JPS6239242A - Gate pulse generation circuit for extraction of detecting signal - Google Patents

Abstract

PURPOSE:To perform detection of an estimated error of a rotary press machine precisely by surely extracting a detecting signal of a register mark, by generating a gate pulse which is in a pulse width containing a detecting signal of the register mark according to a result which has detected the lapse of time corresponding to an interval up to a shorter one than a regular interval between a reference mark and the register mark from the forward edge of the reference mark on the basis of detecting signal of the reference mark. CONSTITUTION:As each of marks is so constituted as to be detected as an electric signal by a photoelectric detector 5 fixed on a scanning line 4 by opposing to each of the marks and detection is performed on the scanning line 4, a pulselike signal is obtained according to transfer of long-sized paper 1. Therefore, when a clock pulse C having sufficiently higher high frequency than teach of pulse widths and pulse intervals corresponding to each of lengths and intervals d0, l, D is counted from the forward edge 2a of a reference mark 2 on the basis of a detecting signal B and counted up to a count value n1 whose interval l is shorter than an interval L in addition to a count value n corresponding to the do, time is reached to a point of time t1 and when the gate pulse D is generated up to a count value n2 from that point, a pulse width of the same comes to contain the detecting signal of a register marks 3a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention extracts the detection signal of a register mark printed on a long sheet of paper with a roll stop of m in order to detect all the vertical registration errors that occur in a rotary printing press. This invention relates to a gate pulse generation circuit that turns on this extraction gate circuit. .

[Conventional technology]

In a rotary printing press with multiple plate cylinders, printing is performed sequentially (by the plate of each plate cylinder) onto a long sheet of paper such as roll paper. This is for the purpose of automatically correcting the registration error corresponding to the printing position of each plate, and controlling the image 4i of each plate in a direction in which the images 4i match.

Japanese Patent Application Laid-Open No. 14751/1983 by a separate client of the present applicant.

Japanese Patent Laid-Open No. 58-14752 and other publications disclose various automatic register adjustment devices.

Register marks are printed on each plate of long paper to detect registration errors, and when extracting the detection signal of each register mark, this occurs in synchronization with the rotation of the printing press.

It uses a gate pulse with .

[Problem that the invention seeks to solve]

However, in the past, in addition to driving a single-yarn multivibrator etc. in response to pulses from a pulse ordering means connected to the rotating shaft of the printing press, the timing of the gate pulses generated thereby was artificially adjusted. In addition, the long paper expands and contracts in response to changes in various printing conditions and transport conditions of the long paper, and the distance between the printing area and the register mark detection area increases by several roms. Therefore, the influence of long paper expansion and contraction is large, and the optimal timing of the gate pulse changes accordingly, whereas the timing of the gate pulse is fixed after setting, and register mark detection signal extraction 3 [Problem "fr-Means for Solving]" In order to solve the above-mentioned problem, the "non-explosion" is constructed by the following means.

That is, when a gate circuit extracts a detection signal of a register mark printed on a long sheet of paper following a reference mark at regular intervals, a circuit that generates a gate pulse to turn on this gate circuit receives 57! I! ir! means for detecting the passage of time from the front edge of the reference mark to a specified interval between the reference mark and the register mark based on the detection signal of the A mark; 3. [Function] Therefore, by means of printing reference marks and registers at specified intervals and detecting the passage of one hour, If the time elapsed from the front line of the reference mark to an interval shorter than the specified interval is detected, this point will be slightly earlier than the detection signal of the register mark, and the gate pulse will be generated based on this point. [Embodiment] The present invention will be described in detail below with reference to figures showing embodiments. 1 The second figure shows the printing status of the valley mark, the same figure (B) shows the waveform of the detection signal, the same figure (C) shows the clock pulse count situation, and the same figure (6) 2 is a diagram illustrating the generation situation of gate pulses, and in (A), a fixed length do is applied to the side of a long paper 1 such as a roll paper in the feeding direction indicated by an arrow, and the first version is set as a standard. At the same time as printing mark 2, following this, a specified interval Li is provided, and
The first register mark 3a on the first plate and the same mark 3b on the second plate are printed at predetermined intervals. In this example, the reference mark 2 and the register mark 3a are both the same color, and the register mark 3b is the same color. 1゜These marks printed in other colors are detected as electrical signals by a photoelectric detector 5 such as a reflected light type or transmitted light type fixed on the scanning line 4 facing each mark. Become the one who will be treated,
Since the detection is carried out on the scanning line 4, in (B) a signal in the form of a pulse is obtained according to the transport of the long paper 1. Therefore, each pulse corresponding to each length and interval do, t, D Clock pulses (C) having a sufficiently high frequency than the width and pulse interval are counted from the front edge 2a of the reference mark 2 based on the detection signal (), and d.

and the corresponding count value n plus an interval t shorter than one interval
Counting up to the count value n1 is 1+ at one point in time.
is reached, and from now on the gate pulse (2) is set to the count value n2
When the pulse width reaches register mark 3a,
However, if a similar gate pulse (D) is generated after the count value n3, this time it will include the detection signal of the register mark 3b.

