JPS60122153A - Printing plate mounting position verification device of multicolor press - Google Patents

Abstract

PURPOSE:To permit a large reduction of the time to be required in registering by verifying and correcting discrepancies in synthesis of a reference mark and a registering mark on a CRT indicator in a multicolor offset press. CONSTITUTION:First of all, on an offset printing plate, a register mark M3 which controls the printing position of a pattern, and register marks M1, M2, in the spaces on both sides of a printing plate are formed. Secondly, the picture signals from photographic devices 14a and 14b in which fields of vision there are the register marks M1, M2, and the picture signals of the reference mark from a reference mark generating circuit 120 are synthesized in a mixing circuit and are displayed on the CRT indicator. An operator who views the display verifies the degree of overlapping of the picture signals and, if any discrepancy was found, he will correct it by perfectly overlapping the pictures of register marks M1, M2 over the reference marks m'<1>, m'<2>. In a manner stated above, registering of printing plates of each printing unit in relation to others becomes feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention checks whether the printing plates attached to the plate cylinder of each printing unit of a multicolor printing press are attached to the correct positions and whether the respective color printing plates are in mutual registration. It is related to the device.

In general, in offset printing, when the printing plate can be placed on the plate cylinder of each printing unit, the position 1jσ is determined by fitting a punch hole provided in the printing plate to a pin protruding from the plate cylinder. Fixing one end of the printing plate (the grip) in a plate vise, wrapping the printing plate around the plate cylinder in this state, and finally fixing the opposite end of the printing plate (the end of the grip). It is attached by

In this case, if the punch holes provided in the printing plate are always easily formed at a certain level with respect to the image, then in principle the relative positioning of the printing plates of each printing unit can be done by positioning the punch holes and pins. However, in reality, it is difficult to always place punch holes in the same position relative to the pattern, and printing the pattern on the printing plate requires positional precision.
Due to various factors such as the installation accuracy of the vise on the plate cylinder H, or the tightness of the printing plate in the vise on the plate cylinder 11, positioning using punched holes and pins may result in printing plate phase 11. There are many cases where people do not have the correct idea.

Therefore, with today's multi-color printing machines, when picking up printing plates, it is necessary to actually perform adjustment printing for registration, and while checking the registration of the printed matter, check for misregistration in the horizontal and vertical directions. &T, It is necessary to stop the IJ remote control or the printing press, adjust the plate vise, make corrections, print it out, and check the results after correction on printed matter. Tsutsumi Furo J is absent.

In this way, with conventional multicolor printing machines, the registration of each printing plate is checked on the printed matter, so it takes a lot of time to adjust the registration, and it also requires a lot of paper for adjustment. There are problems such as whether it is necessary or not.

Recently, as a solution to such problems, as disclosed in Japanese Patent Application Laid-open No. 58-126537, etc.
An automatic drawing machine is used to form register marks for pattern printing on the printing plate and register marks for registering the printing plates with each other using a scribing needle, and after forming the design on the printing plate based on the above-mentioned register mark standards, this printing is carried out. The plates are attached to each plate cylinder in the same way as before, and the printing press is operated in this state to detect the position of the marking mark formed on each printing plate from the preset reference point, and calculate the detected value. An apparatus has been proposed that calculates the amount of deviation in the vertical and horizontal directions from a reference value and automatically drives the plate cylinders independently by the amount of deviation to align each printing plate in register.

Although such a device can solve the above-mentioned problems, its configuration involves a major change in the drive system of the printing press itself, making it quite complex. It is not possible to modify and install the device, so if the user wants the effects provided by the device, he will have to purchase a new printing press with the device, which is very expensive.

This invention was made in view of the above-mentioned prior art, and its purpose is to make it necessary to actually print on printing paper in order to align the printing plates of each printing unit with each other. To provide a printing plate J1y heavy position confirmation device which can easily and quickly confirm the attachment position of a printing plate without causing any trouble, has a simple device configuration, and can be easily attached to an existing printing machine. It is in.

