the entire length of the Traverse is arranged. There is a bracket on the crossbar 3 slidably mounted to accommodate an optical Measuring device can serve from the drawing in detail does not emerge. A beam path 4 of the measuring device is indicated by a dash-dotted line.

To determine the orientation of the To adjust the crossbeam is the crossbeam on its two outer ones Ends, which can be called A end and B end, stored laterally in eccentrics. Such an eccentric with one round eccentric disc 5 in a round receiving it Bore 6 in a side part 7 of the printing machine is shown in Fig. 2, with a portion of the side part broken out is shown. The traverse 2 is in the eccentric disc 5 eccentric with respect to their virtual axis of rotation 8 arranged, whereby the eccentric effect when the eccentric disc rotates 5 is achieved in the bore 6.

It should be noted at this point that the traverse 2 in the Practice does not necessarily have to have a round cross-section, but that it may be useful to guide the bracket 3 can form the traverse with other cross sections.

The eccentric shown in Fig. 2 is at both ends 9 and 10 of the traverse 2 is provided, whereby the double arrows indicated adjustability of the cross member 2 in two to each other perpendicular directions that also to the not shown Axis of the cylinder are oriented at right angles becomes.

The movable on the cross member 2 by means not shown Bracket 3 has a bayonet coupling 11, the is indicated with a broken line, and the suitable is in connection with a corresponding bayonet coupling element on the adjustment aid indicated only in Fig. 1 15 this is detachable with the bracket, but precise positionable to connect. The not shown should optical axis of the adjustment aid is on the same Height is like axis 4 of the actual measuring device.

1 only shows the type of a block diagram, like the adjustment device 15 with a motor control, which with the Block 12 is indicated, is connected and not with the Bracket 3 needs to be moved. Motor control outputs are connected to servomotors 13, 14, of which each in rotary connection with one eccentric at the end 9 or 10 of the traverse 2 stands.

From Fig. 3, the adjustment aid designated 15 goes in a top view - with the cover removed or in the schematic forth. In a housing 16, which on its Front is provided with a glass window 17 is a Semiconductor laser 18 arranged with beam shaping optics 19, which is a laser beam of reduced diameter projected onto the cylinder 1 as a light spot 20. The The beam of light projected onto the cylinder 1 is 21 designated. That partially reflected by cylinder 1 Beam of light emanating from the light spot 20, bears the reference number 22 and is received by a receiving optics 23rd and an optical filter 24 on a four-quadrant sensor 25 thrown. The receiving optics 23 expand the reflected light beam 22 slightly so that the bundle of rays receiving area of the four-quadrant sensor, which is shown in FIG and FIG. 7 is shown and generally designated 26 there, is sufficiently covered. The optical filter 24 is in the Wavelength of the semiconductor laser 18 transmissive, so that external light influences be largely eliminated.

Immediately in connection with the four-quadrant sensor 25 there is an evaluation electronics 27, which signals from in the 5 and 7 shown four quadrants or surface areas of the received area 26 receives and evaluates. The evaluation electronics comprises two evaluation levels, one of which first stage, not designated, the sum of the signals from the upper Quadrants 28, 29 with the sum of the signals from lower Quadrants 30, 31 are compared. A second evaluation level compares the signals of the left quadrants 28, 31 with those the right quadrant 29, 30.

Outputs of the evaluation electronics 27 are - which is shown in FIG. 3 is not shown in detail - with a display device 32 connected, which shows how the position the crossbeam at the detection point of the adjustment aid 15, deviates from a target position. The display device can be a good / bad display with different colored LEDs be or be trained for analog display that also indicates the extent of the deviation from the target position.

Additionally or alternatively, the outputs of the evaluation electronics can 27 also connected to block 12 in FIG be one of the servomotors via a motor control 13,14 actuated to the positional deviation automatically compensate.

The detection of the position deviation with a four-quadrant sensor is illustrated in FIGS. 5 and 7, in each of which the receiving area 26 of the four-quadrant sensor in four receiving areas or quadrants 28 - 31 shown divided is.

4 and 5 shows that in the Case in which the light beam 21 emitted by the alignment aid 15 starts, so on the jacket of the cylinder 1st hits that the reflected light beam 22 in the same Height is reflected in the adjustment device, which is a correct alignment of the crossbar, not shown, to the Cylinder 1 signals the reflected light beam a spot of light 33 centrally on the receiving surface 26 throws; i.e. it becomes the same surface segments of all four quadrants 28 - 31 acted upon. Since in this case the signals of the upper two quadrants 28, 29 as the sum equal to the sum of the Signals from the other two quadrants 30 and 31 are signaled the evaluation electronics 27 no positional deviation.

In contrast to this, according to FIG. 6, the traverse 2 is on the Detection point of the adjustment device 15 too high compared arranged the cylinder. The reflected beam of light 22 is therefore on the starting from the adjustment 15 Thrown back light beam 21. As a consequence, that the reflected light beam has a light spot 34 on the upper surface segments 28, 29 of the receiving surface 26 generated. This can be done in a corresponding manner with the display device 32 are displayed and via at least one of the Servomotors 13, 14 are balanced, as long and in be set in motion until the light spot 34 in FIG. 7 assumes the position of the light spot 33 in FIG. 5.

