JPS60129261A - Method and apparatus for regulating register of printer - Google Patents

Abstract

PURPOSE:To simplify the mechanism of regulating register by a method in which two slant direction register marks and a horizontal direction register mark are formed on one side of each color plate and detected by a detector. CONSTITUTION:Error of register is adjusted by using register marks 2, 3, and 4 provided on one side of the plate 1, a reference position (X-X line), and a detection line (Y-Y line) by a light projecting and receiving device. Upper and lower registers are regulated by a distance FG and left and right-handed registers are regulated by a distance GH. Torsional register is regulated by a distance HI. The arrangement of the detector of register marks only on one side is sufficient enough.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a register adjustment method and apparatus for a sheet-fed printing press or a rotary printing press used for multicolor printing.

Generally, in multi-color printing, it is necessary to print each color at a predetermined position on the printing paper, and for this reason, trial printing is repeated from the image printed on the printing plate and the cross register mark (register mark) on the outer periphery. However, the register of each plate cylinder is manually adjusted. In order to automate this work, as shown in Japanese Patent Publication No. 55-25062 (1-1), horizontal and diagonal register marks are formed on the printing plate itself, and the positions of these register marks are detected. An adjustment device has been proposed in which the amount of misregistration is known.

RIJ, horizontal register marks are provided on both the operation side and the rapid movement side of the printing plate, and the amount of twist of the plate is detected from the phase difference between these two horizontal register marks. The amount of misregistration in the horizontal direction is detected from the distance between the horizontal register mark and the diagonal register mark, and the amount of misregistration error in the vertical direction is also detected from the distance between one of the horizontal register marks and the reference position. The plate cylinder is moved vertically and horizontally in response to signals.

However, in the above-mentioned adjustment device, register marks are formed on both the drive side and the operation side of the plate to detect the amount of twist, so a detection device for detecting the register marks on both sides is required. Two need to be provided for each plate cylinder, leading to an increase in the cost of the adjustment device, and there are disadvantages such as the adjustment of the mounting position of the detection device being time-consuming and troublesome.

The present invention improves the registration error toning problem in conventional multi-color printing. One horizontal register mark is formed in each machine, and these register marks are detected by one detection device to detect the amount of twist of the plate, the vertical registration error, and the horizontal registration error. It is an object of the present invention to provide a register adjustment method and device for multicolor printing, which can greatly simplify the mechanism of an adjustment device compared to the above.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the principle of the register adjustment method of the present invention will be explained based on FIGS. 1 to 6.

Figure 1 is a flat 1711 view of the printing plate 1. At the bottom of one of the driving side or the operation side (in this example, the driving side) of the printing plate 1 is a plate 1.7) parallel to the - side. A 1.C-shaped register mark is formed from the horizontal register mark 2 and the diagonal register mark 3 that intersects the horizontal register mark 2 at one end with a predetermined angle (for example, 45"), and A diagonal register mark 4 parallel to the diagonal register mark 3 is formed on (Eng.
-X-rays indicate reference positions, points A, 1S, C, D
, [, i indicates the end point of each register mark 2, 3.4, and the points ■・', G, II.

■ indicates Y-Y line and each register mark 2, 3.4 and X-
(r) at the intersection with the X-ray.

In order to adjust the registration error using each of the register marks 2, 3, and 4, the reference position (X-X line), and the detection line (Y-Y line), basically, the horizontal direction register is adjusted from the reference position. The vertical register is adjusted by the distance 9 to the mark 2, the horizontal register is adjusted by the distance GH on the detection line between the horizontal register mark 2 and the diagonal register mark 3, and the horizontal register mark 3 is adjusted.
The torsion register is adjusted using the distance 911-Jl on the detection line between 4 degrees. Here, the reference position value f3iJ is determined by attaching a reference signal generator to a part that rotates in the same direction as the plate cylinder, or by setting a reference printing unit and using the horizontal register mark detected from the plate surface of the unit as the reference position. May be set.

Next, a specific adjustment method will be described below.

First, as a first method, as shown in Fig. 2, when each register mark 2.3.4 is in the correct position, the end points of each register mark '2 + 3.4 are A and B.
, C, L) , +2, and the unregistered end point is A'
, B', C', 1 no/ , 1. ;/. Then, each point A'g'B'gC',l)',
Each of E' is one rotational movement of plate 1, vertical movement, and horizontal movement, and each corresponding point A, B, c
, D, and E.

