JPS5929165A - Apparatus for automatically adjusting register of multicolor printing machine - Google Patents

Abstract

PURPOSE:To provide the titled apparatus for stably performing the adjustment of register with high accuracy and for carrying out the detection of distortion to display the situation of distortion, constituted from such a mechanism that an automatic gain function is imparted to an input part and an integration part is provided between a detecting part and an output part. CONSTITUTION:The change in the quantity of reflected light corresponding to the rotation of a first and a second register marks 22, 23 is sent to an input part through the light receiving element 32 of a light emitting and receiving sensor and an amplifier 34. Detection output is passed through a variable gain amplification circuit and a diferentiation circuit to extract only the output with necessary timing by gate pulses e1-e3 and front edge and rear edge pulse signals based on the register mark 2 from which a noise component or the like is removed and a pulse signal (g) based on the register mark 23 are indivisually imparted to time difference detecting parts TED1, TED2 for adjusting register and time difference detecting part TED3 for detecting distortion. Signals i1-i3 corresponding to the time difference with reference timing pulses h1-h3 from a reference signal generating part FSG are indivisually imparted to integration circuits INT1-INT3.

Description

DETAILED DESCRIPTION OF THE INVENTION Invention V1, in a multicolor printing press, detects the registration error between each color before printing starts, automatically corrects the registration error, and detects and displays the twist of the printing plate. This invention relates to a register self-tapping 1 adjustment device.

In multicolor printing machines, it is necessary to perform registration adjustment so that the printing on the paper by each color printing plate perfectly matches. Conventionally, registration marks called register marks are printed for each color and then the registration marks are adjusted. The situation of "misalignment" is judged by RI, or the situation of the pattern printed for each color is judged visually, and the registration is adjusted while performing trial printing of the corresponding stone. However, this method requires a large amount of paper for trial printing, takes a long time to adjust the register, and requires skill.

Recently, as a countermeasure for this drawback, [register adjustment device 1]
('F1? Publication 55-25062), a F-shaped register mark was provided on the surface of each color printing plate, this was detected photoelectrically, the relative relationship was determined by the rotation of each color printing plate, and the register mark was registered before printing started. Although a means of adjustment has been devised, the printing press has its own irregular rotating wet material IViJ1.
．． l, - and ' due to electrical noise and other external factors,
- Requires registering accuracy, accuracy and high stability 17. However, it still has drawbacks that are not sufficient for practical use.

On the other hand, (even if the alignment is perfectly adjusted, the printing plate may be twisted when it is attached to the plate cylinder, and this twisting is accurately detected and displayed7, and the twisting situation is corrected. There is a growing demand for convenience.

The purpose of the present invention is to fundamentally solve the drawbacks and desires of the conventional technology; 1, ii 3: 1L, Bukoj sword and -z: 4i
``□Using the triangular first register mark, its rotation status is detected by a reflective throw/receiver)''; Based on the reference pulse obtained from the rotary encoder which rotates at the same time and the rotating pulse with a shorter period than this, the leading edge pulse signal and the trailing edge pulse signal After obtaining the time difference signal and the trailing edge time difference signal, according to the output after integrating these,
By adjusting the ik direction and the left/right direction for each plate cylinder, register adjustment can be performed stably and with high precision, and the register mark can be placed on the same vertical axis as the first register mark and at a location separated in the vertical direction. A second resistor having sides that are inclined at least from the vertical direction to the horizontal direction is provided, and the detection output of the light emitting/receiving sensor obtained by this is processed in substantially the same manner as described above to detect twisting. The present invention provides an extremely effective register adjustment seat for a multi-color printing press which is designed to display the twist status.

Hereinafter, the present invention will be explained in detail with reference to figures showing embodiments.

