JPH09220802A - Damping water detector for offset rotary printing press - Google Patents

Abstract

(57) [Summary] [Structure] Low-frequency, high-frequency waves to the sprayed dampening water near the spray-type dampening water supply nozzle of the offset rotary printing press.
The present invention relates to a dampening water detection device including a generator that generates an ultrasonic wave or a pneumatic wave, a wave receiver that detects energy rays, and a unit that detects the presence or absence of dampening water based on a signal from the wave receiver. [Effect] Whether the printed matter is good or bad can be judged by the presence or absence of the supply of dampening water, and since a detector is provided for each nozzle, it is easy to judge the faulty part and repair can be done in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dampening water detection apparatus suitable for an offset rotary printing machine, particularly a high-speed newspaper rotary printing machine, and a printing method for discharging defective printed matter.

[0002]

2. Description of the Related Art Conventionally, a dampening water supply device for a newspaper offset rotary printing press has mainly been a brush type, but in recent years, a spray type dampening water supplying device for spraying and jetting water has been developed and used. Has become. This spray-type dampening water supply device directly sprays fine water droplets onto the water source roller, and high-quality printing can be obtained.

However, ink sprayed during printing, fine dust and the like clog the spray injection port, and the supply of dampening water is partially stopped, so that high-quality printing cannot often be maintained. . In particular, when an appropriate amount of dampening water was not supplied to the non-image area, solid printing occurred in the non-image area, resulting in defective printing. In order to prevent the occurrence of this defective printed matter, it is necessary to visually inspect the printed matter at all times, or a high-performance but extremely expensive paper surface inspection device must be installed instead of manpower, resulting in high cost. .

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a dampening solution capable of promptly and accurately detecting defective printed matter based on poor supply of dampening water and quickly eliminating the detected defective printed matter. It is an object of the present invention to provide a detection device and a printing method for discharging defective printed matter.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a generator for emitting an ultrasonic wave or a pneumatic wave toward water to be jetted, in the vicinity of an injection port of a dampening water supply nozzle of an offset rotary printing press, and the generation thereof. Offset rotary wheel having a wave receiving section for receiving an energy wave from the section and a dampening water detecting section for judging whether dampening water is being supplied based on a signal from the wave receiving section. The present invention relates to a dampening water detection device for a printing machine.

The present invention also relates to a dampening water detection device for the offset rotary printing press, wherein the wave receiving portion receives the energy wave reflected from the dampening water. The present invention also relates to a dampening water detection device for the above offset rotary printing press, in which the wave receiving portion receives the energy wave transmitted through the dampening water.

Further, according to the present invention, a plurality of generators and wave receivers are provided in a row at intervals and are installed in the vicinity of a nozzle of a dampening water supply device for intermittently or continuously injecting water. The present invention also relates to the dampening water detection device.

The present invention also relates to the dampening water detecting device, wherein the generating portion and the wave receiving portion are installed so as to be located on opposite sides of the dampening water supplying device. Further, according to the present invention, the generating unit and the wave receiving unit are located on the same side, and the reflecting unit for reflecting the energy ray from the generating unit is installed on the opposite side so as to receive the energy ray from the reflecting unit. The dampening water detecting device in which the wave receiving portion is installed.

Further, according to the present invention, the dampening water is supplied to the dampening water supply device intermittently and at different timings from each other by spraying the water, and the dampening water supply device is installed near each of the plurality of nozzles. The present invention relates to a water detector.

Further, according to the present invention, the dampening water detecting section includes means for sampling the signal from the wave receiving section, and the timing of the sampling coincides with the timing of supplying the dampening water intermittently ejected from the nozzle. The above-mentioned dampening water detection device.

Further, the present invention relates to the dampening water detecting device having a function of receiving a signal from the dampening water detecting section and generating a signal for operating an excluding mechanism for excluding defective printed matter.
Further, the present invention, at the time of printing, low frequency toward the water ejected from the ejection port of the dampening water supply nozzle of the offset rotary printing press,
The present invention relates to a printing method which emits a high frequency wave, an ultrasonic wave, or a pneumatic wave, receives the wave, and discharges a defective printed material when it is detected that the dampening water is not supplied.

