JPH06171069A - Method and device for automatic registration adjustment - Google Patents

Abstract

PURPOSE:To enable a adjustment to be made flexibly to deal with a change in the position of a register mark so that a mark detection means is not in the way of operation and maintenance services, in an automatic registration adjustment device which adjusts registration on a multi-color printer. CONSTITUTION:The automatic registration adjustment device consists of register marks 21 provided on a printing plate surface, a laser beam output part, a means for deflecting a laser beam and a means 31 for detecting a mark with a light receiving part. A reference signal is output at a specified rotary phase of a printing plate cylinder 11. In addition, the device is composed of a rotary encoder 51 which outputs a rotation synchronization signal each time the specified angle of the printing plate cylinder 11 is displaced, and a control means 61 which calculates a registration adjustment value based on an output signal from the means 31 for detecting a mark and an output signal from the rotary encoder 51 and outputs an adjustment activation signal to means 14, 15,16 for adjusting registration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic register adjusting method and an automatic register adjusting method for detecting a register mark on a printing plate mounted on each plate cylinder of a multicolor printing machine and adjusting the register based on the detected position. Regarding the device.

[0002]

2. Description of the Related Art In a multi-color printing machine, a desired color image cannot be obtained unless the printing positions for the respective colors are completely the same, so the printing register for each color is adjusted.

As a method or apparatus for automatically adjusting the printing register of multicolor printing, there are a type of automatically adjusting by detecting the position of a printed register mark, and a position of the register mark on a printing plate mounted on the plate cylinder. There is a type of detecting and automatically adjusting, and the latter is effective in reducing the printing waste paper. For example, Japanese Patent Publication No. 55-25062.
Japanese Patent Publication No. 3-38110, Japanese Patent Publication No. 3-75344, Japanese Patent Publication No. 4-16343, and Japanese Patent Laid-Open No. 62-71.
The one disclosed in Japanese Patent No. 655 is known.

The one disclosed in Japanese Examined Patent Publication No. 55-25062 is one in which a plate cylinder is rotated and a printing plate mounted on the plate cylinder is
In the device for detecting the two lines of the register mark consisting of the horizontal line and the diagonal line, obtaining the distances from the reference position to the respective lines, and adjusting the register so that the respective distances are proper, the mark detecting means comprises: It consists of a projector and a receiver and is installed near the plate cylinder. The twist is calculated from the deviation of the distance from the reference position of the register marks at the four corners of the printing plate.
Adjusted.

In Japanese Patent Publication No. 3-38110, a plate cylinder is rotated to detect the two sides of a register mark having a lateral side and a hypotenuse on a printing plate mounted on the plate cylinder. A device for determining the time from the reference position until each side is detected, and adjusting the registration so that each time is appropriate. The mark detection means forms a light beam as a spot through the lens system to the plate. It has a light projecting means for irradiating to and a light receiving element for receiving the reflected light, and is provided so as to approach the plate cylinder and face each of the register marks. Further, in order to improve the accuracy of mark detection, an automatic gain control circuit is used for outputting a detection signal.

In Japanese Patent Publication No. 3-75344, a target position (coordinates) is set for each of a plurality of register marks (registers) of a printing plate, and the plate cylinder is rotated and mounted on the plate cylinder. A device for detecting the actual positions of a plurality of register marks on the printing plate, obtaining the deviation from the target position, and performing register adjustment so that this deviation disappears. It is provided so as to be movable along a horizontal bar facing each other and parallel to the axial direction of the plate cylinder.

The one disclosed in Japanese Patent Publication No. 4-16343 has a register mark having a new metal surface exposed by scraping off the surface of the printing plate, and a large difference in light reflectance between the register mark and other portions. And the register mark detection accuracy is improved. The plate cylinder is rotated to detect the two lines of the register mark consisting of horizontal lines and diagonal lines on the plate attached to the plate cylinder. The mark detection means is a method of obtaining the distances from the reference position to the respective lines and adjusting the registration so that each distance becomes an appropriate one.
It is installed close to the plate cylinder. Further, the twist is obtained and adjusted from the deviation of the distance from the reference position of the register mark on the printing plate provided separately in the left-right direction.

Japanese Patent Application Laid-Open No. 62-71655 discloses a plate of a printing plate in which two register marks in the shape of a right-angled isosceles triangle are made to coincide with each other in the vertical bisectors of the bottom sides of the respective marks. Provided near the head and plate bottom respectively, rotate the plate cylinder, detect one bottom side and the hypotenuse of two register marks on the plate attached to the plate cylinder in sequence, and measure the distance from the reference position to each side. The mark detection means is provided close to the plate cylinder.

