JPS6048357A - Printing register adjusting method in multi-color printing rotary press - Google Patents

Abstract

PURPOSE:To perform registering in top and bottom direction and a traverse direction at the point of arbitrary time, by detecting register marks at every picture pattern by an optical sensor, and comparing intervals of the register marks with a set value while performing the phase adjustment and the movement of a plate cylinder corresponding to the difference thereof. CONSTITUTION:Register marks are provided to a printing plate by using a block copy to which register marks 3a-3d each consisting of a horizontal register mark 1 and an oblique register mark 2 are provided corresponding to a number of picture patterns at equal intervals. In the next step, the running distance of paper to the rotation of the motive shaft of a rotary press is displayed as a pulse number by using a rotary encoder. The printed register marks of a printing surface are successively read by an optical sensor and counted pulse numbers corresponding to the distances between the register marks and preset pulse numbers are compared and operated and register mark correction in a top and bottom direction and a traverse direction is performed corresponding to the difference thereof by a phase adjusting mechanism and a plate cylinder moving mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing register adjustment method in a multicolor rotary printing press.

Print registration in multicolor printing using a rotary printing press is one of the important factors in producing a product.

Conventional printing registration involves visually checking the misalignment of the register marks printed on the sample printed material, and determining the amount of misalignment of the register marks at this time.

In the vertical direction, the printing phase of each printing cylinder of the rotary printing press is corrected via a phase adjustment mechanism, and in the lateral direction, the printing phase is corrected via a plate cylinder moving mechanism.

Regarding vertical registration, the vertical registration marks of each color are detected by an optical sensor, and the output timing of this sensor and the same rotation timing as the printing cylinder are set in advance at a position where the vertical registration matches.

When these two timings are out of sync, a method has been used in which a certain amount of correction is made via a phase adjustment mechanism, and the correction is repeated until the timings match.

In the former case of the conventional example above, trial cutting must be repeated several times, which causes problems such as a large amount of wasted paper and a long setup time at the initial stage of printing.
Also, prior to printing, it is necessary to set the sensor output timing to the same rotation timing as the printing cylinder, and this timing requires resetting the pressure every time the diameter of the printing cylinder changes, so the initial setup time for printing is long. I'm afraid there will be a problem.

The present invention has been made in consideration of the above-mentioned problems, and the present invention has been made in view of the above-mentioned problems. Print with the same spacing in the direction, detect each register mark for each pattern with an optical sensor, compare the number of counting pulses equivalent to the interval of each register mark with the preset number of pulses, and calculate the number of pulses. By using the phase adjustment mechanism and plate cylinder moving mechanism to perform vertical and horizontal registration according to the difference, vertical and horizontal registration can be performed at any point in the entire printing process and in an extremely short period of time. It is an object of the present invention to provide a printing register adjustment method for a multicolor rotary printing press that can be performed in a short amount of time.

The embodiments will be described below with reference to the drawings.

First, we will produce a copy of the register Tombo to include in the complete edition of the register Tombo. As shown in FIG. 1, this block copy includes a register mark 3α at one end in the lateral direction, which consists of a horizontal register mark 1 perpendicular to the running direction of one paper and an inclined register mark 2 inclined with respect to the running direction of one paper; 3b, 3cm and 3d are placed at equal intervals, equal to the number of patterns to be printed, for example, four in the case of four-color printing. In this embodiment, the interval between the respective register marks 3α to 3d was 254 mm, the interval between the horizontal register mark and the inclined register mark at the middle of the horizontal register mark was 6.351 Rs, and the slope of the #4 oblique register mark was 45 degrees.

Next, the printing plate of each pattern is made by overlapping the printing plate of each pattern with the printing pattern of this registration mark and inserting the registration pattern mark into each pattern. At this time, a pin system is used to ensure accurate alignment between the printing block of the register mark and the printing block of each pattern.

In FIG. 1, 4 and 5 are the pin holes for the pin system, 6 is the gripping curve, and 7 is the vertical sewing machine position.

8 is a horizontal sewing machine position, 9 is a slitter position, and 10 is a punch register.

As mentioned above, each printing plate for each pattern produced in step 1 contains register marks for four designs, but each printing plate has registration marks that match the pattern, that is, what number to print. Leave the registration mark that matches it and delete the other registration marks. As a result, the 1st picture printed υ1st has the 4 digits shown in Figure 1.
The second register mark 3d is also printed second.
The pattern has the third register mark 3C, and the third pattern below has the second register mark 3b.

The fourth pattern contains the first register mark 3α.

Next, the distance traveled by the paper relative to the rotation of the driving shaft of the rotary printing press is divided by the number of pulses using a rotary encoder. In this embodiment, the distance traveled per pulse is 'r-0,0635
It was tu. This allows the distance traveled by the paper to be expressed in terms of the number of pulses.