[0012]

1 is a diagram schematically showing a part of the construction of a printing unit of a rotary printing press to which a dampening water detecting device of the present invention is applied. A plate cylinder 1, a blanket cylinder 2, and a blanket. The body 3, the swimsuit roller 4, the water source roller 5, the dampening water supply device 6, and the printing paper 7 are shown, respectively. In addition, plate cylinder 1
There is an ink roller in contact with, but it is omitted in the figure.

In offset printing, a printing plate having a lipophilic image portion and a hydrophilic non-image portion on the surface is a plate cylinder 1.
The dampening water is first supplied to the printing plate through the swimsuit roller 4. At this time, the water is supplied to the non-image area, and the water is repelled in the image area. Next, the ink is applied to the image area by an ink roller (not shown). The ink in the image area on the plate cylinder 1 is transferred and printed on the running printing paper 7 via the blanket cylinder 2. In such an offset printing machine, if the appropriate amount of dampening water is not supplied to the non-image area of the plate, the ink is also supplied to the non-image area and printing on the plate becomes impossible and defective. It will be printed.

The dampening water detection apparatus of the present invention is of a type in which the dampening water supply apparatus 6 shown in FIG. 1 supplies dampening water in the form of fine water droplets or mist, and the dampening water supply apparatus 6 damps the dampening water. It detects whether or not an appropriate amount of water is supplied.
The main body of the dampening water supply device may be a conventionally known one, and one that sprays water continuously or intermittently is used.

FIG. 2 is a block diagram showing an example of the dampening water detecting device of the device of the present invention. In this example, in order to make the explanation easy to understand, from the modulator 9, the cable 10 and the generator 8 for generating energy waves. And a wave-receiving unit 13 including a wave-receiving unit 14 and an amplifier 15 such as an amplifier and an A / D converter.
It is shown that there is only one set of. As the generator 8, a general device that generates low frequency, high frequency, ultrasonic waves or pneumatic waves is used. FIG. 2A is a block diagram showing a dampening water detection device when the energy wave emitted from the generator 8 passes through the dampening water and is received by the wave receiver 14. ) Is a block diagram showing a dampening water detection device in the case where the energy wave emitted from the generator 8 passes through the dampening water, is reflected by the reflecting portion 22, and then is received by the wave receiver 14. FIG. 2C is a block diagram showing the dampening water detection device in the case where the energy wave emitted from the generator 8 is reflected by the surface of the dampening water and then received by the wave receiver 14.

About 95% of the amount of light emitted from the generator 8 to the dampening water is transmitted and about 5% is reflected, and the amount of received wave is measured by the wave receiver 14. The energy ray from the generator 8 is emitted vertically to the water surface 12 of the dampening water or at an appropriate angle with respect to the vertical reference line L of the water surface 12, preferably around 45 degrees. The energy ray transmitted through the dampening water is received by the wave receiving portion 14 as it is, or is reflected by the reflecting portion 22 having high reflection efficiency, and then the post-generating portion 1 is generated.
The wave is received by the wave receiving unit 14 on the same side as 1. Reflector 22
An energy ray transmitted through the dampening water at an appropriate angle is incident on, and then reflected and received by the wave receiver 14. Alternatively, the amount of the energy ray from the generating unit 11 reflected on the surface of the dampening water is received by the wave receiving unit 14. Receiver 14
Has an energy conversion element, and the voltage output by this element is weak and is amplified by an amplifier.
D-convert. The controller 16 receives the output signal from the wave receiving unit 13 and the dampening water supply signal provided to the dampening water supply device 6, and when the dampening water supply signal is present, is the dampening water actually supplied? It is a circuit that determines whether or not.