[0009]

The known techniques described above have the following problems to be solved. 1. In any of the known techniques, since the mark detecting means is provided at a position close to the plate surface, that is, a position close to the plate cylinder, work such as attachment / detachment of the plate and removal of dust on the plate,
It hinders operation and maintenance.

2. In any of the known techniques, it is necessary to provide the mark detection means for each plate cylinder, which is wasteful in terms of manufacturing cost. 3. Except for the one disclosed in Japanese Patent Publication No. 3-75344, the mark detection means is fixedly installed, so that the position where the register mark is provided depends on the size of the printing material used and the composition of the printing line. Cannot be dealt with effectively when is changed on the printing plate. In addition, it is 3-753
The one disclosed in Japanese Patent No. 44 can deal with the above by moving the mark detecting device along the horizontal bar, but it is necessary to provide a mechanism for moving each mark detecting means, which makes the vicinity of the plate cylinder complicated. By moving each mark detection means, an error is likely to occur in the detection position of each mark detection means with respect to the register mark, and the accuracy of register adjustment decreases.

4. In addition, in the one disclosed in Japanese Patent Publication No. 3-38110, since the automatic gain control circuit is adopted, the circuit for outputting the mark detection signal becomes complicated. Further, in the method disclosed in Japanese Patent Publication No. 4-16343, a means for processing the register mark on the printing plate surface is required, and the adjustment accuracy is lowered due to an error in the processing position of the register mark. There are also inherent problems in each of the known techniques.

According to the present invention, the mark detecting means does not interfere with the work such as the mounting and demounting of the printing plate, the number of the mark detecting means is reduced, and the position of the register mark can be flexibly dealt with. The purpose is to be able to adjust the register.

[0013]

In order to solve the above-mentioned problems, the present invention can reduce the spot diameter as a light source of the mark detecting means, have a large illuminance, a large depth of focus, and a disturbance light. The main feature is to use a laser beam that is not easily affected.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 2 is a detailed explanatory diagram of a plate cylinder portion and mark detecting means. Since the details will be described later, the principle will be described here. In FIG. 1, 11 is a plate cylinder, 13 is a printing plate attached to the plate cylinder, 14 is a circumferential register adjusting device, 15 is a lateral register adjusting device, 16 is a twist adjusting device, 21 is a register mark, and 31 is a mark. Detecting means, 32 is a laser beam output section, 37 is a light receiving section for receiving the reflected light from the plate surface of the laser beam, 41 is deflection means for deflecting the laser beam to the register mark detection position, 51 is a rotary encoder, and 61 is control means. Shows.

The register mark 21 is made up of all or a part including at least two sides except the base of the triangle. Further, two register marks 21 are provided on the plate surface so as to be separated from each other, and the respective bottom sides thereof are arranged in parallel to each other and substantially in parallel to the side edge of the plate.

The mark detecting means 31 comprises a laser beam output section 32, a deflecting means 41 for deflecting the laser beam to a register mark detecting position, and a light receiving section 37 for catching the reflected light of the laser beam on the plate surface.

The rotary encoder 51 synchronizes with the rotation of the plate cylinder 11 and outputs a rotation synchronization signal for each predetermined angular displacement of the plate cylinder 11, and a reference signal output means for outputting a reference signal in a predetermined rotation phase of the plate cylinder. And a synchronization signal output means.

The control means 61 counts the rotation synchronizing signal based on the reference signal and the detection signal of the mark detecting means 31, calculates the register adjustment amount from the counting result, and adjusts each of the adjusting means 14, 15 ,. An adjustment operation signal is output to 16.

[0019]