Is Figure 1 an outline of a multicolor printing press? ? The paper 2 fed from the paper feed section 1 is deposited between the blanket cylinders 3a to 3d provided for each color and between the blanket cylinders 3a and 4g of the impression cylinders 4a to 4d. Each goth is inserted through the transfer cylinders 5a to 5e. Torso 3)) ~ 3d) - River 11ti64 a ~ 4
d, and is finally discharged by 111 paper cylinder 6re, and plate cylinders 78 to 7d equipped with printing plates for each color are in pressure contact with each blanket cylinder 38 to 3d. and each plate cylinder 7
By the ink roller group 8 provided every 7d from a to 7d,
The ink is supplied to each printing plate from a to 7d from the rubber cylinder 38 to
3(1-\transferred, and it is further transferred to the paper -(
Multicolor printing is performed.

However, the motor Mt that adjusts the phase of each plate cylinder 1a to 7 (in 1, ξ angle C) in the vertical direction, that is, in the direction of 9 rotations.
F+, -Mld and 2- are provided with a motor M2a'□ M2d for adjusting the position in the left and right direction, that is, in the axial direction.・17tL~7d, 'One opposing reflection type throw and receive>Y, -Hinzo 9p.

-, 9d) are installed on each plate cylinder 7. Same as a-7d 111LC rotating wheel nQ=' Lllil 5 c
K' Ityo-ta IJ x :y-7-RE are connected.

Figure 2 L is a diagram showing the relationship between the plate cylinder 7 and the light emitting/receiving sensor 9, in which a triangular first register mark 22 is placed around the margin of the printing plate 21 attached to the plate cylinder 7. A binding-C is formed with register margins 22i, J, sides 22a in five directions (left and right), and sides 22b inclined from the top and bottom directions to the left and right directions, and the opposite side I7 is used to transmit and receive light. The sensor 9 is fixed to the frame of the printing press or the like so that it can be adjusted freely.
I'm at t.

In addition, a second register mark 23, which is triangular in this example, is also provided at a location on the same vertical axis as the register mark 22 and separated in the direction of the top and bottom.
It is formed to have sides 23a that are inclined from the vertical direction to the horizontal direction.

FIG. 3 is a diagram showing details of the register marks 22 and 23 and the throw/receive sensor 9, and shows the register marks 22 and 23 rotating in the direction of the arrow as the plate cylinder T rotates. The light beam from the center is projected as a spot, and the change in the reflected light in response to the register rotations of 22 and 230 is shown. : After being converted into an electric signal by a light receiving element 33 such as an il or a tube, it goes up to an amplifier 34 and is sent out as a detection output.

Figure 4 shows the situation in which the printing plate 21 is twisted and installed, and the Anl1 plate 21 is twisted and installed. 23 is the normal digit j? shown by the dotted line? The time point at which the signal corresponding to side 23a obtained from the detection U+ force of light emitting/receiving sensor 'v9 is generated changes, and 10 times, and the detection of the torsion is carried out accordingly.

However, if a deviation occurs in the vertical orientation of the printing plate 21, the time point at which No. 4 is generated from the light emitting/receiving sensor 9 corresponding to the register mark 22σ and J22a will be different, while the horizontal orientation ((( If a 14 difference is generated, it corresponds to the side 22b of the register area 22] 9 receiver)'t The signal generation time of the IW inner 9 is different, and there are 2L-C vertical directions, and horizontal and vertical directions. The misregistration bias) -9 is t, jb 11 -L) c is.

Figure 5 Q, 1. The block diagram does not show all the groove bottoms.
The input section IND in FIG. 5 is detailed in FIG. 6, and the reference signal The details of the generation part FSG are shown in Fig. 7, and the time difference detection part TFI) 1~
Details of TF; D3 are shown in Figure 8, integral part INT+ ~ IN
The details of T3 are as shown in Figure 1O.

In addition, the waveforms of each part in FIGS. 5 to 8 are as follows.
As shown in the timing chart in the figure,
The rotary encoder RE generates a reference pulse (a) once per rotation, and also generates a rotation pulse (b) in synchronization with this and with a shorter period. In this example, the rotation pulse ( b) is generated 1000 times per revolution.

Detection output from Z sensor 9 (c)
is amplified by a pulse amplifier PA consisting of a variable gain amplifier circuit vGA and a differentiation circuit DF as shown in FIG.
After the leading edge and the trailing edge of the detection output are differentiated and become a differential pulse (d), a gate circuit GC is turned on in response to gate pulses (el) to (ρ3) from the reference signal generator FSG. The pulse is extracted as an extracted pulse (f), and is subjected to waveform shaping and detection by a waveform shaper WF, and is then processed into a leading edge pulse signal and a trailing edge pulse signal based on the register mark 22, and a register mark 23. However, the peak value of the extracted pulse (f) is given to the variable gain amplifier circuit VGA via the gain control circuit GCT, and the extraction pulse (f) is The gain of the variable gain amplifier circuit VGA is controlled in the direction that the peak value of the pulse (f) is constant. For the sharp leading edge of the output (c) and the trailing edge of the shape 1, [, the component pulse ((1) is obtained with accurate timing. Irrespective of the differential pulse (d), its own weight, 11 gain!till
'dll results in extracted pulses (f) having the same peak value.

On the other hand, the reference signal generator F'SG←l1.11) 7 As shown in Figure t]-p re-engoder RF: to (7) base (reset by I pulse (a)) +Z, L to count CT.
Rika 1 and II Bepulse (b) for Karan and this 711
Decoding the count output of
Drive the signal generation circuit I'G+, F'<:2, and use the reference pulse (n) as the reference time to generate the gate Z pulse (el) ~ (
C3) Trigram and reference timing pulse (h+) - C1
13), in this example, the reference pulse (a)
From n Roo? and n-t n1th and n + m
In response to the -t-pth rotation pulse (b), the timing pulses (111'), f, I12') and (h3) are generated, and 1/C1, 11-1! 1st and n (-・11~male・piece and n 4-1'
TI l-p-' In response to the first rotational pulse (b), the gate pulse (I・1) and (ρsi:) and (m'
() is occurring.

By using the gate pulse ((・I') -403), only the required timing is extracted 11, and the leading edge and trailing edge pulse signals and register marks are extracted based on the register marks 22 from which noise components and the like have been removed. The pulse signal (g) based on 23 is sent to the time difference detection unit TF for register adjustment.
:DI, TED2 and the time difference detection unit 1'F, D:+'' for twist detection, and the reference timing pulse (hl) to (tt) from the reference signal generation unit FSG is given to each
3) The leading edge and trailing time difference signals (11) and (12) of the pulse width corresponding to the tonnage time difference and the time difference signal (i
3) and is applied to each of the integral concave paths lNTl to INT3.

Nao, time difference detection unit TEI) 1 to TED 3 is the 8th
As shown in FIG. 1, the time difference detection unit TEI)+ is a pulse generator PG3 using a monostable multivibrator or the like that generates pulses of the same time width according to human power.
It is composed of PG4 and inhibit gates Gl1G2, and operates as shown in FIG. 9, which shows the waveforms of each part in FIG.

That is, in FIGS. 8 and 9, the time difference between the leading edge pulse signal and the reference timing pulse (2) in the leading edge and trailing edge pulse signals (1) based on the register mark 22 is detected. Pulses (4) to (1) are generated in response to the edge pulse signal and the reference timing pulse (2), pulses (4) and (7) and the gate pulse (
3) is given to the input of inhibit game) Gl,...
Since pulses (5) and (6) and gate pulse (3) are given to the input of inhibit gate G2, the output (8) of inhibit gate G1 is the leading edge of reference pulse (2). The time difference when the pulse signal (1) occurs late is extracted, and the output of the inhibit gate G2 is the leading edge pulse signal (1) with respect to the reference pulse (2).
) occurs and the time difference is extracted, and the output (8) is sent out as a time difference signal 11・),
The output (9) is sent out as a time difference signal i, -s.

In addition, in the time difference detection unit TED7, since (h2) is given as the reference timing pulse (1) and (C2) is given as the gate pulse (3), the trailing edge pulse signal based on the register margin 22 and The time difference is extracted, and in the time difference detection unit TED:<, (h-'I) is given as the reference timing pulse (1) and (C3) is given as the gate pulse (3), so the register mark The time difference between the pulse signal and the pulse signal based on the trailing edge of the printing plate 7 is extracted.
1) to (13) are respectively applied to the differential type integral unit lNTl -INT:+ shown in FIG. Furthermore, the voltage is applied to the capacitor C11C27\, and is subjected to the integral action by these, and is smoothed by the action of the integrator from the operational amplifier OP, the capacitor C], and the resistor R3.
], leading edge and trailing edge time difference signals (1), (i2) and outputs corresponding to the time difference signals (13).

However, d1 resistor R4+ is connected between both inputs of operational amplifier op.
R5+R6 Oh, the bias voltage from the power supply ■Cc is applied by the bias potentiometer RV, and the output can be forced to zero according to the adjustment of the body circle meter ■ζ■, and the detection output ( It is possible to finely set the relative relationship between the leading edge and the trailing edge of c) with each of the time difference signals (1]) to (13).

A time difference detection section TEr)+ for register adjustment, an integration section INT+ corresponding to TED2, and TNT? , each output of
A 3-phase AC power supply 3φ AC is input J to II, and the voltage is intermittent according to the pressure, and the motor M+ is connected as a body according to the input polarity.
M? In order to send output parts 0Tr)+ and 0TI)2 to each output part 071'+month,
Motors M1 and M2 rotate according to the voltage and polarity from O'l'D2, and vertical phase adjustment and horizontal position adjustment with respect to the plate cylinder T are performed.

That is, as is clear from FIGS. 2, 3, and 11, the leading edge of the detection output (e) from the register mark 22 changes in time depending on the rotational phase of the plate cylinder I, and accordingly, As the generation point of the preceding pulse signal (g) changes, and accordingly the pulse width of the -C leading edge time difference signal (11) changes, the output voltage of the integrating section INT+ also changes, and this change is By controlling the motor M1 in the direction in which the direction decreases by 1, the vertical orientation -Hp4
9 is automatically performed, and -C equilibrium is achieved at the DI signal where the leading edge time difference signal (quantity 1) is no longer generated.

Further, the register adjustment in the left and right direction is similarly performed based on the trailing edge of the detection output (e) from the register register 22, and equilibrium is reached when the trailing edge time difference signal (12) is generated and 2 disappears.

However, as mentioned above, the potentiometer 1t in Figure 10
By adjusting V, it is also possible to artificially set the optimum state.

Note that the output units OTD+ and OTD2 may be configured by a comparator, a pulse generation circuit, a thyristor, a relay, or the like.

On the other hand, the output of the integrating section INT3 corresponding to the time difference detecting section TED3 for detecting twisting is converted from an analog to digital converter (
Hereinafter, AI) C) is applied to the A/D, where it is converted into a digital signal, stored in the memory MM, and the contents of this are sequentially read out, and then output to the output section OTD.
3 to the printer PT as a display section,
The twist detection needle is printed out and displayed on the operating panel.

However, it is necessary to display the twist after the register adjustment is completely completed, and the display of the twist must be performed in the integral part lNT1. When the output of INT2 becomes zero, the output of output section OTD:'l is sent out.

Note that the output section OTD 3 is composed of a decoder, a drive circuit, a gate circuit, and the like.

1. Therefore, registration adjustment in the vertical and horizontal directions is automatically performed, and the twist that occurs when the printing plate 21 is attached to the plate cylinder 7 is accurately displayed, making it extremely easy to correct the twist. .

However, the register mark 22 may be formed with sides 22a in the left and right direction and an inclined side 22b, and the register mark 23 may also be formed with an inclined side 23g. The same effect can be obtained even if a character display device or the like is used instead of PT, and the memory MM and 1. If analog memory is used, ADC-A/D can be connected to memory MM.
The present invention can be modified in various ways, such as being able to be inserted into the output side of the system, and the configuration of each part can be selected arbitrarily as long as it has the same function.