To summarize the present invention, which has been made to achieve the above object, each otomo printing plate, on which register marks of several lines of alignment are formed in the margins of lines on both sides, is printed in 11 units of a plurality of printing units of a multicolor printing machine. A device for checking the position of each printing plate based on the register mark by checking the position of each printing plate based on the register mark, and a fixed position stopping device for stopping each printing unit υ)1 to cylinder at a fixed position i9+; The camera 1 installed in each printing unit is used to read the registration mark on the printing plate taken on the cylinder.
The image captured from the imaging device of each printing unit 4:'+'-''J is compared with the image signal from the switching circuit and the image signal from the switching circuit. a reference mark generation circuit that electrically generates an image signal of a mark that serves as a reference for the process; a mixing circuit that combines the image signal from the switching circuit with the reference mark image signal from the reference mark generation circuit; and a mixing circuit. This is a printing plate attachment position confirmation device for a multicolor printing press, characterized in that it is equipped with a display device that displays a composite image from.

The present invention will be explained below based on embodiments shown in the drawings.

゛Fig. 1 is an explanatory diagram of a sheet-fed four-color printing press, which is the most common type of offset multicolor printing machine, and is equipped with the device according to the present invention, and Fig. 2 is an explanatory diagram of the confirmation device according to the present invention. Fig. 3 is a block diagram of the image processing circuit, Fig. 4 is a block diagram of the reference mark generation circuit, Fig. 5 is an explanatory diagram of reference mark generation, and Fig. 6 is a diagram of the printing machine. This is a block diagram of a circuit that stops the plate cylinder in a fixed position.
Figure 8 is an explanatory diagram of the mark drawing device. Figure 8 is a customs map of Tril 1 version with register marks formed.
Figure 9 shows C) the basis 3 displayed on the table display device.
, 14 marks and an example of the register mark are shown in a clear diagram. , In FIG. 1, 1 indicates an offset sheet S/1 color printing machine, and the printing paper 9 is in the print part 2.
A large number of sheets are loaded, and this mark A+i1. The paper 9 is sent out onto the single-sheet feeder board 3 using a known structure such as vacuum suction, and the printing paper is regulated in position and fed by the noigoo board 3-1- (butter f mini/g is removed:
Four printers are connected in series to send each color to the printing section consisting of L needles.

In the printing section, each printing unit 10.20, ;30, lIO
, the printing of each color of cyan, magenta, yellow "°, and puissoku was transferred from each plate cylinder 11.21.31.41 to each blanket cylinder I:t, 2:3.3:u, 4:3. By retransferring the ink to the printing paper 9 which is wound around each impression cylinder 12, 22, 32, 42 and conveyed, printing is performed in a sequential manner.

The printed printing paper 91 discharged from the final printing unit 40 is delivered to the delivery part 4 via the jaw cylinder 8 by a chain 5 which is passed around a guide wheel 5.5.
The chain 5 is held in the claw of the claw pole attached to 1.
1 σ) The paper is transported to the top of the 4114 table 6 by movement,
The claw rods are also released and the paper is sequentially loaded onto the paper stacking table 6.

In the figure, numeral 7 is a transfer cylinder, which facilitates the transfer of printing paper between the cylinders.

Further, as shown in FIGS. 1 and 2, each mark 11 unit 10.20.30.40 has a plate cylinder J1.21.
Register marks M1 and M2 formed in the margins on both sides of the printing plate wound and fixed on the circumferential surfaces of 31 and 41 (see Fig. 7)
A camera 1 using an imaging device, such as a CCD image sensor, an image pickup tube, etc., is capable of reading the image.
4a and 14b, 24a and 24b, , 34. a and 34
b144a and 44b are attached to the plate cylinder at the same position. This imaging device has register mark N.11,
Since IVI2 is formed in the margins on both sides of the 11th printing plate P, for example, 14a and 14b are printed in one printing unit.
Two units will be installed as shown below.

Furthermore, 51 is a rotary encoder serving as a pulse generating means for generating pulses according to the operating conditions of the printing press, and the pulses from the rotary encoder 51 are used to stop the printing press at a preset position. used.

In this embodiment, the rotary encoder 51 is provided on the impression cylinder 12 of the printing press 1-10, but it is not limited to this position, and may be placed at other locations such as cylinders, plate cylinders, etc. at the operating speed of the printing press. It is also possible to provide a pulse H that corresponds to 1 .mu." or more so that another pulse can be generated.