Therefore, the gate pulse (D) can reliably extract the detection signal (B) of the register marks 3a and 3b.

On the other hand, the expansion/contraction rate t-1 of the long paper 1 (, each register mark 3
The amount of misalignment between each board on which a and 3b are printed is Δ
d, the length of the reference mark 2 do, the time width of the pulse corresponding to T, the time between each pulse corresponding to each register mark 3a, 3b, t, and if the transport speed of the long length R1 is constant, the actual , k is included in the actual length doy of the reference mark 2, and the register mark 3a.

Since the actual distance Dr of 3b includes k and Δd, the following equation holds true.

If Δd is calculated from equation (1), the following equation is obtained.

Therefore, for each time the ratio of T and t and the known length do
Furthermore, the amount of misregistration Δd can be detected by calculating the equation (2) based on the distance DK.

When determining the time ratio, the expansion/contraction rate k is removed by erasure as shown in equation (1), and an accurate Δd that eliminates the influence of this is obtained.

FIG. 3 is a block diagram of an electric circuit for automatic registration adjustment based on the above principle, and the electric signal from the above-mentioned detector 5 is
It is shaped into a pulse signal by the waveform shaping circuit 21,
In the extraction circuit 22 described later, the count value n shown in FIG. 2 is obtained, and only the pulse signals corresponding to the register marks 3m and 3b are extracted, and a control circuit 23 such as a clip-flop circuit is activated in response to this pulse signal. and a stop signal are sent out alternately.

Further, the output of the clock pulse generation circuit 24, which generates clock pulses with a sufficiently high frequency compared to the times T and t in synchronization with the rotation of the printing press, is transmitted to the extraction circuit 22 and the counter 2.
5, the counter 25 starts counting clock pulses in response to a start signal from the control circuit 23, and clears them in response to a similar stop signal. is determined as the clock pulse count value.

This is sequentially held by the latch circuit 26 and is given to the arithmetic unit 27 consisting of a microprocessor, memory, etc. together with the count value n of the extraction circuit 220, where the calculation of equation (2) is performed and control is performed according to Δd. The arithmetic unit 2γ sends out the output, and the interface (hereinafter referred to as I/F)
28m and 28b to digital-to-analog converters (hereinafter referred to as DaC) 29m and 29b, which send out analog control signals, which then pass through drive circuits 30a and 30b to control the top and bottom of each plate cylinder on which each plate is mounted. Drives the registers 31m and 31b for the register 111i.

Therefore, the motor 31a corresponds to the register mark 3& in FIG. 2(4), and the motor 31 corresponds to the register mark 3b.
b responds and register adjustment is performed.

However, each plate cylinder is provided with potentiometers 41a and 41b for detecting the vertical orientation position corresponding to the rotation reference angle, and a multiplexer 42 alternately selects these detection outputs at high speed to perform analog/daisymel conversion. Each detection output converted into a digital signal is sent to a digital signal converter (hereinafter referred to as ADC) 43, and is fed to a computing unit 2γ via an I/F 44. Check the target position of the motors 31a and 3, and when the desired position is reached or the adjustment limit position is reached,
The drive for 1bK is stopped.

FIG. 1 is a block diagram of the extraction circuit 22.

The output from the waveform shaping circuit 21 is given as an operating signal to the counter 52 via the switch 51, and the counter 52 receives the clock pulse C only during the detection signal period of the reference mark 2.
LK is counted, and if this count value is n or within a tolerance range of ±α for n, the determination circuit 53 determines this and then sets the latch circuit 54 to mJ# to hold the count value n in the latch circuit 54. This is sent to the arithmetic unit 21, and at the same time controls the gate pulse generation circuit 55 and causes a counter provided therein to count the clock pulse CLK. When this count value reaches nl, the circuit 55 starts exiting the gate pulse Pa and controls the switch 51 to switch to the input side of the gate circuit 560.

Further, the counter in the same circuit 55 continues counting, and when the count value reaches n+10n2, the gate pulse Pa
The transmission of is stopped and the count value is n! +n z +n s
If so, start sending out the gate pulse Pa again, and then
When the count value reaches n+ +nt 113+n2,
While stopping the transmission of the gate pulse Pa, the switch 5
1. The counter 522 discrimination circuit 53, latch circuit 54, etc. are reset, and the internal counter is also cleared to return to the initial state. .