When the laser beam is applied to the register mark detection position of one of the register marks 21 while rotating the plate cylinder 11, the mark detecting means 31 detects the two sides of the register mark other than the bottom side due to the intensity change of the reflected light. To do. Then, the deflection direction of the laser beam is changed, and the other register mark 21 is detected in the same manner. The control means 61 calculates the position of the intersection of the two sides of each register mark with respect to the plate cylinder at the detection timing (the number of pulses of the rotation synchronizing signal from the reference signal to the detection) of the two sides excluding the bottom side. Specifically, the position in the circumferential direction of the intersection of the two sides of the mark is calculated by the detection timing of the two sides excluding the bottom side, and the position of the two sides of the mark is detected by the detection timing of the two sides excluding the bottom side. The left-right position of the intersection is calculated. After calculating the positions of the intersections of the two sides of the two register marks with respect to the plate cylinder, the calculated positions are compared with the standard position of the intersections of the two sides of the register marks, and the register is adjusted in the circumferential direction. The value, the lateral register adjustment value, and the twist adjustment value are calculated, and an adjustment operation signal is output to each adjusting means 14, 15, 16. Each of the adjusting means 14, 15, 16 executes register adjustment in the respective direction, and register adjustment of the printing plate surface is executed. In a multi-color printing machine, the standard position of the intersection of the two sides of the register mark is set so that the printing positions on the printing paper for each color match, so that the registration of each plate cylinder is based on the standard position. If the adjustment is made, the print positions on the print paper for the respective colors finally match, and a desired color image is obtained.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an embodiment of the present invention,
FIG. 2 is a detailed explanatory view of the plate cylinder portion and the mark detecting means.

Reference numeral 1 denotes a multi-color printing machine in which four BB type printing machines 3 capable of printing on both sides of a running paper 2 running substantially horizontally are connected. In the BB type printing machine 3, two blanket cylinders 12 each having a plate cylinder 11 provided side by side are provided at the upper and lower sides so that they can come into contact with each other.
The printing plate 13 mounted on the plate cylinder 11 is used for running paper that travels between
Is printed through the blanket surface of the blanket cylinder 12.

Each plate cylinder 11 is provided with a circumferential direction register adjusting means 14, a lateral direction register adjusting means 15, and a twist adjusting means 16 for adjusting the register of the image lines. Each adjusting means has a known mechanism, and the pulse motors 14a, 1
Driven by 5a and 16a (see FIG. 2), the plate cylinder 11 is slightly moved in the adjustment direction. Incidentally, in FIG. 1, in order to avoid making the drawing complicated, each adjusting means 14, 15, 1
6 together with each pulse motor B-
It is shown below the B-type printing machine 3.

The plate 13 mounted on the plate cylinder 11 is provided with two register marks 21. The register mark 21 has a shape, for example, as shown in FIGS.
That is, the apex 21b facing the base 21a is on the vertical bisector of the base 21a, and the height 21c is the length 21 of the base.
2 sides 21e, 2 of the triangle that is equal to d, excluding the base 21a
It consists of all (see FIG. 10) or part (see FIGS. 11 to 12) including at least 1f. The two register marks 21 are substantially parallel to the side edges 13a of the printing plate 13 so that their respective bottom sides 21a are parallel to each other. (Meaning that it includes a slight inclination), and further as shown in FIGS. 13 to 15,
And are separated from each other in the left-right direction.

Further, the running paper 2 usable in the multicolor printing machine 1
Has a width of LMAX to LMI as shown in FIG.
There are several numbers between N and the register marks 21 of the printing plate 13 are, for example, 21X and 21N in FIG.
It is provided at a position approaching the side edge 2a of the running paper 2 as described above.

On the other hand, each BB type printer 3 is provided with mark detecting means 31 for detecting the register mark 21. The mark detection means 31 is a HeN that outputs a laser beam for detection, as shown in FIGS. 3 and 4, for example.
e Laser beam output unit 32, laser beam output high-voltage power supply 33, focus adjustment lens 34 for adjusting the focus of the output laser beam, beam splitter 35 that splits the reflected light of the laser beam into the light receiving side, and beam splitter 35 It has a condenser lens 36 for condensing the divided reflected light, a photoelectron multiplier tube 37 which is a light receiving tube for receiving the condensed reflected light, and an amplifier 38 for amplifying the signal output by the photoelectron multiplier tube 37. And further,
The laser beam whose focus has been adjusted by the focus adjusting lens 34 is a predetermined position for detecting the register mark 21, in this embodiment, a line CL1 that bisects the register mark 21 at the standard position in the left-right direction. , CL2 (see FIGS. 2, 8 and 9) is provided with a deflecting means 41 for deflecting the irradiation.

The deflecting means 41 comprises a deflector 42 and a deflector 42.
It has a deflector driver 43 which outputs an operation signal.
As in the embodiment shown in FIG. 1, one BB type printer 2 is used.
When the common mark detecting means 31 is provided for the printing plates 13 mounted on the one plate cylinder 11, the deflector 42 is arranged so that the deflector 42 can deflect in two directions which are orthogonal to each other as shown in FIG. And two left and right deflectors 4 for each plate cylinder
2a are provided. Although not shown in the figure, when the mark detecting means 31 is provided separately for each of the two plate cylinders 11 of one BB type printer 3, the deflector 42 operates as shown in FIG. Since it suffices to be able to deflect in a direction parallel to the axis line of, there is only one left and right deflector 42a. The deflector driver 43 has a deflection amount holding unit (not shown) that stores and holds the deflection amount of the deflector 42.