Here, if the rotation angle of the plate 10 (rotation angle around the origin of the Kotsuking) is θ, the amount of movement in the horizontal direction is α, and the amount of movement in the vertical direction is β, then 1,6. , A,' to E/ are the coordinates of known points A to F and θ.

It can be expressed by three unknowns α and β.

Then, if we subtract the points G', iT', and 1' from the coordinates of the obtained points A' to E' and the detection line (X, -X), we get 1''G',G'l-1'. and shuttle 1' are expressed as functions of θ, α, and β as shown below.

That is, points A to J are A(al, bl), 13 (a2
11) 1), C (al, b2), D (a2.b3),
Iu (n 1 + b3 + b2 - b1), F (c
, d), then F Li' = (+) 1 sin θ−α c) ta
nθ+l), Cosθ1β−d −mG11′ =
(jan(θ-f')-tanθl (gsi++
θ(θ-It)-α+0)...(2) IJ'l'= (1sin(θ-j)-gsin(θ-
Month tan(θ-f)+Iccosθ・・・(3
) becomes.

Here, the coefficient C~ is as follows.

a1+82 - g=Jη]-脣一1 =V' a 2' + b22 2 -1 □□ ''-゛゛5T stone 1 ==b3-b1 On the other hand, k'G' , G'H' , H' 1 '
is detected by a sensor, etc., so by solving the equations (1) to (3) above using the constant and 1, the unknown number 0. α
, β are determined.

Therefore, if θ is multiplied by the hooking radius of rotation 11, the hooking i11·θ is obtained. These l□・θ, α,
β is the amount of twist, the amount of register error in the left and right directions, and the amount of registration error in the top and bottom, respectively, and the registration is adjusted by moving the plate according to the capacity.

Next, the second method will be described. While the first method detects the amount of error in the vertical, horizontal, and torsional directions by calculation from the state where the plate is out of register in the vertical, horizontal, and torsional directions, this method As shown in Figure 3 (
After adjusting the vertical and horizontal registers in advance, the amount of twist is calculated and corrected, and then the vertical and horizontal registers are corrected again.

That is, the plate before register error adjustment is moved by the vertical and horizontal register adjustment motors under known feedback control, and at point q, the horizontal register mark 2 is located at the correct position.
and the actual horizontal register mark 2" match, and the point H
In this step, the diagonal register mark 3 at the correct position is made to match the actual diagonal register mark 3'. Incidentally, the coordinates of the point A-I whose origin is the center of Kotsuking are known.

In this way, the end points of each register mark 2", 3", and 4" after the vertical and horizontal register adjustments are made at B.
“, (, D”, E”.

Here, the coordinates of point])7 are (x, y) and 1-, then point B''
Since the relative positions of C', I) and I are fixed, the point I is the intersection of D// B and the detection line (Y-Y line).
The coordinates of `` are expressed as a function of IY. Therefore, if we take the difference from H, 100P becomes a function of x and y, and the following equation is obtained.

Here, the coordinates of point A-P are A(a 1 l b□), 13
(a2sb,), (+1.b2 to -), D(a2.b3
), I! ”(C, d), and the coefficient is heat) 1+b.

m=- It is.

Also, all triangles standing on the same chord have the same apex angle.
, -, / Since H' and /B are apex angles of triangles that share the chord GH, LB"=LB. Therefore, x and y are expressed as the following circular equation.

(x-p)2+ (y-q)2=r2...
(5) Here, Ti t" is detected by the sensor, so it becomes a constant. Therefore, by solving the simultaneous equations of +4) and (5) above, x and y are determined, and point B# is determined. .

Then, if the coordinates of point B" are obtained, then point G.

Since the coordinates of B are known, the torsion angle θ(
/'13G13') is obtained.

Here, the torsion angle θ obtained by 5-82 C and above is multiplied by the radius of rotation of the twisting 11 to obtain the twisting amount l□·θ to be corrected.

In this way, when the tilting amount 1□·θ is corrected, errors occur in the vertical and horizontal registers, so the vertical and horizontal register errors are corrected again by feedback control, and the register adjustment is completed.