Therefore, the detection signals of the register marks 3a and 3b are extracted by the gate circuit 56 as shown in FIG. 2, and unnecessary noise components are blocked.

Figures 4 and M5 show the printing status of each mark and a block diagram of the extraction circuit 22 showing other examples of printing. The length do of the reference mark 2 is made large so that no problem occurs even if the printing press rotates at high speed.

In addition, in FIG. 5, an addition/subtraction counter (hereinafter referred to as UDC)
) 61, up-counting is performed during the detection signal period of reference mark 2, and down-counting is performed outside the same signal period, and when the count value reaches zero, each part is reset. When the count value reaches n, the UDC 61 activates the gate pulse generation circuit 5.
5 l! 1i11 groans, and in response to the end of the detection signal of reference mark 2, the countdown is 2! il-wJ1 except start
It is similar to the figure.

Note that the gate pulse generation circuit 55 performs the following calculation to generate the gate pulse P. may be generated.

That is, if the relationship between the valley mark, the detection signal, and the gate pulse is shown in FIG. 6, the time t corresponding to the interval t is
t, the distance on the long paper 1 corresponding to the width of the gate node Pa (the width of the gate node Pa, tw), the following equation holds true.

Therefore, by calculating 12 and tW from equations (3) and (4), the following equations are obtained.

tw=-T
Fist ・ ・ ・ ・ (6
) d.

Therefore, find the time T as a count value.

By calculating equations (5) and (6) using known do, t, and w, time t1. If tw is a constant t and this is regulated by the count value of the gold counter, gate pulses P and J with accurate timing can be obtained.

Note that the gate pulse Pa corresponding to the register mark 3b
can be generated in the same way, and if a clock pulse that is synchronized with the rotation of the printing press is used.

The configuration of FIG. 5 can be applied to the second round.

However, the shape of each mark can be selected arbitrarily depending on the conditions, and the number of register marks 3a and 3b may be determined according to the number of plate cylinders, and they may be of the same color depending on the case. .

Further, the configuration shown in FIG. 3 may be determined depending on the situation, and if the drive circuits 30m and 30b respond to digital signals, the DACs 29a and 29b t-
Potentiometers 41a, 41 can be omitted.
A device that sends out digital signals can be used as a substitute for b.

ADC 43 can be omitted.

In addition, it can be applied not only to detecting register marks on a long sheet of paper but also to detecting register marks on a board. In FIGS. 1 and 5, the gate circuit 35 is omitted and the switch 31 The gate circuit may also be used as a gate circuit, the launch circuit 33 may be omitted depending on one condition, and it may be applied to the input side of the control circuit disclosed in each of the above-mentioned applications. , the various forms can be freely modified.

〔Effect of the invention〕

As is clear from the above description, according to the VC of the present invention, the shadow 4i due to the expansion and contraction of the long paper is eliminated.

Since the gate pulse for extracting the register mark detection signal is generated using the reference mark as a reference, the gate pulse is always generated at accurate timing without requiring adjustment to 1%, and the register mark detection signal can be reliably extracted. 1°, which is extremely effective in detecting and adjusting registration errors in various types of rotary printing presses with multiple plate cylinders.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Figure 1 is a block diagram of the extraction circuit, the second part is a diagram showing the printing status of each mark, and the same figure (
B) is a diagram showing the detection signal of each mark, and FIG. 3C is a diagram showing the counting status of clock pulses. FIG. 3 is a block diagram of the electric circuit for control, FIG. 4 is a diagram showing the printing status of each mark according to another embodiment, and FIG. 5 is a diagram showing the gate pulse. FIG. 6 is a block diagram of a corresponding extraction circuit, and is an explanatory diagram when a gate pulse is generated by calculation. 1... Long paper, 2... Reference mark, 2a...
・Front edge, 3a, 3b... Registration mark. 4...Scanning line, 5...1st line, 22...
...Extraction circuit, 24...Clock pulse generation circuit, 25, 52.61...Counter, 27...Arithmetic unit, 31a, 31b...Motor, 51...
・Switch, 55... Gate pulse generation circuit, 56
...Gate circuit, L...Specified interval.

Claims (1)

[Claims] When a gate circuit extracts a detection signal of a register mark printed at a specified interval following a reference mark on a long sheet of paper, a circuit that generates a gate pulse to turn on the gate circuit extracts a signal based on the detection signal of the reference mark. means for detecting the passage of time corresponding from the leading edge of the fiducial mark to an interval shorter than a regular interval between the fiducial mark and the register mark, and a pulse comprising a detection signal of the register mark in response to detection by the means; A gate pulse generation circuit for detecting a detection signal, comprising means for generating the gate pulse having a width.