Further, the plate cylinder 11 has reference signal output means for outputting a first reference pulse BP1 which is a reference signal in a predetermined rotation phase of the plate cylinder 11, and the plate cylinder 11 in synchronization with the rotation of the plate cylinder 11. A synchronization signal output means for outputting a synchronization pulse SP which is a rotation synchronization signal is provided for each predetermined angular displacement, for example, for each 0.015 degree angular displacement. In the embodiment shown in FIG. 1, a rotary encoder 51 is provided which is a combination of a reference signal output means and a synchronization signal output means. The rotary encoders 51 may be provided so as to correspond to each of the plate cylinders 11 one by one, or, since the eight plate cylinders 11 interlock in a predetermined relationship, One may be provided in correspondence with each other.

Further, a circumferential direction register adjusting means 14, a lateral direction register adjusting means 15, which are provided for each plate cylinder 11, respectively,
A control means 61 for controlling the operation of the twist adjusting means 16 and the deflecting means 41 is provided.

The control means 61 is linked with the mark detecting means 31, the rotary encoder 51 in which the reference signal outputting means and the synchronizing signal outputting means are combined, and the circumferential direction adjusting means 14, the lateral direction adjusting means 15, Twist adjusting means 16 and respective pulse motors 14a, 15a, 1
6a are linked. In addition, the control means 61 is shown in FIG.
And the detection signal output from the mark detecting means 31, which is configured as shown in FIG. 6 (FIGS. 5 and 6 together constitute one drawing), and the first reference pulse BP1 (see FIG. 7). , And several synchronous pulse counters CNT1 to CNT3, CNTP1, CNTP2, which are activated or deactivated by some signals output in relation to these signals.
A calculation position 21b '(see FIG. 8) of the apex 21b of the register mark 21 is obtained based on the counting result of the synchronization pulse counting section, and a horizontal deviation e between the two register marks e with respect to the calculation position 21b'.
1 and several deviations e2 in the left-right direction with respect to the vertex 21B of the register mark 21 at the standard position and deviations e3 in the circumferential direction (see FIG. 9) are calculated by several calculation units 63a to 63d and calculation units 63a to 63d. Based on the result, pulse motor control drivers 64a, 64 for outputting operation signals to the pulse motors 14a, 15a, 16a
b, 64c, and a timing generation circuit 65 which outputs predetermined timing signals T1 to T7 based on the counting result of the synchronization pulse counting section 62, and a synchronization pulse for the position of the apex 21B of the standard position register mark 21. Holding unit 6 that holds the coordinate value associated with the counting result of the counting unit 62
6a, 66b and some other holding portions 66c to 66f
Have. Further, an operation signal can be manually output to each unit linked to the control unit 61 via the control unit 61, and data to be held in the holding units 66a and 66b or a deflection amount holding unit (not shown) can be input. The operation unit 67 (see FIG. 1) is provided.

In FIG. 1, the control means 61, the mark detecting means 31, the rotary encoder 51, the circumferential direction register adjusting means 14, the left and right register adjusting means 15, and the twist adjustment are shown in order to avoid making the drawing complicated. Regarding the linkage with the means 16, only one BB type printer 3 is shown, but the control means 61 also links with the other three BB type printers 3 in the same manner.

Next, regarding the register adjustment by the above configuration,
This will be described with reference to FIGS. 5 to 9. In the following description, the reference numerals of the two register marks 21 are 211 respectively.
And 212. In addition, all register marks shall be solid.

The register marks 211 and 212 are provided at predetermined positions by plate making. Register mark 2
Printing plates 1 and 11 and 212 are provided at predetermined positions.
3 is finished to a predetermined size, and the printing plate 13 is a plate cylinder 11.
Assuming that it is installed in the proper position in the
The printing position of the plate cylinder 11 is aligned with the printing position of the other plate cylinder 11. The positions of the register marks 211 and 212 at that time are defined as the standard positions of the register marks 211 and 212.

8 and 9 are explanatory views of register adjustment.
In the figure, the triangle shown by the two-dot chain line is the standard position of the register mark, the triangle shown by the solid line is the actual position of the register mark, and the triangle shown by the broken line is the virtual position of the register mark obtained from the signal detected by the mark detecting means. Show. For any one of the standard position register marks 211 and 212, for example, for the register mark 211, the vertex 211B of the vertex 211B is x with respect to the reference position B1.
Determine the coordinates and the y coordinate. The reference position B1 and the x coordinate,
The method of determining the y coordinate will be described later.

In addition, the register mark 21 at the standard position
1, 212 left and right bisectors, that is, positions for detecting the register marks 211, 212 (line CL shown in FIG. 2).
1, CL2), and the deflection amounts θ1, θ2, θ by the deflector 42 for irradiating the laser beam on this line.
3 and θ4 are determined.

Then, the operating portion 67 is operated to input the x-coordinate and the y-coordinate of the apex 211B at the standard position and the deflection amounts θ1, θ2, θ3 and θ4 by the deflector 42, and the coordinate values are controlled by the control means 61. Of the deflector driver 43 via the control means 61.
It is held by a deflection amount holding unit (not shown). The deflection amounts θ1, θ2, θ3, and θ4 may be input by manually operating the deflector 42 to irradiate the laser beam to the detection position and hold the deflection amount at that time.

The printing plate 13 is mounted on the plate cylinder 11, and the multicolor printing machine 1 is operated with the running paper 2 not being threaded. Then, the plate cylinder 11 rotates, and the rotary encoder 51 linked to the plate cylinder 11 causes the synchronization pulse S which is a rotation synchronization signal.
P and a first reference pulse BP1 which is a reference signal are output.
When the plate cylinder 11 has a predetermined rotation phase, the first reference pulse BP1 has a rotation phase in which, for example, the plate mounting portion 11a (shown only in the perspective portion of FIG. 1) is located at the right end as illustrated. Sometimes it is set to be output.

With the plate cylinder 11 rotated, the operating portion 67
This activates the control means 61 and each means associated therewith. The deflection unit 41 operates the deflector 42 according to the deflection amount held in the deflection amount holding unit, and the laser beam output from the laser beam output unit 32 detects a position for detecting the register marks 211 and 212. For example, the lines CL1 and CL2 in FIG. 2 are sequentially irradiated as described later. As shown in FIG. 13, the register marks 211 and 212 are printed on the plate 1.
3 is provided only in the vicinity of one side edge, the predetermined position for detecting the register marks 211 and 212 is the line CL.
In the case where only one of the mark detection means 31 is provided for each of the two plate cylinders 11 of the one BB type printing machine 3, one of the mark detection means 31 and the CL2 is provided. As mentioned above, there is no bias.

The reference position B1 for detecting the register marks 211 and 212 is determined as follows. That is, the reference position B1 is the point where the laser beam is emitted when the plate cylinder 11 is rotated while the laser beam is being emitted and the rotary encoder 51 outputs the first reference pulse BP1.

The x-coordinate and y-coordinate of the vertex 211B of the register mark 211 at the standard position (hereinafter referred to as "standard position vertex 211B") with respect to the standard position B1 are the standard position B1.
From the standard position to the apex 211B at the standard position in the left-right direction and the circumferential direction, and are determined by converting them into the number of outputs of the synchronization pulse SP.

5 and 6 are register adjustment control circuit diagrams, and FIG. 7 is a timing chart relating to the circuits shown in FIGS. The plate cylinder 11 is rotated while the laser beam is irradiated on the line CL1, and the first reference pulse BP1 is output. When the first reference pulse BP1 is output, OR
The flip-flop FF1 is inverted by being input to one gate, the counter CNT1 becomes countable, the synchronization pulse SP is counted, and the flip-flop FF is also counted.
2, the counter CNTP1 becomes countable, and the synchronization pulse SP is counted.

When the plate cylinder 11 rotates and one side a of the register mark 211 reaches the irradiation position of the laser beam, the mark detecting means 31 detects this and its output is H.
It becomes IGH, this output is input to the AND1 gate, the differential pulse α1 is output, and the flip-flop FF4 is inverted. By the inversion of the flip-flop FF4, the counters CNT2 and CNT3 can count, and the counter CNT2 counts the halved sync pulse SP and the counter CNT3 counts the sync pulse SP as it is. Also the differential pulse α
The output of 1 causes the flip-flop FF1 to be non-inverted, and the counter CNT1 stops counting.

When the plate cylinder 11 further rotates and the other side b of the register mark 211 reaches the irradiation line of the laser beam, the mark detecting means 31 detects the end of the register mark 211 and its output becomes LOW. The differential pulse α1 is output by this output and is input to the OR2 gate to make the flip-flop FF4 non-inverted. When the flip-flop FF4 becomes non-inverted, the counters CNT2 and CNT3 stop counting.

Further, the signal in which the flip-flop FF4 is non-inverted is input to the AND2 gate and the differential pulse α
2 is output and input to the terminal ST1 of the timing generation circuit 65. With this input, the timing generation circuit 65 outputs the pulse T1. When the pulse T1 is output, x of the apex 211B at the standard position held by the holding unit 66a.
The coordinate Sx and the count value Lx of the counter CNT3 are calculated by the calculation unit 63a, and the difference Zx between them is output. Further, the pulse T1 is input to the OR3 gate, and the counter CN
The count value of T1 and the count value of the counter CNT2 are calculated by the calculation unit 63b and the sum is output as Ly, and the output value Ly and the y coordinate of the vertex 211B of the standard position held by the holding unit 66b. Sy is the calculation unit 63
It is calculated by c and the difference Zy is output. Then
The pulse T2 is output and the count value L of the counter CNT3
x is the x coordinate of the apex 211b ′ at the arithmetic position of the register mark 211 (hereinafter referred to as “apex 211b ′ at the arithmetic position”), and the output value Zx of the arithmetic unit 63a is adjusted to the left and right in the arithmetic vertex x coordinate holding unit 66c. As the data, the left / right adjustment data holding unit 66d stores the output value Zy of the calculation unit 63c.
Are stored in the circumferential direction adjustment data holding unit 66e as the circumferential direction adjustment data, respectively.

Next, the pulse T2 is input to the OR4 gate, the differential pulse α3 is output, and the counter CNT
2, CNT3 is cleared and differential pulse α3 is O
The counter CNT1 is cleared by being input to the R5 gate.

Subsequently, the plate cylinder 11 rotates and the counter C
When it is confirmed that the count value of NTP1 has reached the predetermined value set in advance in the data switch DSW1 by comparison in the comparison unit COMP1, the differential pulse α2 is output. This differential pulse α2 is hereinafter referred to as the second reference pulse BP2.

The second reference pulse BP2 causes the flip-flop FF2 to be non-inverted, whereby the counter CNT is
P1 is cleared, and the second reference pulse BP2 is O
The counter CNT1 is input to the R5 gate to clear it, and the second reference pulse BP2 is input to the OR1 gate to invert the flip-flop FF1 to enable the counter CNT1 to count and count the synchronization pulse SP. Further, the second reference pulse BP2 inverts the flip-flop FF3, which causes the counter CNTP to
2 becomes countable, and the sync pulse SP is counted.
In addition, since the flip-flop FF3 is inverted,
The deflector driver 43 is activated and the deflector driver 4
3, the deflector 42 (left and right deflector 42a) is activated, and the laser beam is moved from right to left, that is, from line CL1 to line CL2 in FIG. During this movement, the output from the amplifier 38 of the mark detecting means 31 is stopped.

When the side edge c of the register mark 212 reaches the laser beam irradiation position as the plate cylinder 11 continues to rotate, the mark detecting means 31 detects this and the output becomes HIGH, and this output becomes AND1 gate. To the flip-flop FF4.
Invert. By inverting flip-flop FF4,
The counters CNT2 and CNT3 become countable, and the counter CNT2 recounts the halved sync pulse SP and the counter CNT3 recounts the unchanged sync pulse SP. Further, the output of the differential pulse α1 causes the flip-flop FF1 to be non-inverted, and the counter CNT1 stops counting.

When the plate cylinder 11 further rotates and the other side portion d of the register mark 212 reaches the irradiation position of the laser beam, the mark detecting means 31 detects the end of the register mark 212 and its output becomes LOW. With this output, the differential pulse α1 is output and input to the OR2 gate, and the flip-flop FF4 is non-inverted. When the flip-flop FF4 becomes non-inverted, the counter CNT2
And the counter CNT3 stops counting.

Subsequently, the plate cylinder 11 rotates and the counter C
When it is confirmed that the count value of NTP2 has reached the predetermined value set in advance in the data switch DSW2 by comparison in the comparison unit COMP2, the differential pulse α3 is output. The differential pulse α3 causes the flip-flop FF3 to be non-inverted, the counter CNTP2 is cleared, and the differential pulse α4 is output and input to the terminal ST2 of the timing generation circuit 65. With this input, the timing generation circuit 65 outputs the pulse T3.
This pulse T3 is input to the OR3 gate, and the operation vertex x
The vertex 211 of the calculation position held by the coordinate holding unit 66c
x-coordinate Lx of b'and re-count value L of counter CNT3
x'is calculated by the calculation unit 63d, and the difference e1 is output. Next, the pulse T4 is output, and the calculation unit 63
The output value e1 of d is held in the twist adjustment data holding unit 66f as the twist adjustment data. Also, pulse T4 is O
The differential pulse α3 is output by being input to the R4 gate, and the counters CNT1, CNT2, CNT3 are cleared.

Next, the pulse T5 is output and the left / right adjustment data Zx held in the left / right adjustment data holding unit 66d,
Whether or not the circumferential direction adjustment data Zy held in the circumferential direction adjustment data holding unit 66e and the twist adjustment data e1 held in the twist adjustment data holding unit 66f are included in predetermined ranges respectively. Is confirmed by the confirmation unit 68.

Then, the pulse T6 is output. Then, although not shown in the control block diagram, any of the following three controls is performed. That is, when all of the left-right adjustment data Zx, the circumferential adjustment data Zy, and the twist adjustment data e1 are included in a predetermined range, the adjustment pulse motor control drivers 64a, 64b, 64c
At the same time, the adjustment data “0” is input, and the end of the automatic register adjustment is notified through an appropriate means, for example, a display unit (not shown) attached to the operation unit 67.

When the twist adjustment data e1 is not included in the predetermined range, for example, in the state shown in FIG. 8, the twist adjustment data e1 is adjusted by the twist adjustment pulse motor control driver 64c. Pulse motor control driver 64a
The adjustment data “0” is input to the pulse motor control driver 64b for adjusting the circumferential direction.

When the twist adjustment data e1 is included in a predetermined range, for example, in the state shown in FIG. 9, the twist adjustment pulse motor control driver 64c displays the adjustment data "0" on the left and right. The left and right adjustment data Zx is stored in the adjustment pulse motor control driver 64a (this corresponds to e2 in FIG. 9).
However, the circumferential direction adjustment data Zy (this corresponds to e3 in FIG. 9) is input to the circumferential direction adjustment pulse motor control driver 64b.

Then, based on these adjustment data, the pulse motor 14 of each adjusting means 14, 15, 16
a, 15a, 16a are activated, and each adjusting means 14, 1
The circumferential registration, the lateral registration, and the twist are adjusted by 5 and 16. The adjustment data “0” is data that does not require adjustment.

Next, the pulse T7 is output, the deflector driver 43 is activated, the deflector 42 (left and right deflector 42a) is activated by the deflector driver 43, and the laser beam is moved from left to right in FIG. The line is moved from the line CL2 to the line CL1 and one cycle of the register adjustment ends, but the register adjustment is appropriately repeated for a plurality of cycles until the end of the automatic register adjustment is notified.

In the above embodiments, the microprocessor (not shown) controls the operation circuit attached to the operation unit 67, the display unit, the timing generation circuit 65, the arithmetic units 63a to 63d, the holding units 66a to 66f, and the like. ing.

Plate cylinder 1 for front side printing of BB type printer 3
When the automatic register adjustment for 1 is completed, the operating section 67 is operated to operate the deflector 42 of the deflecting means 41 (the vertical deflector 42).
b) can be operated to perform the automatic register adjustment similar to the above for the plate cylinder 11 for back side printing.

Then, with respect to the other three BB type printers shown in FIG.
-The printing positions of the B-type printing press are now aligned with each other,
It is possible to perform beautiful color printing.

The present invention is not limited to the embodiments described above. For example, the two plate cylinders 11 of the B-B type printer 3 may be continuously automatically registered. In the embodiment shown in FIGS. 1 and 2, the mark detecting means 31
Is provided in the vicinity of the frame so that the automatic register adjustment can be performed even when the running paper 2 is running. However, if the automatic register adjustment is not performed when the running paper 2 is running, the mark detecting means 31 can be used. May be provided at an appropriate position.

Further, when the register marks 21 are arranged as shown in FIG. 14, one cycle of register adjustment is completed while the plate cylinder 11 rotates two times, and the second reference pulse BP2 in the above description is changed to The first reference pulse BP1 generated in the second rotation of the plate cylinder 11 is applied. When the register marks 21 are arranged as shown in FIG. 14, the twist adjustment data can be a deviation along the y-coordinate of the apex 211b ′ of the calculation position of the two register marks 21.

That is, it includes design modifications that do not depart from the scope of the claims.