The above four patterns are printed sequentially on the 1st to 4th plate cylinders,
After printing, four register marks are printed on the printed surface in the state shown in FIG. S.

The four register marks on the printing surface printed in this way are read one after another with an optical sensor, and the number of counted pulses corresponding to the distance between each register mark is compared with a preset number of pulses and the difference is calculated. Accordingly, the vertical and lateral registers are corrected using the phase adjustment mechanism and plate cylinder moving mechanism.

A specific example will be described below with reference to FIGS. 2 and 3.

First, each register mark is read using an optical sensor IC. For example, how many reference circles are present between reading the first horizontal register mark and the second horizontal register mark?The number As'
k The CPU 12 counts and calculates and compares this counted pulse number A with a set pulse number equivalent to the distance in the paper running direction of each register mark when producing one version.

In this embodiment, as described above, the distance traveled per one pulse of the reference node pulse is set to 0.0635 rss.

Also, since the interval between each register mark is 25-4 iu, the above-mentioned set number of pulses is 400 pulses. The distance between each register mark is also 400/'rus.

Therefore, the count read by the above optical system (the number of pulses and the preset settings) (the number of pulses (400 pulses))
As a result of comparing and calculating, if there is a difference in the number of pulses, this difference means that there is a registration error in the vertical direction between the first and second patterns, and the drive signal for this error is The signal from the vertical driver 14 drives the DC servo motor (or pulse motor) 15, and the phase of the second plate cylinder 17 with respect to the driving shaft 18 is corrected via the differential mechanism (6). be done.

Similarly, the third registration mark for the first registration mark.

In the case of the fourth register mark, the number of pulses A from the horizontal register mark of the first register mark! , count A8,
Compare each pulse number AteAfi with each set pulse number of 800 pulses and 1200 pulses, and if there is a difference,
Correct the difference.

In addition, each of the above comparisons is performed using the distance 1'J[
We have shown an example of counting Jf and comparing the number of argument pulses of Jin and the set number of pulses, but it is also necessary to compare the distance between the horizontal register marks of each pattern and make sure that each interval matches the set number of pulses (40o pulses). You can also do this.

On the other hand, for horizontal registration, the number of pulses B+ between the horizontal register mark and the inclined register mark at the intermediate position of the register mark of each pattern
＋B! + Bs + B4 t” Counted by CPU12, each counted pulse number B+ IB21Bs I
With B4.

The distance in the paper running direction of the intermediate position of each register mark when the block copy is produced is compared with the equivalent set pulse number.

In this embodiment, as mentioned above, the reference curve ■
The running pressure lII per pulse is 0.0635 M,
Further, since the distance between the horizontal register mark and the inclined register mark at the middle of each register mark is 6.35 mm, the set pulse number is 100 pulses.

Therefore, if there is a difference in the number of pulses as a result of comparing and calculating the number of counted pulses in the lateral direction read by the optical sensor and the set number of pulses set in advance, the driver drive signal is set to the predetermined lateral driver 19. The voltage is applied to the DC servo motor (or pulse motor) 20, whereby the plate cylinder which has shifted in the lateral direction is moved by the lateral movement mechanism 2I to achieve registration.

Note that the horizontal registration shown above shows an example in which each registration is aligned with the reference pulse, but this can also be done by aligning the registration marks of other patterns with the first registration mark, as in the case of top-to-bottom alignment. stomach.

In the above embodiment, only one side of the paper, for example, the front side, has been described, but registration can be similarly performed on the back side as well. At this time, the register marks on the front side and the back side are shifted in phase in the paper running direction, as shown in Fig. 4.

The optical sensor II on the front side and the optical sensor l+' on the back side are installed with their positions shifted.

Since the present invention is as described above, it is possible to register each pattern in the vertical and horizontal directions simply by detecting the register marks on the paper being printed using an optical sensor, and to adjust the registration in the vertical and horizontal directions. This can be done at any point in the entire printing process in an extremely short amount of time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the printing plate of the register mark, FIG. 2 is a block diagram showing the register adjustment action, FIG. 3 is a time chart thereof, and FIG. Optical sensor installation form I! ! It is a front view showing l. Applicant Miyakoshi Kikai Seisaku Co., Ltd. Agent Patent attorney Masaaki Yonehara Patent attorney Tadashi Hamamoto Figure 1 4

Claims (1)

[Claims] Horizontal registration marks that are perpendicular to the running direction of the printing paper and inclined registration marks that are inclined to the running direction of the printing paper are printed for each pattern at the same intervals in the printing paper running direction, and each pattern is Each register mark is detected by an optical sensor, and the number of counted pulses equivalent to the interval between each register mark is compared with a preset number of pulses, and the phase adjustment mechanism and plate cylinder are moved according to the difference. A method for adjusting printing register in a multicolor rotary printing press, characterized in that a mechanism performs registration in the vertical direction and in the lateral direction.