The following measurement processes are possible according to this principle:
Measuring the inclination of the traverse 2 in relation to the cylinder 1:
The adjustment aid 15 is guided together with the holder 3 into a position near one of the two lateral end positions at the ends 9, 10, but the adjustment aid still detects the cylinder 1, ie projects a light beam onto it and receives the reflected light beam. The reflected light beam is then a measure of the positional deviation of the cross member 2 at this end, which can be determined and compensated for in the manner discussed.

Measuring the inclination of the traverse 2 from one side or one end 9 to the other end 10:
The adjustment aid 15 is first brought into a first end position, for example at the end 9, and then moved into the other position at the end 10. During this process, the sensor signals, ie the signals from the four-quadrant sensor, should not change. Different signals from the upper quadrants 28, 29 on the one hand and the lower quadrants 30, 31 on the other hand indicate the direction and amount of the deviation from the desired position.
Measuring process parallelism of the traverse 2 to the lateral surface of the cylinder 1:
The adjustment aid 15 is in turn brought into a lateral end position on the crossmember. Then the distance between the cross member 2 to the cylinder 1 is automatically changed with the servomotors 13, 14 so that the two left quadrants 28, 31 are acted upon by the same amount of light from the reflected light beam 22 as the right quadrants 29, 30. After that, the Adjustment aid 15 continuously moved laterally in the direction of the other lateral end position. The signals from the quadrants of the four-quadrant sensor must not change during this lateral process. If there is a deviation in the display, the area-sensitive four-quadrant sensor will signal the direction and strength of the positional deviation by the different signals from the left quadrants 28, 31 on the one hand and the right quadrants 29, 30 on the other hand.

Reference list

1

cylinder

2nd

traverse

3rd

bracket

4th

Beam path measuring device

5

Eccentric disc

6

drilling

7

Side panel

8th

virtual axis of rotation

9

End of the traverse

10th

End of the traverse

11

Bayonet coupling

12th

Block (and other functional groups)

13

Servomotor

14

Servomotor

15

Alignment aid

16

casing

17th

Stained glass window

18th

Semiconductor laser

19th

Beam shaping optics

20th

Spot of light

21

Beam of light

22

reflected light beam

23

Receiving optics

24th

optical filter

25th

Four-quadrant sensor

26

received area

27

Evaluation electronics

28

upper quadrant

29

upper quadrant

30th

lower quadrant

31

lower quadrant

32

Display device

33

Spot of light

Claims (11)

1. Adjustment device for a crossbar arranged in front of a cylinder of a rotary printing press, wherein on the crossbar (2) a mounting (3) is arranged slidably axially relative to the surface of the cylinder (1), and the mounting (3) receives a measuring unit as'well as optical elements projecting a beam of light rays (21) on to the cylinder (1), characterised in that at least one end of the crossbar (2) is adjustable relative to the cylinder (1) by means of a fitted electrical adjustment means, that the optical elements projecting a beam of light rays (21) on to the cylinder (1) are constructed as an optical adjustment accessory (15) releasably connected with the mounting (3), wherein arranged in the optoelectric adjustment accessory (15) is at least one optical receiver which receives a beam of light rays (22) reflected from the cylinder (1) and comprises an optoelectronic sensor, that the optoelectronic sensor of the adjustment accessory (15) is connected with an evaluation electronics (27) for determining the position of the reflected beam of light rays (22) on the sensor, and that at least one output of the evaluation electronics (27) is connected with an electronic adjustment means of an end of the crossbar (2).
2. Adjustment device according to claim 1 characterised in that at least one output of the evaluation electronics (27) is connected with an indicator device (32) which is suitable for displaying the relative position of the reflected beam of rays on the sensor surface (26).
3. Adjustment device according to one of claims 1 and 2 characterised in that the optical elements projecting the beam of light rays on to the cylinder (1) comprise a semiconductor laser (18) as well as a beam-forming optics (19).
4. Adjustment device according to one of claims 1 to 3 characterised in that the optical receiver has a four quadrant sensor (24) which is arranged in the beam path of a receiving optics (23).
5. Adjustment device according to one of claims 1 to 3 characterised in that the optical receiver has a PSD (position sensitive device) element on to which the beam of light rays reflected from the cylinder (1) is projectable.
6. Adjustment device according to one of claims 1 to 3 characterised in that the optical receiver comprises a matrix camera.
7. Adjustment device according to claim 6 characterised by a CCD camera as matrix camera.
8. Adjustment device according to claim 6 or 7 characterised in that the matrix camera has an optics which spreads out the reflected beam of light rays (22) to 5 to 10% of the surface of a sensor matrix.
9. Adjustment device according to one of claims 6 to 8 characterised by an image processing system to the matrix camera.
10. Adjustment device according to claim 1 characterised in that the crossbar (2) is mounted adjustably eccentrically at both ends (9,10) and is linked at each end with an electrical drive which is connected with an output of the evaluation electronics (27).
11. Adjustment device according to one of the preceding claims characterised in that the adjustment accessory (15) can be linked with the mounting (3) by means of a bayonet coupling (11) .

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