[0062]

EFFECTS OF THE INVENTION As described above, by carrying out the present invention: 1. Mark detection for work, operation and maintenance at a position close to the plate cylinder, such as attachment / detachment of a plate and removal of dust on the plate. This can be performed without any trouble without removing or moving the means, which is effective in improving workability.

2. Since one mark detecting means can be shared by a plurality of plate cylinders, the manufacturing cost can be reduced. 3. Even if the register mark installation position changes, it can be handled without moving the mark detection means, which is effective in improving workability and non-skill, and can also maintain constant detection accuracy.

4. Even if the arrangement form of the register marks changes, it is possible to deal with it by a slight change in control, so to speak, any register mark arrangement form can be used. be able to.

It is possible to obtain great effects such as the above.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a detailed explanatory view of a plate cylinder portion and mark detection means.

FIG. 3 is a block diagram (1) of mark detecting means.

FIG. 4 is a block diagram (2) of mark detecting means.

FIG. 5 is a register adjustment control circuit diagram (1).

FIG. 6 is a register adjustment control circuit diagram (2).

FIG. 7 is a timing chart relating to the control circuits shown in FIGS. 5 and 6.

FIG. 8 is an explanatory diagram (1) of register adjustment.

FIG. 9 is an explanatory diagram (2) of register adjustment.

FIG. 10 is an embodiment (1) of a register mark.

FIG. 11 is an embodiment (2) of a register mark.

FIG. 12 is an embodiment (3) of a register mark.

FIG. 13 is a layout example (1) of register marks.

FIG. 14 is a layout example (2) of register marks.

FIG. 15 is a layout example (3) of register marks.

FIG. 16 is a diagram illustrating the position of register marks.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multicolor printing machine 2 Running paper 3 BB type printing machine 11 Plate cylinder 12 Blanket cylinder 13 Plate 14 Circumferential direction register adjusting means 15 Left-right register adjusting means 16 Twist adjusting means 21,211,212,21N, 21X Register mark 31 Mark detecting means 32 Laser beam output section 41 Deflection means 51 Rotary encoder 61 Control means 62 Synchronous pulse counting section 67 Operation section

Claims (2)

[Claims] 1. A plate cylinder (1) provided with means (14, 15, 16) for adjusting circumferential register, lateral register and twist.
In the multi-color printing machine having 1), a plurality of register marks (21) including all or a part including at least two sides excluding the bottom of the triangle are separated, and the respective bottoms are parallel to each other and the printing plate ( 1
3) Provided on the plate surface so as to be substantially parallel to the side edge, deflect the laser beam irradiation position to the register mark detection position on the plate surface (13), set the reference position on the plate cylinder, and rotate the plate cylinder. While irradiating the plate surface with a laser beam, the two sides except the bottom side are detected for each register mark (21) by the change of the reflection amount, and the bottom side with respect to the reference position is detected for each register mark (21). Exclude the calculated position of the intersection of the two sides, find the deviation in the circumferential direction or the left-right direction of the calculated position of the other intersection from the calculated position of the one intersection, and adjust the twist so that this deviation falls within a predetermined range. Means (16)
Adjust by the following, and determine the deviation in the circumferential direction and the left-right direction between the calculated position of at least one of the intersections and the standard position of the predetermined intersection, and make sure that these deviations fall within the specified tolerance range. An automatic register adjusting method characterized in that adjustment is carried out by a circumferential register adjusting means (14) and a lateral register adjusting means (15). 2. A plate cylinder (1) provided with means (14, 15, 16) for adjusting circumferential register, lateral register and twist.
In a multi-color printing machine having 1), it is made up of all or a part including at least two sides excluding the bottom side of a triangle, and the bottom sides are parallel to each other and substantially parallel to the side edges of the printing plate. A plurality of register marks (21) provided on the plate surface, a laser beam output section (32), and a deflection means (41) for deflecting the laser beam to a register mark detection position.
And a light receiving section (3) for capturing the reflected light of the laser beam.
A mark detecting means (31) provided with 7), a reference signal outputting means for outputting a reference signal at a predetermined rotation phase of the plate cylinder (11), and a plate cylinder (11) synchronized with the rotation of the plate cylinder (11). Synchronization signal output means for outputting a rotation synchronization signal for each predetermined angular displacement, and the rotation synchronization signal is counted based on the reference signal and the detection signal of the mark detection means (31), and the register adjustment is performed from the counting result. The amount is calculated, and each adjusting means (14, 15, 1
6) An automatic register adjusting device having a control means (61) for outputting an adjusting operation signal.