JPH07505100A - Web - A device for measuring the misregistration between individual colors when printing in multiple colors on a rotary printing press. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Web - Measuring the misregistration between individual colors when printing in multiple colors on a rotary printing press The present invention relates to a web-rotary printing apparatus described in the front frame concept of claim 1. Relating to a device for measuring misregistration between individual colors when printing in multiple colors on a machine .

In web-rotary printing presses with one drying device for each printing mechanism, the One registration mark for each printing mechanism is used to detect errors in the unique image. printed on strips located at the front. Therefore, behind the second printing mechanism there are two There are registration marks, and these registration marks are the colors that are printed each time, or represents the relative position of the four printing presses to each other, so that in the case of four-color printing, the four printing presses Behind the structure, there are a total of four dragonflies on the lateral strips.

After the second printing mechanism, for example, a first check for existing misregistration is carried out.

For this reason, for example, the method known from German Patent No. 4037728 According to the above-mentioned type of device, each inspection head is equipped with, for example, a fiber optic There are web inspection elements that can also be configured in the form of standard measurement receivers. centre In fiber optic measurement receivers, the web inspection element is Therefore, they can only be arranged with a minimum mutual spacing of 18 mm. The result As a result, the registration marks must be arranged with a minimum mutual spacing of 20 mm, such In the case of equipment, misregistration occurs when the register marks of 1 color and 2 colors, 2 colors and 3 colors, and 3 colors and 4 colors occur. Detected by measurement reception. As a measurement, multiply by the respective web speed. A time signal that produces a misregistration is measured.

In this case, first of all, the limited space on the side strips where the registration marks are printed is Disadvantages arise from the large dimensions required by the registration mark itself. This is because the register marks are printed at 20mm intervals in the running direction of the entire printed paper. As a result, in some printing methods additional side strips are also required. Space problems arise for printing marks.

Furthermore, the 20mm spacing given to the front edge of the register mark may be shifted (light spot adjustment). An alignment error occurs. This is because the optical axis of the web inspection member is 20 mm. They cannot be precisely aligned with each other so that the spacing can be maintained accurately. It is the body. However, the evaluation device and the control device for correcting the misregistration are Since the actual value of 20mm is received, adjustment errors are compensated by fine manual adjustment. This can only be done by experts and is time consuming. It takes.

Therefore, it is an object of the present invention to have a simple structure and to provide a The front rail concept of claim 1 is characterized by a space saving in the side strips. On the web - When printing multiple colors on a rotary printing press, the misregistration between individual colors The object of the present invention is to provide a device for measuring.

This object is solved by the features of claim 1.

With the device according to the invention, the spacing between individual registration marks or printing marks can be increased from 3 to 3. It can be reduced to a predetermined spacing of 5 mm. This results in significant space savings and This also results in savings in waste paper.

Furthermore, in the device according to the invention only one web inspection element is mechanically inspected. In this case, in principle, detection at the roller can be performed. Ru. It is further advantageous that web flapping can be eliminated and that according to the invention This reduces wasted time.

Additionally, an absolute distance measurement of the spacing between two registration marks can be performed; A further advantage is that zero adjustment is no longer necessary. This is it This results in savings in wasted time and waste paper. Appointment mark interval is printed registration represents that is zero.

Another advantage of the device according to the invention is that it allows switching from level control to sequence control. but preferably also automatically, for example during machine operation or when changing the web. Examples include. In this case, the level measurement always relates the misregistration to the first color. means a measurement that However, in this case, in conventionally known devices, the condition of the printing press is The disadvantage arises that in some cases the printing is no longer applied, so that the first color The measurement must wait until the final printing mechanism is reached.

These disadvantages arise because in the device according to the invention, the measurement depends on each preceding color. This can be eliminated by first performing sequence measurements that are Wear. If all colors are printed and arrive at the last printing mechanism, the main print The device according to the invention advantageously automatically switches over to the level measurement mentioned above. As a result, waste paper can be saved.

According to the invention, the detection of the two marks is carried out by only one web inspection element. In machines where the register marks or printing marks are in front of each other in the running direction of the entire printed sheet placed after. The printed mark is the same as for conventional double web inspection parts. can be optically detected, converted to an electrical analog signal and automatically viewed. Sent to matching device. However, unlike traditional types of equipment, advantageously Only physical signals need to be sent to the automatic registration device.

Advantageous developments of the invention are described in the dependent claims.

Advantageously, the web inspection element is configured as a fiber optic web inspection element. ing.

In the device according to the invention, the registration marks are also aligned and mutually aligned in the running direction of the entire printed sheet. Mark spacing should be clearly defined, even if they are placed one behind the other and spaced apart from each other. The advantage is that the device according to the invention can be easily shortened. When using , the space problem mentioned at the beginning no longer occurs.