In addition, 61 is a reference sensor that emits a signal to stop each plate cylinder at a predetermined position. In the example, one rotation of the plate cylinder is detected and the sensor 61Gi detects one revolution of the plate cylinder and emits 1 no (if 'F'f). Therefore, the reference sensor 61Gi prints as shown in FIG. The impression cylinder 12 has the same circumferential length as the plate cylinder 10, and its structure is such that a rotating disk 62 is fixed coaxially with the impression cylinder 12, and a reference hole is provided at the periphery of the rotating disk 62. 64 is formed, and a light emitting/receiving element 63 for detecting this reference hole 64 is provided.
This light emitting/receiving element 63 detects the reference hole 64 (-) and generates one pulse, and then the impression cylinder rotates once (K) and the reference hole 64 reaches the installation position of the light emitting/receiving element 63 and generates a pulse. As a result, a reference signal can be generated every rotation of the plate cylinder.

The reference sensor 61 is not limited to the above-mentioned embodiment in terms of its installation position and configuration, but may be any sensor that can detect 1N rotation of the plate cylinder and generate a signal (see Figure 2). As shown, each printing unit l0120.
30.40 imaging devices 14a and 14b, 24a and 24b
, 34a and 34b, and 44a and 44b are input to the image processing circuit 100, and the image processing circuit 1
The image signal from 00 is CITT display device 15.25.3
5.45 is entered and the image is displayed on the Cit T screen.

On the other hand, as mentioned above, on the printing plate that can be accessed by each plate cylinder of the printing press, there are registration marks M1, ~1, in the margins on both sides.
2 is formed31. of (,1, this mark 1~1, N2
is shown in FIG. Pattern formation] 2nd stage (baking), development, burning snow)
If you don't have any talent, then it's fine.
.

To such register mark - eye, N12 and 1 mark M
1.1, for example, the register shown in Fig. 1.1, for example, according to the automatic drawing device 200. Sister mark white 11 mountain painting 1 song device 2 t
l Drawing table 2 ()7 on which O11 mark control ff L) is placed
ノ'r1'1'l,,゛σ) An X-axis seal 205 is provided at the front and rear, and a Y-axis seal 2 ( ) 4 is attached to this X-axis seal 205. The head 203 is attached to the
By moving the head 20;3 in the Y1li1 direction by the drive motor, the head 203 moves along the plane of the drawing table 207. It is movable.

206 is a punch block, which punches and holds a hole in the part corresponding to the grip of the stamp 1 plate placed on the drawing table, and with this, the printing plate P is fixed on the drawing table. be done. Further, the head 203 is equipped with, for example, a scribing device, and according to a command from the arithmetic and control unit 202, a register mark ~11 for pattern printing of a desired σ) pattern and a predetermined position 11/1 with respect to the register mark M1 are set. The register marks I'v12 and N3 can be automatically formed.

If the registration mark M5 and the register marks M+, N2 are formed using such a register mark automatic drawing apparatus 1 and 200, then each mark N11, N11, N2 will be formed on all printing plates.
12 and N5 can be constant.

Next, the image processing circuit 100 will be explained based on FIG.

Imaging devices 14a, 1 provided in the printing unit 10
The output signal of 4b is inputted to A/D conversion circuits 101a and 101b existing in the block indicated by number 100C and converted into digital signals, and further converted to digital signals.
At 02a and 102b, the signal from the A/IJ conversion circuit 101a is compressed so that it exists only in the left half area of the screen of C It i', which will be described later, and on the other hand, the A/D conversion circuit 11) l b The signal from 4 is compressed so that it exists only in an area corresponding to the left half of the screen.

The image signals from the two compression circuits 102a and IO2+1 are combined in an OR circuit 103, and the combined image signal A is then input to one terminal of an exclusive OR circuit 104. The exclusive OR circuit 104 is responsible for inverting the positive and negative images, and when the switch 105 connected to the other terminal is opened, a negative image signal JI is output in response to the human input image signal, and when it is closed, a positive image 41 is output. −j ”'j is output, IL.