Next, a third method will be explained. According to the first method and the second method, although theoretically exact values can be determined, in practice they require complicated calculations, and furthermore, the torsion angle can be adjusted to a maximum of 0.02 within the adjustment range. Since it is extremely small after °Fiiii, high precision is required for calculation. On the other hand, the third method is simple and practical.

That is, as in the second method, first, the top, bottom, left and right registers of the plate are adjusted using known feedback control.Here, as shown in Fig. 4, the entire plate is twisted with the center O of the kotsuking as the origin. Assuming the case, the diameter of the Kotsuking amount is set to 11,
If the inclination of the plate is θ, the amount of tilting to be corrected is I,
It becomes xθ.

In reality, this is after the vertical and horizontal adjustments, so the plate is slightly shifted vertically and horizontally compared to the state where there is only a twist with respect to the center 0, but this value is minute and can be approximated as shown in Figure 4. Also good. On the other hand, the amount of movement BE// of the upper part of the diagonal register mark 4 is 1□×θ (1□ is the distance between the origin 0 and the lower end E of the diagonal register mark), as shown in FIG. ).

Here, since the torsion angle θ is generally minimal, 1)
If the angle between the horizontal register mark 2 and the diagonal register mark 3 is j and "3-," then the diagonal register mark 4゜4'' is almost parallel, so II'' is as follows. It is determined by the equation (7).

11''JFl 20LalIj song...(7) Also, the amount of twisting 1□·θ can be obtained from the equation (71, (8)) from FIG.

Here, if j is the most practical 45°, I2・θ−,
-II, so the equation (9) becomes.

The amount of kneading of the plate is corrected according to the amount 1□・0 obtained as above. In addition, the direction of Kotsuking is ■ and HI'
It is determined by comparing the size of ``T''.

Furthermore, if the amount of twisting is corrected, the vertical and horizontal registers will shift, so the vertical and horizontal registers are corrected in the same manner as in the Pj'' diagonal step 1.

Next, a fourth method will be explained. The third method measures a relatively long distance 1P between the diagonal register marks 3 and 4 at the bottom and top of the plate in order to set the plate P,
There is a possibility that a slight error caused by the lifting of the t-filled plate may have a large effect on the value of P.

Therefore, in the fourth method, as shown in Fig. 6, horizontal register marks 2 are placed on the top and bottom of the plate 1, similar to those on the bottom.
a, and rP is determined from the difference in distance between the horizontal register mark 2a and the diagonal register mark 4.

First, place the vertical/left/right register adjustment at the regular position of the register mark on one side/shape. In this way, the box edge can be ignored as it is around 0.0002 mm at most within the Kotsuking adjustment range, and 1 ■ “Hani I” and G11 (-KI)
What is expressed as the difference between 1. Cru.

After this, register adjustment is performed in the same manner as in the third method.

FIGS. 7 and 8 are schematic side and perspective views of a two-color sheet-fed printing press to which the register adjustment device according to the invention is applied; 12,
13, and a paper discharge device 14. printing equipment e12
Ink 1 stored in the ink tray 15
G passes through the ink roller group 17 and reaches the plate 1 attached to the plate cylinder 18.

Then, 1G of ink attached to the plate 1 is transferred to the rubber cylinder 19,
The first color is printed on the printing paper 21 flowing from the paper feeder 11 between the blanket cylinder 19 and the impression cylinder 2O.

Further, the printing paper 21 that has passed through the printing device 12 is transferred to the intermediate cylinder 2
2 and then the second color printing device;! Includes L la Hrc,
- Similar to the color, ink 2 is applied to the blanket cylinder 27 by the functions of the ink pan, ink 24, ink roller group 25, and plate cylinder 26.
4 is transferred, and the second color is printed on the printing paper 21 by the blanket cylinder n and the impression cylinder 28.

The printed paper 21 printed in this manner is sent to the paper discharge device 14 via the paper discharge cylinder 29, and printing is completed.

On the other hand, on the plate 1 attached to the plate cylinder 18, as shown in FIG. is parallel to. A light projector 30 and a light receiver 31 are provided near the driving side of the printing cylinder 18, at a position where each register mark 2, 3.degree. 4 can be detected.

Further, a proximity switch disc 32 is directly connected to the plate cylinder 18, and a proximity switch 33 is fixed at a position facing the proximity switch disc 32. Furthermore, a pulse signal oscillator 35 is directly connected to the shaft 34 of the impression cylinder 2o, a plate cylinder drive device 37 is attached to the shaft 36 of the plate cylinder 18, and register adjustment motors 38, 39, 41) are connected to this plate cylinder drive device 37. These motors 38, 39, and 40VC individually adjust the torsion, vertical, and left/right registers. Similarly, the printing device 13 is also provided with a proximity switch 41 and a proximity switch disc C. In addition, the proximity switches 33, 41. The proximity switch discs 32 and 42 may be mounted at any location as long as the phase is the same as 100 revolutions of the sheet-fed printing press.

Next, the operation of the register adjustment device in a sheet-fed printing press will be explained based on the control system block diagram of FIG. 9 and the waveform diagram of FIG. 10. It is assumed that the register adjustment device performs the third method described in 1.

First, the plate surface detection signal a from the emitter 30 and the receiver 31
is gated by a mark detection circuit 43 using a signal from a timing generator 44, and only the mark signal is waveform-shaped and taken out as a pulse signal. .

The phase difference of this pulse signal is compared with the base f143 in the phase difference discrimination circuit 45, and the phase difference between the reference signal and the horizontal register mark No. 13C is determined, and the phase difference between the horizontal register mark and the first diagonal register mark is determined. signal d and the first
And a second diagonal register mark phase difference signal e is extracted.

The horizontal register mark counter 46, the first diagonal register mark counter 47, and the second diagonal force tank 48 use each phase difference signal as a gate to count the number of pulses from the inter-signal pulse signal oscillator. .

The output from the counter 46 is input to a comparator 49, where it is compared with a vertical orientation reference value 50, and the vertical register mark 2 is placed at a predetermined position. The motor 38 is driven via the drive circuit 51.The output of the counter 47 is also input to the comparator 52, where it is compared with the left and right register reference value 53, and the output is adjusted so that it matches the register reference value, that is, at a predetermined position. The motor 39 is driven via the left and right motor drive circuit 54 so that the diagonal register mark 3 is aligned.When the reference value and the counter value match, the calculator 55 calculates the twist amount from the three types of counter values. , drives the spooling motor 40 via the spooling motor drive circuit 56.

Also, since the vertical and left-right registers are slightly shifted due to the correction of the amount of twist, the horizontal register mark 2 and the diagonal register mark 3 are detected again and the vertical and horizontal registers are adjusted in the same manner as described above.
Perform left and right register - 4" 1 alignment.

Note that in the printing device 13 as well, the emitter 3O1 and the receiver 31
The plate surface detection signal a' from is processed by the mark detection circuit 57,
Gated by a signal from a timing light generator 44, and via a control circuit 58 similar to that described above, IW, vertical, and left/right register errors are adjusted.

As explained above (according to the present promotion), whereas in the past, register marks were formed on both the driving side and the operating side of the plate, the register marks were formed only on one side. It is sufficient to install the registration mark detection device only on one side. Therefore, the number of detection devices is halved, and the mutual position adjustment of the detection needles and the overall matching are greatly reduced, and the registration adjustment device The device itself can be simplified, the mounting space can be small, and the cost is also advantageous.

Note that the mark formed on the printing plate may be in the above-mentioned / shape, it may be in the shape where the horizontal line and the diagonal line end do not match, or it may be a Δ-shaped mark. .

[Brief explanation of the drawing]

Fig. 1 is a plan view of the plate, Fig. 2 is a plan view of a part of the plate showing the first register adjustment method, Fig. 3 is a plan view of a part of the plate showing the second register adjustment method, Fig. 4 is a plan view of a plate showing the third register adjustment method, Fig. 5 is a partially enlarged view of Fig. 4, and Fig. 6 is a plan view of a part of the plate showing the fourth register adjustment method. 7 is a schematic side view of the sheet-fed printing press, FIG. 8 is a perspective view of the sheet-fed printing press, FIG. 9 is a control system block diagram, and FIG. 10 is a waveform diagram. 1... Version, 2, 2a... Horizontal register mark, 3.4... Diagonal register mark, 10...
Sheet-fed printing press, 12, 13...printing device, 18, 2
6... plate cylinder, 30... emitter, 31... light receiver,
32, 42... disc for proximity switch, 33, 41
... Proximity switch, 30, 3ri, 40... Register adjustment motor. Applicant's agent Kiyoki Inomata Figure 2 Figure 3 Figure 4 Y

Claims (1)

[Claims] 1. A register mark consisting of a first horizontal register mark and a first diagonal register mark extending diagonally with respect to the first horizontal register mark on one side of the printing plate, and a register mark separated from the register mark along the detection line. the first of said register marks, which is at least the second diagonal register mark of a second horizontal register mark and a second diagonal register mark;
a distance between a reference position on the detection line and the first horizontal register mark, and a distance between the first horizontal register mark and the first diagonal register mark on the detection line; The position of the second diagonal register mark on the detection line is detected, and the amount of deviation and twist in the vertical and horizontal directions is determined from these three detection elements, and the vertical, horizontal, A register adjustment method for a printing press, characterized by adjusting twist register. 2. The distance between the reference position on the detection line and the first horizontal register mark, the distance between the first horizontal register mark and the first diagonal register mark on the detection line, and the distance between the second diagonal register mark. The position is detected, the distance between both diagonal direction registers is calculated, and each register IAI amount is calculated based on an equation showing the relationship between these three distances and the amount of deviation and twist in the vertical and horizontal directions. A register adjustment method for a printing press according to claim 1, characterized in that: 3. Detecting the distance between the reference position on the detection line and the 3gt horizontal register mark to adjust the vertical deviation, and also detecting the distance between the first horizontal register mark and the first diagonal register mark on the detection line. The printing plate is positioned at the correct position in the vertical and horizontal directions by adjusting the deviation in the horizontal direction.Then, the distance between both diagonal register marks on the detection line is detected, and this distance and the Claim 1 is characterized in that an equation showing the relationship between the coordinate positions of the intersection points of the star marks is established, and the torsion angle from the register mark at the reference position is determined based on this equation. How to adjust the register of a printing press. 4. Detecting the distance between the reference position on the detection line and the first horizontal register mark to adjust the vertical deviation, and also adjusting the distance between the first horizontal register mark and the first diagonal register mark on the detection line. By detecting and adjusting the deviation in the horizontal direction, the printing plate is positioned at the normal position in the vertical and horizontal directions, and by detecting the position of the second diagonal register mark, the printing plate is positioned on the detection line from the normal position. Find the deviation in , and this deviation,
The distance between the hooking center and the upper end of the second diagonal register mark, the hooking radius, the helix angle, and the second diagonal register mark.
4. The method of register adjustment for a printing press according to claim 1, wherein the amount of twisting is calculated from an equation that subtracts the relationship between the inclination angle of the diagonal register mark and the horizontal direction. 5. Form two/shaped registration marks spaced apart from each other along the detection line, and detect the distance between the reference position on the detection line and the first horizontal register mark on one of the registration marks to determine the vertical position. By adjusting the deviation in the horizontal direction and adjusting the deviation in the left and right directions by detecting the distance between the first horizontal register mark and the first diagonal register mark on the detection line, Position the printing plate, detect the distance between the second horizontal register mark and the second diagonal register mark on the detection line of the other register mark, and measure the deviation on the detection line from the normal position. From an equation showing the relationship among the deviation, the distance between the center of the cot-king and the top of the second register mark in the first direction, the radius of the cot-king, the torsion angle, and the angle of inclination of the second diagonal register mark with respect to the horizontal direction. 2. A method for register adjustment of a printing press according to claim 1, characterized in that the amount of twisting is increased. 6. A plurality of register marks provided on only one side of the printing plate are arranged adjacent to only one side of the plate cylinder in order to detect them along their detection lines, and each register mark is detected along the detection line. A detection device that emits an Iho signal, a phase difference discrimination circuit that detects the phase difference between each signal emitted from this detection device, a pulse oscillator that generates a pulse in synchronization with the rotation of the printing press, and a phase difference indicated by -Mil. an arithmetic unit that calculates errors in vertical, horizontal, and torsional registers from the indication j signal and a pulse signal from a pulse oscillator; and a control that moves the plate cylinder in the vertical, horizontal directions and tilts it according to the amount of the registration error. A register adjustment device for a multicolor printing press, characterized in that it consists of a device.