FIG. 3 shows the input and output signals of the controller 16. In this figure, the signal a is the receiving unit 13
Is a dampening water control signal from the dampening water supply device, and signal c is an output signal of the controller 16. In this figure, at time TN, the dampening water is not being injected, and the controller 16 outputs a signal indicating that the dampening water is not properly supplied. This controller 16
The output signal from the device is sent to an alarm device (not shown) to notify the operator of the printing machine that the dampening water supply device is defective. Further, this signal is sent to the defective paper ejection device controller 17 provided in the newspaper conveying device, and the publicly known emergency paper ejection mechanism 19 is operated by the signal from the controller 17 to exclude the defective paper from the flow of good paper.

FIG. 4 is a schematic side view of the newspaper conveying device, FIG. 4 shows a state where normal printed paper of the newspaper 20 is flowing in the conveying path, and FIG. 5 shows a state where defective paper is discharged. There is. The newspaper conveying device 18 is erected by a defective paper ejecting device controller 17 and an emergency paper ejecting mechanism 19 which is rotated by a drive unit operated by a signal from the controller 17 when the printing paper is a normal printing paper, and when it is a defective paper, it falls down. .

The controller 1 of the dampening water detection device
There is a time lag between the timing at which the output signal from 6 is generated and the timing at which the defective paper ejection device operates, and this time difference is due to the delay time in the defective paper ejection device controller 17 that is proportional to the operating speed of the printing press. Is calculated by the circuit that calculates
In addition, when the output signal from the controller 16 of the dampening water detection device disappears, that is, when the dampening water supply is normally returned, the defective paper discharge device is also returned to a state in which normal printing paper is conveyed. Similarly, they are operated with a time difference.

In FIG. 6, a large number of dampening water injection nozzles 21 are provided at substantially constant intervals, and the combination of the generator 8 and the wave receiving portion 13 of the dampening water detection device is on the same side, that is, the dampening water injection nozzle 21. FIG. 4 is a plan view showing a dampening water supply device 6 and a water source roller 5, which are provided on the upper side for one set per injection nozzle. Figure 7
FIG. 7A is a schematic cross-sectional view having a reflecting portion 22 in FIG. 6, and FIG. 7B is a schematic cross-sectional view in the case where the wave receiving portion 13 is installed below the dampening water jet nozzle 21 in FIG. FIG. 7C is a schematic sectional view of the case where the energy rays reflected on the surface of the dampening water in FIG. 6 are received.
The modulator 9 is collected in each wave generator 8, and the output of each wave receiver 13 is collected in the controller 16. The controller 16 determines which injection nozzle is normal or defective.
If any one of them has a defect, the above-mentioned defective paper ejecting device may be operated, or it may be preset and operated when some of the nozzles are defective.

The generator 8 is not particularly limited as long as it is a device which can generate generally used low-frequency, high-frequency, ultrasonic waves and pneumatic wave energy rays, but a generator whose intensity can be controlled is preferable.

In the present invention, using the above-mentioned device,
At the time of printing, an energy wave is emitted toward the water jetted from the jet of the dampening water supply nozzle of the offset rotary printing press.
The energy wave reflected or transmitted through the water is received, the amount of the received wave is measured, and then the computer automatically manages whether the received amount of water is the dampening water or not. When it is detected that the dampening water is not supplied on the basis of the amount, the defective printed matter can be automatically discharged from the continuously printed printed matter and, if necessary, manually discharged.

[0023]

According to the present invention, the presence or absence of supply of dampening water ejected from the nozzle is photoelectrically detected by the energy ray generating portion and the wave receiving portion, and based on the result, defective printed matter is eliminated. It is possible to check and operate automatically at a remote place without visually checking. As a result, defective prints are overlooked as normal prints, troubles at the delivery destination of the printed matter, customers,
Accidents can be prevented efficiently in advance. Further, by providing a dampening water detection device, in particular, a set of generators and wave receivers corresponding to each nozzle provided in a row in this device, the supply of dampening water is defective at which nozzle in which region. It is possible to check at a glance whether or not it is, and since the failure part of the dampening water supply device can be seen, the repair can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a configuration of a printing unit of a rotary printing press to which a dampening solution device of the present invention is applied.

FIG. 2 is a block diagram showing an example of a dampening water detection device of the present invention, FIG. 2 (a) is a block diagram in which a wave receiving portion is installed below dampening water, and FIG. Is a block diagram where the wave receiving part is installed so as to receive the energy rays from the reflecting part,
Further, FIG. 2 (c) is a block diagram for receiving the energy rays reflected on the surface of the dampening water.

FIG. 3 is a diagram showing an input signal and an output signal of a controller.

FIG. 4 is a schematic view of a newspaper conveying device, showing a state in which normal newspaper printing paper is flowing in a conveying path.

FIG. 5 is a schematic view of a newspaper conveying device showing a state in which defective paper of a newspaper is being discharged.

FIG. 6 is a diagram showing an example in which a set of a generator and a wave receiving unit is provided for each injection nozzle.

FIG. 7 is a partial cross-sectional view of a dampening water detection device of the present invention and a water source roller. FIG. 7 (a) is a schematic cross-sectional view in which a wave receiving portion is installed above an injection nozzle, and FIG. ) The figure is a schematic cross-sectional view with the wave receiver installed below the injection nozzle.
FIG. 6C is a schematic cross-sectional view when receiving the energy rays reflected on the surface of the dampening water.

[Explanation of symbols]

 1 plate cylinder 2, 3 blanket cylinder 4 swimwear roller 5 water source roller 6 dampening water supply device 7 printing paper 8 generator 9 modulator 10 cable 11 wave generating part 12 dampening water surface 13 wave receiving part 14 wave receiving device 15 Amplifiers such as amplifiers and AD converters 16 Controller 17 Defective paper ejection device controller 18 Newspaper transport device 19 Emergency paper ejection device 20 Folded newspaper 21 Dampening water jet nozzle 22 Reflector

Claims (10)

[Claims] 1. A generator that emits low-frequency, high-frequency, ultrasonic waves, or pneumatic waves toward the jetted water in the vicinity of the jetting port of the dampening water supply nozzle of an offset rotary printing press, and a generator from the generator. An offset rotary printing press, comprising: a wave receiving unit that receives an energy wave; and a dampening water detection unit that determines whether dampening water is being supplied based on a signal from the wave receiving unit. Dampening water detection device. 2. The dampening water detecting device for an offset rotary printing press according to claim 1, wherein the wave receiving portion receives the energy wave reflected from the dampening water. 3. The dampening water detection device for an offset rotary printing press according to claim 1, wherein the wave receiving portion receives the energy wave that has passed through the dampening water. 4. A plurality of generators and receivers are provided in a row at intervals and are installed in the vicinity of a nozzle of a dampening water supply device for intermittently or continuously ejecting water. The dampening water detecting device according to claim 1 or 2. 5. The dampening water detecting device according to claim 1, wherein the generating unit and the wave receiving unit are installed so as to be located on opposite sides of the dampening water supplying device. 6. The generating unit and the wave receiving unit are located on the same side, and a reflecting unit for reflecting the energy ray from the generating unit is installed on the opposite side so as to receive the energy ray from the reflecting unit. The dampening water detecting device according to claim 3, wherein the wave receiving portion is installed in the. 7. A generator and a wave receiver are installed in the vicinity of each of a plurality of nozzles of a dampening water supply device that sprays water intermittently and at different timings from each other. The dampening water detection device according to any one of claims 1 to 6. 8. The dampening water detection unit includes means for sampling a signal from the wave receiving unit, and the sampling timing coincides with the supply timing of dampening water ejected intermittently from the nozzle. The dampening water detection device according to any one of claims 1 to 7. 9. The dampening solution according to claim 1, which has a function of receiving a signal from the dampening water detection unit and generating a signal for operating an elimination mechanism for eliminating defective printed matter. Water detector. 10. A low-frequency wave, a high-frequency wave, an ultrasonic wave, or a pneumatic wave is emitted toward water jetted from a jet of a dampening water supply nozzle of an offset rotary printing press at the time of printing, and the wave is received to dampen the water. A printing method characterized in that defective prints are discharged when it is detected that water is not supplied.