As is clear from the above explanation, according to the present invention, since the input section has an automatic gain function, each Noculus signal can be obtained accurately according to the leading edge and trailing edge of the detection output, and dirt on the register mark can be avoided. For [7], the detection status is reliable, and by inserting an integral part between the detection part and the output part, printing can start with high precision and stable register adjustment despite the unique rotational characteristics of the printing machine. Since the twist of the printing plate mounting condition is accurately displayed, BTU exhibits a remarkable effect in multicolor printing presses for various uses.

[Brief explanation of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a multicolor printing press, FIG. 2 is a diagram showing the relationship between the plate 11 (4) and the light emitting/receiving sensor, and FIG. 3 is a register mark Fig. 4 shows the situation where the printing plate is twisted and attached. Fig. 1 is a developed view. Fig. 5 is a block diagram of the entire configuration. Fig. 6
Figure 7 is a block diagram of the input section, Figure 7 is a block diagram of the reference signal generator, Figure 8 is a block diagram of the time difference detection unit, Figure 9 is a timing chart showing the waveforms of each part in Figures 1 to 8. , Fig. 10 is the circuit diagram of the integrating section, Fig. 11 is the circuit diagram of the fifth section.
9 is a timing chart showing waveforms of various parts in FIGS. 8 to 9. FIG. 7 e 7h-7d m 豐* *Print cylinder, 9, 9a~
9d @ Fist... Light emitting/receiving sensor, 21... Printing plate,
22.23-... Toshi register mark, 22a, 22
b, 23a @--side, RE @ ・ψ-rotary encoder, IND...input section, TFD+-TE
D3...Time difference inspection section, IN'lJ= INT:l
e m bottle*integral part, OTD 1~OTD 3* *
e @ It force part, M+, M+a ~Mxd t
M2, M2a ~ M2d...Motor, (:cT・
... Benefits 1) Control circuit, OP... Linear amplifier, P
T...Printer. 1i4Fi person for patent Komori Printing Yangwa L Co., Ltd. Agent Masaki Yamakawa (1 person) Figure 6 FSG 1! R7 Figure C Figure 8

Claims (1)

[Claims] A first register mark provided on each printing plate surface mounted on each plate cylinder of a multicolor printing machine and having sides in the left-right direction and sides inclined from the vertical direction toward the left-right direction, and the first register a second register mark provided on the same axis in the vertical direction as the mark and at a part separated in the vertical direction and having at least a side inclined from the vertical direction to the left-right direction; and rotating in the vertical direction together with each of the plate cylinders. a reflective light emitting/receiving sensor provided on each plate cylinder opposite to each register mark for detecting the first and second register marks; a rotary encoder that generates a rotational pulse with a shorter period than the reference pulse, and a detection output of the light emitting/receiving sensor that is set to a constant peak value by automatic gain control and then differentiated, and the first register mark is set with the reference pulse as a reference time point. A differential pulse corresponding to a leading edge and a trailing edge of the detection output based on the leading edge and a trailing edge are set as leading edge pulse signals and a trailing edge pulse signal corresponding to the leading edge and the trailing edge, and the detection output is based on the second register mark. A crotch input section corresponding to the light emitting/receiving sensor that extracts a differential pulse corresponding to the trailing edge and generates a pulse signal corresponding to the trailing edge; a time difference detection unit for register adjustment that generates a leading edge time difference signal and a trailing edge time difference 1i5 according to the time difference between a time difference detection section, an integration section provided for each of the time difference detection sections that integrates the output of each of the time difference detection sections, and the leading edge of the integration section corresponding to the time difference detection section for register adjustment. The time difference for register adjustment that adjusts the vertical phase of each plate cylinder according to the output corresponding to the time difference signal, and adjusts the horizontal position of each plate cylinder according to the output corresponding to the trailing edge time difference signal. an output section provided for each integrating section corresponding to the detecting section; an output section that sends out a display signal according to the output of the integrating section corresponding to the time difference detecting section for twist detection; and an output section driven by the output section. A register adjustment device for a multicolor printing press with the first display section and the first display section as the first indicator.