Sounds like (・RUGA, KOυ) omitted in Figure 3 - Bow 1
Circuits exactly similar to the circuits N- present in the block indicated by 00C are arranged in the blocks indicated by numbers 100M, tooY, and 100 corresponding to each printing unit 20.30, /10°. 'The photographing devices 24a and 2
4b, 34a and 34b, 44; t and 441) are respectively
l A/D in Tsuku 100M, 100Y, 100BK
Connected to the conversion circuit.

Therefore, the block 100C outputs an image signal related to the register marks Ml and N2 formed on the printing plate attached to the plate cylinder 11, and similarly
, block 100Y, and block J0013K output image signals related to register marks I'vh and h12 formed on printing plates attached to plate cylinders 21.3I and 4J, respectively.

Such blocks 100Y, 100M, 100L.

The output image signals of 1008 are input to the switching circuit 110, and the switching circuit 110 selectively outputs any one of these image signals. This switching circuit 110
may be of a type in which the operator manually switches the connection terminal and selects the image signal to be output.

Further, the reference mark generation circuit 120 generates a reference mark that is constantly displayed on the C1t'F display device.

To explain this, register mark M1, IV
j2 each "+", r-J, L'), Kono mr image CI (T) If it is displayed on the left and right sides of one screen of the display device, the reference mark will also have the same shape and shape. It will be displayed in size.

Issuing such a reference mark 1-2. For example, a circuit as shown in FIG. 4 may be used, and its configuration and operation are shown in FIG. 5 below. j L, please explain)
. In addition, 1m&;l, 11. algebra, jm
indicates the number of clocks.

First, let's talk about the configuration that generates the vertical line VL that is part of the "1-10" mark.
Vertical line counter 12 with -1,H,) as clear signal
2, count the knock signal CK and set the clock number J2 at the position where the RA line should be generated. :3o compares the count from the counter 122 and the set value 2 from the switch J38, and when the count matches the set value + 2C, a match signal is output from the comparator I:30. do.

By performing this operation for each 1-1°B signal, a vertical line with a thickness of 22 cm from the lagoon part to the return part will be displayed on the crt'r screen. image signals can be obtained.

If it is desired to give this vertical line a certain degree of thickness, it is sufficient to connect a plurality of sets of comparators and switches to the vertical line counter 122 and set the number of consecutive clocks for them.

Since the vertical line thus obtained spans the entire length of the screen in the downward direction, in this embodiment, electrical masking is applied to unnecessary upper and lower portions.

That is, the upper limit counter 123, which uses the vertical blanking signals (V, IJ, ) as a clear signal, outputs the horizontal blanking signals rJ1 . B,, scanning lines) are counted, and the comparator J, 31.
Count number from second limit count 323 and switch 139
The number 11 of the horizontal blanking signal from the top IO on the screen to the position where no vertical line is required is compared with the number 11 set in The Jfλ field line 11 of the unnecessary portion of the Mt line above the 1ifi1 plane can be increased by 11+2. With similar thinking, it is possible to specify the boundary line 15 of the part where the vertical leg of the lower blade of the screen is unnecessary by combining the lower limit counter 124, the comparator 132, and the switch 1400.

The output terminal of the comparator 131 is connected to the J terminal of the JK controller 146, and the output terminal of the comparator 132 is connected to the 1\ terminal of the JK controller 146.
The output of 6 is above the screen (in%
0 in s~i4), center F'tl ni (11~13)
The masking signal becomes ttlnoI. In addition,
V, +3. is input and reset to 1 direct plugging period IU. Compare the masking signal from this JK flip 70 horn as a gate signal.
(The gate circuit 14 sends the image signal that displays the vertical line from 1 to
9, it is possible to display vertical lines VL as shown in FIG.

Next, the horizontal line 1 in the 1-+” mark and the “-” mark
- (To display L, use the horizontal line counter 125I that uses V, 13. as a clear signal, count the number I - 1° at V, H) + 3, and use the comparator 13.
3, the count from the horizontal line counter 125 and tl set by the switch 141. Compare 1S, number + 2,
When both match, the comparator 133 outputs that l-
At 1 and B, a signal is output that makes the image (horizontal line) as shown in Table 7J. This horizontal line is 11-1.8. minute θ) thickness,
If you want to give a certain thickness, use the horizontal line counter]25
A plurality of switches are provided for each switch, each of which has several consecutive 11.1. It is sufficient to set the number of l.

- In this way, 147 is performed (since the yellow-green color spans the entire horizontal length of the screen, electrical masking is applied to unnecessary parts on the left, right and center in this example).

That is, the left limit counter 126, center left counter] 27, and center right counter 1 which are cleared by l-1 and 8 degrees, respectively.
28, and 11-1 at the right limit counter 129. lJ, count the clock signal CK in the period, and combine these counts with the switches 1112.143.144,14
The number of clocks set in "1, J3, Jl,"5
and respective comparators 1; 3, 1.135.136.13
7 and when they match, comparator 1
311, ] 35, I: 30.137 to 30.
The bow outputs J+.

Comparator 1: 34.1; 35υ) output jlj j
-6', l each of JK flip frog 1117.'
W::5 is connected to the I〈terminal, so the output signal of J1\Flizzo Flozo 147 matches the J terminal.''
changed from 〃0〃 to 〃〃 at 11.5 points (~
, l<W:h'1 child matches E3-;'', a masking signal that changes from 1 to tt Q // is obtained.

In addition, the output terminals of comparators 136 and 137 are respectively J
The J terminal of the K flip-flop 1118 is connected to the 1< terminal, and therefore, 11 (the output Ig of the Noritsubu float tag 148 becomes 0 when a match signal is input to the J terminal).
When the match signal is input to the 1 terminal, the masking signal changes from 1 to 1, and returns from 1 to 0. Therefore, the image signal that displays the horizontal line from the comparator 133 is
0, the gate circuit 150 is replaced by the fifth
As shown in the figure, an image signal in which only the area from clock number J1 to 13 is not masked is output, and the image signal displaying the 1j4 line of the Senka conhaler 1:33 is output from the JK flip-flop 148. A gate circuit using the masking signal of
An unmasked image signal is output only in the region from 35 to 35. In addition, J1\Frigg Flossog 1
The reset terminal of 47.148 has 1-1. The image signal from the gate circuit 149.150115] is input to the OR circuit 1 and is reset every 11-1.8 degrees.
52, and the OR circuit generates f as shown in Figure 5.
An image signal of the reference mark of -+jl-J is output.

The display position of a certain rest mark on the screen of the CIT T display device is such that when the printing plate is attached to the plate cylinder in the normal state, the position of the mark on the screen of the CR7 display device P+ is the highest. It is best to set the position to the position where it appears frequently, and for this purpose, it is enough to adjust the setting values of each switch appropriately.

The shape and size of the generated fiducial mark can be changed to the desired shape by changing the setting values of each switch. It can be matched to the shape of the image.

The aforementioned switching circuit] 1 (+ and reference mark generation circuit) 20 are each connected to the mixing circuit 18 (
Receiving horizontal and vertical blanking signals from the switching circuit 110, the image signal of the register mark on the printing plate is combined with the image signal of the reference mark from the reference mark generation circuit 12().

In this actual example, the CI 1' display device for checking the register is installed separately for each printing unit because many current printing presses have a register adjustment operation section for each printing unit. A CRT display device I5.25.35, 45 is provided in the latter CRT display device K, and for this purpose, the composite image signal from the mixing circuit i'180 is amplified by the video amplification circuit 181, and is manually transferred to the latter CRT display device K. Let's do it.

In addition, if the printing machine can adjust the register by central remote control, it is sufficient to have one CIt i' display device in the operation section (in this case, an image increaser is not necessary). .

Further, according to the present invention, the printing press is stopped at a predetermined position and the imaging devices 14a and 14b, 2/Ia and 24b, and 3
4a and 34b, 44a and 44b (7) The reference mark generation circuit 120 takes in the image signal from one of the t deviations of each set, projects it on the C1t'r display device, and displays it in a composite manner.
1 because it is to be compared with the image of the fiducial mark from
．． A configuration is required to stop the printing press at a fixed position.

The position at which the printing press is stopped is determined by the CI (registration marks M1, M
2 are all projected at the same position, and in a normal printing press ('', the phase of the plate cylinder that attaches the printing plate in each printing unit is different -((), and the installation of the imaging device 1
Since the '1 position is constant for each printing unit, there are 4 positions in a one-color printing machine as in this embodiment.