An electrical window is used to select the registration marks detected and evaluated by the evaluation device. can be installed. The window selects the detected marks and therefore each measurement Despite the aligned alignment of registration marks, only one web inspection station Even though only the material is present, the misregistration is always measured each time. Dragonflies that must be utilized for this purpose are detected and evaluated.

With the device according to the invention, a measuring reception is advantageously carried out depending on each printing mechanism. .

Details, features and advantages of the invention will become apparent from the following description of an exemplary embodiment with the aid of the drawings. Become.

However, in the drawing: FIG. 1 shows an automated system for monitoring a web-rotary printing press, including a measuring device according to the invention. 2 is a highly simplified schematic diagram of a dynamic registration device, FIG. FIG. can be, FIG. 3 schematically shows the configuration of a register mark that corresponds to a very simplified web inspection member. is a diagram corresponding to FIG. 2, FIG. 4 is a diagram illustrating in one embodiment the signals generated through the device according to the invention; 5 is a diagram for explaining the first embodiment of signal generation, and FIG. 6 is a diagram for explaining the first embodiment of signal generation. FIG. 6 is a diagram corresponding to FIG. 5 of a second embodiment of the invention;

In the schematically simplified drawing of FIG. 037728 for monitoring a web-rotary printing press 2. an automatic registration device is provided having a control device l for the first time, and in this case: The present invention incorporates the device according to the present invention into an automatic registration device. Even in a separate device for measuring deviation, the present invention described in the claims of this application applies. It is also embodied in automatic registration devices including devices based on In order to supplement the published contents of the application, the specification of Federal Republic of Germany Patent No. 4037728 The complete publication content of the book is incorporated into the content of this application.

The web-rotary printing press 2 shown in FIG. 1 has four printing mechanisms 3 to 6 in the exemplary embodiment. In these printing mechanisms 3 to 6, yellow, red, blue and black inks are A running printing sheet is successively applied to the printing material 7 in the form of a sheet.

For this reason, each of the printing mechanisms 3 to 6 has a respective one rotating in the ink reservoir. impression cylinder8. 9. As shown in Figure 1, the material web has 10 and 11 7 are guided successively through the printing mechanisms 3 to 6, in which case the material web 7 is It is guided via impression cylinders 8-11.

Each printing mechanism of the web-rotary printing press 2 further includes a drying device 12 .　13゜ 14 and 15, and these drying devices 12 to 15 serve to dry the material web 7. Viewed in the row direction, the associated impression cylinder8. 9. It is located behind 10 and 11. dry The drying devices 12-15 can also be constructed, for example, in the form of drying drums.

Furthermore, the printing mechanism 3, 4.5 with the registration roller device has an adjusting member 16° 1 7 and 18, and each of these adjustment members 16 to 18 has one adjustment module. It has data 19, 20 and 21.

The automatic registration device, which shows the control device located inside the casing (not shown), a center unit 2 for detecting and storing control parameters and control characteristics; It has 2.

Furthermore, the automatic registration device can be configured as a pluggable module, for example. It has multiple control units, and in Figure 1, the control units are A control unit 23 is shown. These control units control vertical registration. for control and/or combined control of vertical and horizontal registration. used for the purpose of Also for this purpose, the previously mentioned regulating motor 1 9 to 21 act in each case on the adjusting elements 16, 17 and 18.

As explained at the beginning, in the multicolor printing carried out on the web-rotary printing press 2, , an apparatus according to the invention for measuring the misregistration between individual inks is illustrated in FIG. The device according to the invention, which is incorporated into the overall device, has an inspection device 24. There is. This inspection device 24 has an inspection section for each measurement point in the printing mechanisms 4.5 and 6. It has heads 25, 26 and 27. These inspection heads 25 to 27 are The star mark or registration mark PI-P4 (see FIGS. 2 and 3) is detected. others Therefore, the inspection heads 25, 26 and 27 are installed at appropriate locations in the printing mechanisms 4, 5 and 6. It is then arranged behind the impression cylinder, viewed in the running direction of the web material 7.

The inspection heads 25, 26 and 27 are coupled to a signal receiving unit of the inspection device 24. ing. This inspection device 24 combines the detected signal with the center unit 22. It is further given to the evaluation device 33. This evaluation device 33 evaluates individual dragonflies PI to P. 4 relative positions to each other are measured.

In contrast to previously known devices for measuring misregistration, the device according to the invention Inspection heads 25-27 have only one web inspection element. This web inspection The members are designated Tt, Tx and T3 in FIG.

The web inspection elements T1 to T are preferably fiber-optic web inspection elements. It is composed of These web inspection members T+”’Ts are the registration marks P1 to P1. 4 is detected optically and an electrical analog signal is generated, and this analog signal is evaluated. is sent to the value device 33. The evaluation device 33 uses the sent signals to evaluate the registration marks P1 to P. 4 and transmits the resulting results via the center unit 22. and is sent to the control unit 23. This control unit 23 further Via the lines 40, 41 and 42, the adjusting motor 1 for carrying out the registration correction It is connected to 9.20 and 21.

