JP2695166B2 - Initial adjustment method of register adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a register adjusting device for maintaining good registration (hereinafter referred to as register) of each color of a multicolor printing machine, and more particularly to a register. The present invention relates to an initial adjusting method for an adjusting device. (Prior Art) Conventionally, in a multi-color printing machine, a register adjusting device is used to automatically keep a register in a good state during printing. This register adjusting device will be described with reference to FIGS. The register adjusting device detects the register adjusting marks 16 printed by the plate cylinders 10 at regular intervals for each color on the margins of the print pattern of the running paper 25 by the scanning head 6 provided downstream of the plate cylinders 10. During printing, the position of the compensator roller 12 provided between the plate cylinders 10 is moved so that the register adjustment marks 16 are always printed at regular intervals. The register adjustment mark 16 on the running paper 25 is printed by the register adjustment mark 15 formed on each plate cylinder 10. Next, the case of a two-color printing machine will be described in detail. As shown in FIG. 6, the running paper 2 is placed immediately after the second color plate cylinder 10b.
A scanning head 6a is provided for detecting the first and second color registration adjustment marks 16a and 16b. Also, between the first color plate cylinder 10a and the second color plate cylinder 10b,
A compensator roller 12a is provided so that registration can be performed by changing the distance between printing points of the running paper 25 between the color plate cylinder 10b. Mark detecting elements 32, 33 are arranged on the scanning head 6a in the traveling direction of the traveling paper 25 at the same intervals as the register adjustment marks 16a, 16b. Of these, the mark detecting element 32 detects the first color register adjusting mark 16a, and the mark detecting element 33 detects the second color register adjusting mark 16b. If the 1 and 2 color registrations are correct, the registration adjustment marks 16a and 16b of the 1 and 2 colors will be the scanning head mark detection element 3
Since it is printed at the same intervals as 2, 33, mark detection elements 32, 3
Reference numeral 3 simultaneously detects the register adjustment marks 16a and 16b. However, if they are misaligned, the mark detection elements 32, 33
There is a time lag in detecting the register adjustment marks 16a and 16b. Based on the time difference, the register adjuster body calculates the amount of movement of the compensator roller 12a. Then, the compensator roller 12a is moved so that the register adjustment marks 16a, 16b are at a predetermined interval, and control is performed so as to match the register. The case of a four-color printing machine will be described in detail with reference to FIG. The scanning head 6b immediately after the second color plate cylinder 10b detects the register adjustment marks of the first and second colors and detects the first compensator roller 12a.
Control. Further, the scanning head 6c immediately after the third color plate cylinder detects the second and third color register adjustment marks and controls the second compensator roller 12b. Similarly, the scanning head 6d immediately after the fourth color plate cylinder detects the third and fourth color register adjustment marks and controls the third compensator roller 12c. That is, the scanning heads 6b, 6c, 6d detect the register adjustment marks, and the gates 37a, 37b, 37 are added to the detection signals.
Register adjustment units 35a, 35b, 3 from c to the specified gate
Send to 5c. Then, in response to signals from the register adjusting units 35a, 35b, 35c, the compensator roller position controllers 36a, 36
Each compensator roller 12a, 12b, 12c is controlled via b, 36c. In the above-described multicolor printing press, the register adjustment marks of each color are generally arranged at intervals of about 20 mm. Also, each scanning head 6 is not confused with other marks,
A detection signal from each scanning head 6 is gated so that only a predetermined register adjustment mark can be detected. Next, an initial adjustment method of the register adjustment device having such a configuration will be described. As shown in FIG. 8 and FIG. 9, the plate cylinders 10a, 10 of each color are
When attaching b and 10c to each printing unit (not shown),
Register misalignment visual marks 31a, 31 previously placed in the same position with respect to the pattern in the non-pattern part of each plate cylinder 10a, 10b, 10c
Align b and 31c (hereinafter referred to as register marks) to the same reference position for each printing unit. In this way each plate cylinder
The phases of 10a, 10b and 10c are matched. Next, the compensator rollers 12a, 12 are arranged so that the patterns printed on the running paper 25 by the respective plate cylinders 10a, 10b, 10c are in register.
Adjust the position of b. That is, since the phases of the plate cylinders 10a, 10b, and 10c are matched with each other, for example, the first color plate cylinder 10a and the impression cylinder 1
The distance of the running paper 25 between the contact point (printing point) with 1a and the contact point (printing point) with the second color plate cylinder 10b and the impression cylinder 11b is determined by the plate cylinders 10a, 10b,
Compensator roller 1 to be an integral multiple of the circumference of 10c
Adjust the positions of 2a and 12b. As an integer method of the compensator rollers 12a, 12b,
The pattern actually printed or the aforementioned dragonfly 31a, 31b,
Look at 31c and adjust the compensator roller 1
A method of adjusting the positions of 2a and 12b is used. In this way, if the printed pattern is in register, the register adjuster 34 gates the detection signal of the scanning head for each register adjustment mark of each color. Next, the predetermined gate position applied to the detection signal from the scanning head 6 will be described. As shown in Fig. 10, as a method of setting the gate position, the detection signal from the scanning head 6 and the signal in which the gate is superimposed are displayed on the oscilloscope, and the operator can switch the gate position forward and backward while watching this signal. There is a method of adjusting so that the detected waveform of the register adjustment mark is within the gate. There is also a method in which the register adjuster 34 automatically sets the gate position. As a method for automatically setting the gate position as described above, as shown in FIG.
A mark called an auto gate mark 38 is placed in front of the register at a predetermined distance from the register adjustment mark 16, and the auto gate mark 38 is detected by the scanning head 6,
There is a method of automatically setting the gates to the register adjustment marks 16 following this one by one. Further, as shown in FIG. 12, the scanning head 6 detects all the marks and patterns on the scanning line 40, and among these detection signals, a signal considered as the signal of the register adjustment mark 16, for example, a signal of the same shape is There is also a method of automatically setting gates for signals lined up at intervals. (Problems to be Solved by the Invention) As described above, there is an automatic gate setting method as a method for setting the gate position. However, for example, in the method using the auto gate mark, it is necessary to previously put the auto gate mark on the plate cylinder, and there is a problem that the plate cylinder must be remade. In addition, in the method of setting the gate to the signal that seems to be the register adjustment mark signal from the detection signals of the marks on the scanning line, if there is a mark similar to the register adjustment mark, it is mistakenly recognized as the register adjustment mark. There is a risk that the gate will be put on. On the other hand, if the automatic gate setting method is not used, the above-mentioned problems do not occur, but it is necessary to make adjustments, for example, while confirming each color with an oscilloscope at the time of initial adjustment. This adjustment operation is a time-consuming operation even for a skilled operator, and there is a problem that setup (initial adjustment) takes a long time, and the initial adjustment is complicated. The present invention has been made in view of the above points, and an object thereof is to provide an initial adjustment method for a register adjustment device that can be quickly and accurately performed. [Structure of the Invention] (Means for Solving the Problems) The present invention detects the register adjustment mark of each plate cylinder printed on the running paper by a scanning head using a preset gate signal, and Provided on each plate cylinder in the initial adjustment method of the register adjustment device of the multicolor printing machine that moves the position of the compensator roller arranged between each plate cylinder so that the register adjustment marks on the plate cylinder are printed at regular intervals. Aligned registration adjustment mark on the printing unit to the reference position of the printing unit, and only the registration adjustment mark for each plate cylinder from the initial phase of the drive shaft of each plate cylinder and the paper path from the contact between the plate cylinder and impression cylinder to the scanning head. Calculate the gate position for detecting, and adjust the gate position for each plate cylinder based on the calculated value so that the register adjustment marks of each plate cylinder are printed on the running paper at regular intervals. The initial adjustment method for register adjustment device characterized by adjusting the position of each compensator rollers. (Operation) According to the present invention, when the gate position is set during the initial adjustment, for example, it is not necessary to check each color with an oscilloscope, and the initial adjustment of the register adjustment device can be performed easily and easily. (Example) Hereinafter, an example of the present invention will be described with reference to the drawings. The same parts as those of the conventional device are designated by the same reference numerals, and detailed description thereof will be omitted. 1 to 4 are views showing an embodiment of the register adjusting device according to the present invention. In FIG. 1, the register adjusting device prints the register adjusting marks 16 printed by the plate cylinders 10a, 10b, 10c, 10d at regular intervals for each color on the margins of the printing pattern of the running paper 25, and During the printing, this register adjustment mark 16 is detected by the scanning heads 6b, 6c, 6d provided downstream.
, So that each plate cylinder 10a, 10b, 10c,
The positions of the compensator rollers 12a, 12b, 12c provided between 10d are moved. That is, the register adjusting device includes scanning heads 6a, 6
b, 6c, 6d input detection signals to move the position of the compensator rollers 12a, 12b, 12c register adjuster 4, compensator roller preset device 2 for presetting the initial position of the compensator rollers 12a, 12b, 12c, Motors 14a, 1 for driving compensator rollers 12a, 12b, 12c
4b, 14c and encoders 13a, 13b, 13c for detecting the positions of the compensator rollers 12a, 12b, 12c. An initial adjustment device 1 having a push button switch 5 is connected to the register adjuster 4, and a prime mover phase detector 3 for detecting the phase of the prime mover of each plate cylinder 10a, 10b, 10c, 10d is further provided with the initial adjustment device 1 and the register. It is connected to the regulator 4. A plate cylinder circumference input device 7 is connected to the initial adjustment device 1. In FIG. 1, the running paper 25 runs from the paper feed side winding 26 toward the paper discharge side winding 27. Next, the internal configuration of the initial adjustment device 1 will be described with reference to FIG. The initial adjustment device 1 is connected to the bus line 28 with the CPU22, ROM23, RA
An M24, a phase reading device 18, a switch reading device 19, a gate position setting device 20, a compensator roller position setting device 21, and a plate cylinder circumference length input device 7 are connected to each other. Further, the driving phase detector 3 is provided in the phase reading device 18, the push button switch 5 is provided in the switch reading device 19, the register adjuster 4 is provided in the gate position setting device 20, and the compensator roller preset device 2 is provided in the compensator roller position setting device 21. It is connected. Next, an initial adjustment method of the register adjustment device having such a configuration will be described. First, the principle of the initial adjustment method will be described with reference to FIG. First, with the prime mover (not shown) stopped, the printing cylinder (not shown) is adjusted by aligning the register adjustment mark printing portion 15 with the plate cylinder 10 of each color at an arbitrary reference position (for example, right next to the center of the plate cylinder 10). No)). The driving phase θ ₀ at this time is detected by the driving phase detector 3. Incidentally, the method of aligning the register adjustment mark printing unit 15 with an arbitrary reference position is not limited to the one in which the register adjustment mark printing unit 15 is directly aligned with the reference position as in the above example, and other methods provided on the plate cylinder 10 The mark or a key attached to the shaft of the plate cylinder 10 may be aligned with the reference position, and the reference position does not have to be common to each unit. Subsequently, the driving phase θ _g when the register adjustment mark 16 of the running paper 25 passes right above the scanning head 6 is calculated as follows. When the register adjustment mark 15 of the plate cylinder 10 comes to the position Q during printing, the register adjustment mark 16 of the running paper 25 comes to the position Q '. The driving phase at this time is θ ₀ . The contact point between the plate cylinder 10 and the impression cylinder 11, that is, the distance PS from the printing point P to the position S of the scanning head 6 is a length determined by the circumference of the plate cylinder for each printing machine. Next, PQ 'is calculated from the position Q and the circumference of the plate cylinder 10. For example, if P is right above the plate cylinder 10 and Q is right next to the plate cylinder 10, then PQ '= PQ = L / 4. (L: Perimeter of plate cylinder 10) ∴Q'S = PS-PQ 'When the register adjustment mark 16 on the running paper 25 moves from Q'to S, the plate cylinder 10 rotates by an angle θ. At this time, θ is θ =
Q'S / r (r: radius of plate cylinder 10). For example, if the rotation ratio between the prime mover and the plate cylinder 10 is 1: 1, the prime mover phase θ _g at this time is θ _g = θ ₀ + θ Next, the gate applied to the detection signal from the scanning head 6 will be described. The gate is generally designed to open with a certain width. Therefore, the range in which the gate is opened is the driving phase θ _g ± α / 2. However, α = W / r (W: gate width on running paper 25) In this way, the gate to be applied to the detection signal from the scanning head 6 is preset. Here, when the position of the compensator roller 12 is adjusted so that the distance between the printing points P on each plate cylinder 10 of the running paper 25 becomes an integral multiple of the circumference of the plate cylinder 10 as in the conventional case, the running paper 25 on the running paper 25 is adjusted. The register adjustment marks 16 of the respective colors are overprinted at the same position.
Therefore, the distance between the print points P of the running paper 25 is adjusted so that the register adjustment marks 16 of each color are printed at the predetermined interval d. That is, if the distance between the printing points P on the running paper is T, then T = nL + d (1) or T = nL-d (2). (N: integer, L: plate perimeter) Which of the above formulas (1) and (2) is used depends on the positional relationship of the register adjustment marks of each color, but the register adjustment is made in the traveling direction of the running paper 25. When the marks 16 are arranged in the order of printing, the expression (2) is used, and when the marks 16 are arranged in the opposite direction, the expression (1) is used. Subsequently, the specific operation will be described with reference to the flowchart of FIG. The plate cylinders 10 of the respective colors are aligned with the register adjustment mark 15 right next to the center of the plate cylinder 10 and attached to the printing unit. When the push button switch 5 is pressed at this time, the signal from the push button switch 5 enters the CPU 22 via the switch reading device 19, and the driving phase θ ₀ at this time is set by the CPU 22 via the driving phase detector 3 and the phase reading device 18. Read. Next, when the plate cylinder circumference input device 7 inputs the plate cylinder circumference, the CPU 22 calculates the gate position by the formula in the ROM 23 based on the driving phase and the plate cylinder circumference which are temporarily stored in the RAM 24. . The gate position calculated by the CPU 22 is set in the register adjusting device 4 via the gate position setting device 20. In addition, based on the plate cylinder circumference stored in RAM24, ROM23
The CPU 22 calculates the position of the compensator roller 12 according to the formula. This iPad Compensator Roller
The position of 12 is set in the compensator roller presetting device 2 via the compensator roller position setting device 21.
Then, the motor 14 is driven by the signal from the compensator roller presetting device 2 to move the compensator roller 12. The formulas for calculating the gate position and the position of the compensator roller 12 in the ROM 23 are created based on the principle of the above-described initial adjustment method. In this way, the gate position and the compensator roller position are preset, and the initial adjustment is completed. As described above, according to the present embodiment, when setting the gate position, it is not necessary to confirm each color with an oscilloscope, and the initial adjustment time can be shortened. Further, it is not necessary to remake the plate cylinder as compared with the case of using the automatic gate setting method, and a mark similar to the register adjustment mark is not mistakenly confirmed as the register adjustment mark. It should be noted that in the above embodiment, the registration adjustment mark of each plate cylinder 10
Although the example in which 15 is attached to the printing unit is aligned right beside the center of the plate cylinder 10 is shown, the invention is not limited to this, and it may be attached at any reference position such as directly above the center of the plate cylinder 10. [Advantages of the Invention] According to the present invention, it is not necessary to perform confirmation or the like with an oscilloscope for each color when setting the gate position during initial adjustment, and the initial adjustment of the register adjustment device can be performed easily and easily. Further, compared to the case where the automatic gate setting method is used, it is not necessary to remake the plate cylinder, and it is possible to prevent erroneous recognition of the register adjustment mark.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an apparatus for performing an initial adjustment method of a register adjusting apparatus according to the present invention, FIG. 2 is a schematic view showing an internal structure of the initial adjustment apparatus, and FIG. 3 is an initial adjustment. A diagram showing the principle of the method,
FIG. 4 is a diagram showing a flow chart of an actual initial adjustment method, FIG. 5 is a diagram showing a register adjustment mark and a plate cylinder on a conventional running paper, and FIG. 6 is a register adjusting device of a conventional two-color printing machine. FIG. 7 is a schematic view showing a register adjusting device of a conventional four-color printing machine, FIG. 8 is a view showing a register mark and a plate cylinder on a conventional running paper, and FIG. 9 is a register mark of each conventional plate cylinder. Fig. 10 shows the case where the gate position is set to a predetermined position, Fig. 10 shows a conventional oscilloscope for setting the gate position, and Figs. 11 and 12 show a method for automatically setting the gate position. It is a figure. 1 ... Initial adjustment device, 2 ... Compensator roller preset device, 3 ... Driving phase detector, 4 ... Register adjustment device, 5 ... Pushbutton switch, 6 ... Scanning head,
7 …… plate cylinder circumference input device, 10 …… plate cylinder, 11 …… impression cylinder, 12
...... Compensator roller, 13 ...... Encoder, 14 ......
Motor, 15 …… Register adjustment mark printing section, 16 …… Register adjustment mark, 25 …… Running paper, 26 …… Feed side winding, 27 …… Discharge side winding drum.

Claims (1)

(57) [Claims] The register adjustment marks of each plate cylinder printed on the running paper are detected by the scanning head using a preset gate signal, and each plate cylinder is printed so that the register adjustment marks of each plate cylinder are printed at regular intervals. In the initial adjusting method of the register adjusting device of the multicolor printing machine that moves the position of the compensator roller arranged between them, the register adjusting mark printing section provided on each plate cylinder is aligned with the reference position of the printing unit, Calculate the gate position for detecting only the register adjustment mark for each plate cylinder from the initial phase of the cylinder drive axis and the paper path from the contact between the plate cylinder and the impression cylinder to the scanning head, and based on this calculated value It is characterized in that the position of the gate is adjusted for each plate cylinder, and the position of each compensator roller is adjusted so that the register adjustment marks of each plate cylinder are printed on the running paper at regular intervals. The initial adjustment method of this adjusting device.