As a method for determining the stop position, for example, using the printing unit 10 as a reference, a) registration marks f'v11, . . .
12 is the imaging device 14a, I41. ＋'s field of view"
(The first stop position is when 7 is on, preferably in the medium heat area, and then υ).
The rotary encoder 51 stores the number of pulses from encoder 5] to σ), and converts the rotary encoder 51 to correspond to the phase shift of each plate cylinder.
) The number of pulses is added to the number of pulses at the first stop position li'1' by 3'1 or (・ is subtracted) to find the number of pulses, and the position corresponding to the number of pulses is set as each stop position. Decided by that-4
-I can do something.

By determining the stop positions in this way, when the printing plates are in register with each other, all the register marks 1 photographed by the imaging device corresponding to each stop position will be
・Images of 11 and 12 are CIt T li! 1iil
The image of the reference mark is displayed at the same position in i'i-.The reference mark image is as described above.
Displayed approximately in the center of the screen.

Bye.

That is, a color/receiver 7] is connected to a rotary encoder 51 which is connected to the impression cylinder 12 via a gear, and this counter 71 counts pulses from the rotary encoder 51 as the printing press rotates. . Each switch 82.
84, 86, and 88 are set with the number of pulses at each stop position previously described, and the comparators 8], 83
．． At 85.87, the number of pulses generated by the counter 71 is compared with the set values of the switches 82, 84, 86, and 88, and when they match, each comparator sequentially outputs a matching signal. Each comparator 81.83
．． 85 and 87 are connected to the printing press stop circuit 72, and the printing press stop circuit 72 is activated when the coincidence 4;
'), and the braking device 91 receives this signal and stops the printing press.

Although not shown in the figure, there are of course switches and circuits for releasing the stoppage of the printing press, starting operation of the printing press (11), and starting the operation.
Repeating stops is uJ's ability.

In addition, sensors 6j and 11f are connected to the counter 71, and the signal from the reference sensor 61 is input to the counter 71 as a clear signal, and the counter 71 is cleared by one revolution of the plate cylinder. (It has become a composition (・ru.

Next, using the above-mentioned 47 (C recognition device), we will explain how to pick up and check the position of each printing press attached to the plate cylinder of the printing press, and how to repair the position after the confirmation.

First, as already mentioned, on the Onocent printing plate, the registration mark automatic drawing device as shown in Fig. 7 is used to control the printing position of the image. Used to align the printing plate phase JL above J+, 7), 1,1. This mark M1
, M2 are formed on each printing plate so that there is no misalignment between the positions 11 and 11111.1. (See Figure 8) Each of these printing plates is then formed with a pattern of each color through processes such as printing and development, and then placed on each printing unit (10, 20, 30, 40θ) of the printing press on the plate cylinder. It is removed and fixed using normal methods.

After this, the printing press is rotated at low speed and medium speed without passing the printing paper.

In the fixed position stop circuit, when the reference position is detected by the reference sensor 61, the contents of the counter 7] are cleared, and the counter 7] starts counting pulses from the rotary encoder 51 anew. When the value matches one of the preset pulse numbers, first stop the printing press.

In this stopped state, the switching circuit 120 is switched to capture image signals from the imaging devices (for example, imaging devices 14a and 14fi) in which the register marks +Vh and M2 are in the field of view, and the switching circuit 120 is switched to capture the image signals from the image signals and the reference mark generation circuit 120. The image signal of the reference mark is synthesized by a mixing circuit, and the CRT
It is displayed on the display device 1"11'.

The state of this display is shown in FIG.
'j, m'2 and &-, 4r, both images 1111, m2 of the mark from one imaging device are displayed. The operator checks the degree of overlap between the two, and if they are completely aligned, the operator maintains that condition, and if they are misaligned, the correct registration mark is formed. If you want to know the name of the printing plate or the printing plate, finely adjust the plate cylinder using a known adjustment means to obtain both images of this mark.
+, +112 are completely adjusted to the reference mark +11'+, ■1].