In the schematically highly simplified drawing of FIG. 2, in this example four images 4 3.44.A portion of a material web or printed sheet 7 having 45 and 46 is shown. The registration marks P1 to P4 correspond to the nine images 43 to 46, and these registration marks The board PI-P4 prints the images 43 to 46 on the side strips 47 of the printing sheet 7. From Figure 2 printed together, web inspection member T1 to images 44, 45 and 46 ,T! The correspondence relationship between and T is clear. Here, we will explain the measurement points and inspection points. Only one web inspection element 'r+, Tz or T is provided per board. The web inspection element detects the respective register mark and generates a corresponding signal. Ru.

FIG. 3 shows the arrangement of the register marks P1 and P2 and the distance A between them. this From the figure, the register marks are arranged in alignment with each other back and forth when viewed from the running direction of the entire printing paper 7. and correspondingly by the respective web inspection element T,,'rz or T. It is clear that this can be detected. The distance A can be kept to 3 to 5 mm. Ru.

The distance A between the two registration marks is determined by a signal generator, for example the rotation signal generator shown in FIG. 30, 31 and 32. According to this, as shown in Figure 4, by the leading edge v1 of the first signal S1 received by the respective web inspection element. The counter starts and stops at the leading edge ■2 of the second signal S2. The number of pulses generated by counting is directly related to the stroke distance or the interval A between the register marks. (e.g. 5 pulses corresponds to a spacing A of 5 mm), so that Direct spacing measurements can be carried out with the device according to the invention. while detected As the spacing deviates from the known actual spacing between dragonflies, each Misregistration can be measured.

In order to further explain and clarify the device according to the invention, reference is made to FIGS. 5 and 6 below. Explained below.

There is only one web testing member T, , T, or T per testing head. This causes a time lag between the register marks P1 to P4. This deviation is a dragonfly depends on the interval A.

To digitize and reprocess marks, each mark itself is will be converted into a file. To this end, separate gates (Figs. 6; gate 2) exists. In this case, the data for each mark is The principle of digitization corresponds to the principle in double web inspection elements, as shown in Figure 1. In the control arrangement shown, analog signals are applied to two identical digitization stages. and one gate each of both gates is applied to these digitizing stages. Gate 2 is then sent to evaluate the corresponding mark.

The spacing of the marks is determined by the method of the present invention, which uses only one web inspection member per measurement location. Therefore, a third gate (measuring gate) is used. This measurement A gate is present along both digital marks Kl,2. These signals are , is sent to the previously mentioned counter stage for measurement, and this counter stage has the described direct Perform direct spacing measurements.

The printing interval of marks corresponding to interval A is then processed by suitable software. be managed.

According to FIG. 6, it is also possible to input data by changing the interval between register marks in principle. . That is, by positioning a third or a plurality of other marks between the detected marks. You can also This advantageously allows the measurement method (level control or sequence This makes it possible to switch between 1 and 2, or to arrange various registration marks.

by the measuring device according to the invention or by an automatic registration device equipped with this measuring device. Therefore, it is advantageous to carry out a web/web or web/cylinder control. can do.

Therefore, as explained at the beginning of the description with respect to the drawings, the invention lies within the scope of the claims. In addition to the limited measuring equipment in the web-rotary printing press 2, It is also embodied in a device for automatic registration. This web - rotary printing machine is a central unit for detecting and storing all control parameters and control characteristics. The control device 1 has a control device 1 with Multiple inspection heads and adjustment members 16, 17 and 1 for controlling right registration It has an inspection device 11f24 equipped with 8. In this case, the measurement location and inspection head Only one web inspection member T, , T, and T for each code 25 to 27 is already mentioned. provided in form and manner.

Figure 5

Claims (5)

[Claims] 1. Registration marks (P1 to P4) printed together in different colors on the entire printed sheet (7) An inspection device (with one inspection head (25 to 27) for each measurement location) 24) and Measuring the relative position of each register mark (P1 to P4) that cooperates with the inspection device (24) in a web-rotary printing press, having an evaluation device (33) for In a device that measures the misregistration between individual colors during color printing, Each said inspection head (25-27) has only one web inspection member (T1, In a web-rotary printing machine characterized by having only T2, T3) A device that measures the misregistration between individual colors when printing multiple colors. 2. The web inspection elements (T1, T2, T3) are fiber optic web inspection elements. The device according to claim 1, characterized in that it is comprised of: 3. The registration marks (P1 to P4) are aligned in the running direction (L) of the entire printing sheet (7) and aligned with each other. Claim 1 or 2, characterized in that the or the device described in 2. 4. The registration marks (P1 to P4) detected and evaluated by the evaluation device (33) are Claims 1 to 3, characterized in that an electrical window for selection is installed. The device according to any one of . 5. It has a switching device for switching between sequence measurement and level measurement. 5. The device according to claim 1, characterized in that: