JPS5851834B2 - Speed control device for printing presses and post-processing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a relative speed control device between a printing machine, a post-processing machine, and a printing paper, and to put it simply, it is a device for controlling the relative speed of a printing machine, a post-processing machine, and a printing paper. Or, it relates to a device that always accurately grasps the position of a punch hole when performing various post-processing operations, and uses a mounting device to accurately synchronize the rotational speed of a printing machine or post-processing machine with the traveling speed of printing paper.

In general, when performing printing such as offset printing or various processing on a long sheet of paper that has a large number of punched holes at equal intervals, such as form paper, there are two ways to feed the form paper: It can be roughly divided into two types: a case where the reference position of the form paper is always detected and the paper is fed while correcting the error with the printing position.

However, in the case of the former, there is a problem in that the strength of the punched holes inevitably makes it symmetrical with thick paper, which is impossible with thin paper such as copy paper.

Furthermore, in the case of the latter, although it is unrelated to the thickness of the paper, there are subtle differences in the paper feed amount depending on the roll diameter, nip amount, roll rotation amount, etc. At present, it is almost impossible to put it into practical use because an excellent method for constantly detecting deviations from the standard and correcting the errors has not been developed.

An object of the present invention is to provide a control device that detects punch holes and always synchronizes the rolls of a printing press, even if the paper has punch holes, such as form paper, and is extremely thin, such as copy paper. In particular, when using punched holes, check that the opening area of the punched holes is uneven, that debris adheres to the punched holes, that the punched holes are not necessarily in a straight line, etc. The object of the present invention is to provide a device that can sufficiently solve this problem.

That is, the present invention applies arbitrary tension to a long printing paper on which at least one side edge has preprinted marks made with continuous magnetic ink or the like at regular intervals, and then prints the paper using a printing machine or post-processing. a reference signal generator that generates a reference signal in accordance with the rotational speed of the printing machine or post-processing machine; and two detection jumpers that electrically detect marks on the running printing paper. A paper position that is arranged continuously in the running direction of the running printing paper, stores the detection output of each detection sensor at the time when the reference signal is generated, and outputs the difference between the stored values to detect the deviation of the mark. A drive unit of the printing press or post-processing machine based on a value obtained by adding or subtracting the output from the detection signal generating unit and the paper position detection signal generating unit at the time of generation of the reference signal to a value corresponding to the rotational speed of the printing machine or post-processing machine. The present invention relates to a speed control device for a printing press and a post-processing machine, which includes a means for controlling the speed of a printing press and a post-processing machine.

This invention allows a long sheet of paper, such as copy paper, to be passed through several stages of printing machines, and then to be subjected to post-processing such as perforations and post-printing. This system has a countless number of continuous striped marks at equal intervals, and the marks between them are detected by two magnetic detection sensors for each reference signal, so that the detected values of each sensor for the reference signal match. be.

FIG. 1 shows a schematic block diagram of the apparatus of the present invention, in which 1 is a reference signal generation section, 2 is a paper position detection section, 3 is a comparator circuit such as a differential amplifier, 4 is a drive control circuit, and 5 is a comparator circuit such as a differential amplifier. is, for example, a servo motor as a driving device for a printing press.

The drive device 5 rotates each roll of a series of printing machines, and the printing paper a suspended and fed by these rolls is also synchronized with the speed thereof.

The reference signal generator 1 may be one that generates any accurate lock pulse, that is, a reference signal, but a large number of marks are formed at minute and even intervals on a disk that rotates in synchronization with the printing machine, and these marks are placed adjacent to each other. A signal generating rotation 15a and its output circuit 16a are provided, which detect the signal by two detection sensors 13, amplify each detection output by an amplifier circuit 14, and generate a reference signal when the respective amplification values match. be.

The side edge of the printing paper a is provided with continuous marks similar to those in the reference signal generation section 1, and the paper position detection section 2 has two marks arranged consecutively in the running direction of the printing paper a. The mark is detected by the detection sensor 22, each detection output is amplified by the amplifier circuit 24, each amplified value at the time of generation of the reference signal is stored by the storage circuit 27 having the next gate circuit, and the difference between each stored value is , and the speed of the printing press are compared by a comparator circuit 3 to ensure synchronization between the printing paper and the printing press.

The marks are, for example, continuous stripes at intervals of about 10 m,
It is also possible to count the number of fringes during approximately the same interval as the reference signal generation interval and store the output, thereby controlling the deviation between the reference signal generation point and the count-up output.

Next, this invention will be explained in more detail based on the second figure below.

This is a case where punch holes are continuously punched at equal intervals on the side edge of the form paper, and the reference signal generating section 1
As shown in FIGS. 2 and 3, holes are formed at equal intervals on the outer periphery of a disk 10 that rotates synchronously through the impression cylinder 6, brush cylinder 7, plate cylinder 8, and gear group 9 of the printing press unit A. Two adjacent photosensors 13a and 13b that illuminate a large number of holes 11 with a floodlight 12 and detect the holes 11 on the back side thereof, and amplifier circuits 14a and 14b that amplify the output of each photosensor.
It includes a comparison circuit 15 and a monostable multi-circuit 16 that compare the two to find a point where the amplification values match and output an output at that point.

Further, as shown in FIGS. 2 and 5, the paper position detection unit 2 detects a roll 17 that interlocks with the impression cylinder 6 and the like, and a rotation shaft 6 of the impression cylinder 6.
Feed rolls 19 and 2 interlocked by a and belt 18
Two photosensors fixed adjacent to each other detect punch holes 21 continuously and equally spaced in the side edge of a form paper a supported by a paper sheet A and fed with a certain tension. 22a, 22b, the light projector 23, and amplifier circuits 24a, 24b that amplify the respective outputs of the photosensors 22a, 22b, respectively, and the output values of the amplifier circuits are differentiated by the reference signal from the reference signal generator 1. It is configured to include gate circuits 25a and 25b that input to the dynamic amplifier 3.

A drive control circuit 4 following the differential amplifier 3 increases or decreases the rotation speed of a servo motor 5 provided on the rotating shaft of the impression cylinder 6 based on positive and negative analog signals from the differential amplifier 3. It is.

Next, the operation of the present device will be described based on a more specific block diagram shown in FIG. 7 and explanatory diagrams of amplified detection waveforms shown in FIGS. 4 and 6.

two 7-point sensors 13a in the reference signal generator 1;
13b are amplified by amplifier circuits 14a and 14b, respectively, and the amplified values are compared by comparison circuit 15.

In this case, as shown in FIG. 4, when the output value of the first seven otosensors 13a is amplified by the amplifier circuit 14 for any one of the holes 11 of the disk 10, a waveform as shown by ctl is drawn. It turns out.

Subsequently, with a slight delay in time, the amplified waveform based on the output value of the next-stage 7-point sensor 13b becomes as shown by β1.

The respective waveforms α1°β1 are the photosensors 13a, 13
It is formed into a mountain shape along the opening of any hole 11 that passes through b, depending on the amount of transmitted light.

In other words, the apex of each waveform and the center of the apex indicate the center point of an arbitrary rotating hole, and this is done by comparing the amplification values of both and finding the point where the amplification values are equal. Obtained by growing.

When the comparison circuit 15 detects the matching point, the reference signal X is output from the monostable multi-circuit 16 at the time point X.

On the other hand, in the paper position detection unit 2, two photosensors 2 detect any hole 21 among the holes 21 of the traveling form paper a.
2a and 22b, and the respective detection outputs are input to amplifier circuits 24a and 24b.

The outputs of the amplifier circuits 24a and 24b are input to storage circuits 27a and 27b, respectively, via gate circuits 25a and 25b at the next stage, which are opened by the reference signal X, and the amplified values at the time when the reference signal X is generated are held.

After the output of one storage circuit 27b has its sign inverted by an inverter 28, each stored value is compared and the difference between each stored value is inputted to the differential amplifier 3.

In the differential amplifier 3, a frequency-voltage conversion circuit 29 converts the frequency of continuously generated pulse signals into a voltage value.
The frequency is converted into a voltage value by the pulse signal from the monostable multi-circuit 16 and inputted, and this voltage value is further compared with the comparison value of each output of the memory circuits 27a and 27b, and the form paper is Compare and detect whether the feeding speed is too fast or too slow.

In this comparative detection, as shown in the explanatory diagram shown in FIG. Draw β2.

Both waveforms α2 at the X position where the reference signal X is generated
When ゜β2 is equal and equal, that is, the state shown in Figure 6, the rotational speed of the printing press and the feeding speed of the form paper are synchronized because the reference signal generation point and the center of the hole 21 coincide. Therefore, no modification is required in this case.

However, if an error of +γ1 occurs between the time point Y when both amplified values are equal and the time point X when the reference signal is generated as shown in FIG. This means that

Therefore, the value corresponding to this 11 minutes is determined by the reference signal X generated at the reference signal generation time point X in each gate circuit 25a.
, 25b and each amplifier 24a at the reference signal generation time point X.

By storing each amplified value of 24b in the storage circuits 27a and 27b, the voltage value of the difference between the stored values is stored in the drive control circuit 4.
The servo motor should be delayed by 50 rotations by inputting the servo motor.

The rotational speed of the servo motor 5, that is, the rotational speed of any roll of the printing press, is detected by the tacho generator TG and is constantly fed back to the drive control circuit 4.
If the voltage value (the value for the difference between the memory values of each memory circuit 27a and 27b) is delayed by one minute, the state returns to the state shown in Fig. 6, so the servo motor 5 continues to maintain the current state. .

On the other hand, if a gap of -12 minutes occurs between the temporally equal time point Y of both amplified waveforms α2 and β2 and the reference signal generation time point X, as shown in FIG. 6C, this means that form paper a is delayed. voltage value proportional to r2 (each memory circuit 27a, 2
Servo motor 5 by the value corresponding to the difference between each memory value of 7b)
rotates at high speed.

The above is an example of detection for any one hole 21 of form paper a, but since these are performed continuously for a large number of holes arranged at equal intervals, if the punched holes are not aligned, In addition to being comprehensively corrected, the accuracy of feeding control of the punch hole position of the form paper is extremely increased by continuous detection control.

Note that the above description will be explained based on the time chart shown in FIG. 8. The photosensor 13a.

The amplified waveform α1.13b obtained by amplifying the detection signal. β
A reference signal X is generated at the time when the numbers 1 and 1 match.

Amplifier circuits 24a and 2 at the time when this reference signal X is output
The amplified value of 4b is stored in the storage circuit 27a.

27b, and a difference signal between the stored values is obtained.

Further, the frequency/voltage conversion circuit 29 generates a voltage based on the frequency of the reference signal X that is continuously generated, but this voltage is approximately constant because there is not much variation in the generation of the reference signal .

The voltage from this frequency/voltage conversion circuit 2a and a difference signal between the stored value are combined by a differential amplifier 3 to control the speed of the drive device 5.

Although the above embodiment is an example of detection control based on punched holes in a form paper, for example, a mark may be printed in advance on the side edge of another long paper, and this mark may be detected photoelectrically.

Furthermore, if the mark is made using magnetic ink, the same effect can be obtained by using a magnetic detection sensor.

As described above, in this invention, consecutive marks are made in advance at equal intervals on the side edge of a continuous long sheet of paper to be printed, and each of these marks is detected by two detection sensors. Then, one of these marks is detected by two detection sensors, the detection output of each detection sensor at the time when the reference signal is generated is stored, and the deviation of the mark is detected based on the difference between the stored values. Since it is designed to control the rotational speed of the printing press or post-processing machine, it is possible to always align the mark position with the reference position of the printing press, and also to keep track of the roll rotational speed of all printing presses and the printing paper. This has the advantage of being able to synchronize the running speed of the 5f3E with extremely high precision.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a block diagram comprehensively showing the invention, and FIG.
The figure is a schematic perspective view when feeding form paper to a printing machine, Figure 3 is a partial perspective view showing a part of the reference signal generation section, and Figure 4 is when the detection output from Figure 3 is amplified. FIG. 5 is a partial perspective view showing a part of the paper position detection section. FIG. 6 is an explanatory diagram showing the waveform when the detection output from FIG. 5 is amplified. Figure, 7th
The figure is a block diagram, and FIG. 8 is a time chart in FIG. 7. 1... Reference signal generation section, 2... Paper position detection section, 3
... Differential amplifier, 4 ... Drive control circuit, 5 ... Servo motor, 6 ... Impression cylinder, 7 ... Plan cylinder, 8 ...
・Print cylinder, 9... Gear group, 10... Disc, 11...
Hole, 12, 23... Floodlight, 13a, 13b, 22a
, 22b...photo sensor, 14a, 14b, 24a
, 24b...Amplification circuit, 15...Comparison circuit, 16.
... Monostable multi-circuit, 17.19,20... Roll, 18... Belt, 21... Punch hole, 25a, 2
5b...gate circuit, 27a. 27b...Storage circuit, 28...Inverter, 29.
...Frequency/voltage conversion circuit.

Claims (1)

[Scope of Claims] 1. Applying arbitrary tension to a long printing paper with marks such as regularly spaced and continuous punch holes on at least one end of the paper to send it to a printing machine or a post-processing machine. a reference signal generator that generates a reference signal in accordance with the rotational speed of the printing press or post-processing machine; and two detection sensors that electrically detect marks on the running printing paper. a paper position detection signal generation unit that is arranged continuously in the paper running direction, stores the detection output of each detection sensor at the time when the reference signal is generated, and outputs a difference between the stored values to detect a shift of the mark; and means for controlling the driving unit of the printing press or post-processing machine based on a value obtained by adding or subtracting the output from the paper position detection signal generating unit at the time when the reference signal is generated to a value corresponding to the rotational speed of the printing machine or post-processing machine. A speed control device for a printing press and a post-processing machine, comprising: 2. A speed control device for a printing press and a post-processing machine according to claim 1, wherein the printing paper is a thin foam paper having punch holes at the side edges. 3. Speed for the printing press and post-processing machine according to claim 1, wherein the marks on the printing paper are preprinted with magnetic ink or other ink at regular intervals and in a continuous manner. Control device. 4 The reference signal generation unit detects holes drilled at equal intervals on the periphery of a disk that rotates in synchronization with the rotational speed of the printing machine or post-processing machine using two adjacent light-receiving elements, and detects that both side output values are equal. 2. A speed control device for a printing press and a post-processing machine according to claim 1, wherein the speed control device outputs a reference signal at a certain point in time.