After completing the above operation, printing again (4) When the low speed rotation is turned on, the circular printing press stops when the count 111'l of the counter 7J matches one of the set pulse numbers. Even at this stop position, perform the same confirmation work as in the first stop 11.5.

By performing such operations for all printing plates at all stop positions, the images of the register marks of all printing plates displayed on the "cIt'i" screen-1- at each stop position will be based on 1. By pressing, rolling, and kneading to completely overlap the image of the '- mark, it is possible to align the printing plates of each printing unit with each other.

In addition, if the reference mark or register mark displayed on the CR'1' display unit is displayed in reverse, the above-mentioned confirmation work can be carried out more easily. I can do it.

The above is a description of one embodiment of the present invention, and the present invention is not limited to the above embodiment in any way.

In other words, although the explanation was given using an offset sheet-fed four-color printing press as an example, Sen's Offset Taotau 111 QS
, for example, an offset rotary printing press.

In addition, the shape of the register mark provided on the Ajil 1 version is [+
−]1−-”, rZJ r=”l
Any mark that can detect vertical displacement, horizontal displacement, or twist, such as J rjj, may be used.

In addition, in this embodiment, one side of the CRT display device is divided into left and right sides.
Although the register marks 11 and 12 are divided and displayed on one screen, they may be displayed on separate cuirT display devices. In this case, a compression circuit or the like is not required.

This invention is based on the above-described Ura R) and the Elf printing plate phase Hσ) V11 of the offset multicolor printing press.
, the reference mark and the register mark are successively synthesized and displayed on the screen of the display device C1, and the position of each printing plate σ) is confirmed by adjusting the degree of distortion of the marks of L, L, etc. by 1.1. 3.11 on the printing plate is not correct, check this CIt 'l' screen to make sure the register mark overlaps the reference mark a), the adjustment amount/1 elephant υ] print The register can be easily adjusted by adjusting the plate by remote control or the like.

Therefore, compared to the conventional method, the time required for registering the printing plate is reduced to approximately 11 J, and there is no need for printing paper for registering.

Furthermore, the confirmation device according to the present invention can be installed in an existing printing press to 1/1" size without changing its basic structure, making it possible to effectively utilize the existing printing press.
It is extremely practical and has excellent effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 shows a general sheet-fed four-color printing machine as an offset multicolor printing machine equipped with the device according to the invention. FIG. 2 is an explanatory diagram of the confirmation device according to the present invention, FIG. 3 is a block diagram of an image processing circuit, FIG. 4 is a block diagram of a reference mark generation circuit, and FIG. The figure is an explanatory diagram of reference mark generation.
Fig. 6 is a block diagram of a circuit for stopping the plate cylinder of the Mark 11i11 machine in a fixed position, Fig. 7 is an explanatory diagram of the register mark drawing device, and Fig. 8 is a printed image with register marks formed. This is an explanatory diagram of the version, and Figure 9 is C
It is an explanatory diagram showing an example of a mark and a register mark displayed on a display device. 11... Plate cylinder 14a, 14b... Imaging device 15
...CRT 51 ...Rotary echo/coder 6
1...Reference sensor 100...Picture '11 Hori circuit M1.1ν12...Register mark +111,!l
'12...CIL T art dealer table/1
\JtTajZanjunθ)-7-riP...Print version special i + 'l appearance + ``1 person Toppan Printing Co., Ltd. Publication Representative and Kazu Suzuki No. 61゛4 in Figure 5 C Figure 7, Figure 8, Figure 9] 5

Claims (1)

[Scope of Claims] ■) A plurality of multi-color printing presses, each of which is a printing plate of each color, in which register marks for mounting position alignment are formed in the margins on both sides. A device for confirming the position of each printing plate based on 1.
. a fixed position stop device for reading the register mark on the printing plate attached to the plate cylinder; A switching circuit that outputs one image signal, and an image of a mark that serves as a reference for comparison with the image signal from the previous ifc: I, IJ switching circuit.
a reference mark generation circuit that electrically generates a reference mark generation circuit; a mixing circuit that electrically generates a reference mark image signal from the switching circuit; A display device for displaying a composite image from the circuit (1iij is 7t, r sign and -4-
A device for confirming the position of the printing board on a multi-color printing press.