JPH0428764Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a flatbed proofing press used for proofing printed matter.

[Technical background of the invention and its problems]

For proofing printed matter, for example, a flatbed proofing press shown in FIG. 8 is used. That is, a printing paper 2 and a printing plate 3 are placed on a surface plate 1, a dampening roller 5 and an ink roller 6 provided in a water tank 4 are installed, and a dampening roller and an ink roller are mounted on a pedestal 7. A roller and a blanket roller (none of which are shown) are attached, and as the pedestal 7 moves on the surface plate 1, the swimsuit roller, ink form roller, and blanket roller also move together. As a result, dampening water and ink are attached to the printing plate 3,
This ink is further transferred to a blanket roller, and then transferred from the blanket roller to the printing paper 2 for printing.

In general, in proof printing using a proof printing machine,
A method has been adopted in which a picture area and a print management scale for each color are printed on printing paper, and print management data such as print density is obtained from the print management scale to manage printing.

Conventionally, in order to obtain print management data from a print management scale, each time a printing operator prints, he or she removes the printing paper from the proofing press, carries it to the location where the densitometer is installed, and operates the densitometer. The density is measured using a print control scale for printing paper.

However, according to this method, obtaining print management data is a very time-consuming task, and the printing of the proof printing press is stopped every time density measurement is performed. There is a problem in that the state of the ink changes and printing conditions cannot be kept constant.

Therefore, recently, a data detection device for print management has been installed on the stand of a flatbed proofing printer. A flatbed proofing printing machine has been proposed in which the information is displayed on a display device. This method has the advantage that it is possible to easily and accurately measure the density at the same time as proof printing, and to improve the working efficiency of proof printing management.

However, even with this type of flatbed proofing printer, there are still problems that need to be solved. That is,
The print management data detection device includes a light source that irradiates light onto a print management scale of printing paper, and a light receiving element that measures data by photoelectrically converting the reflected light, and includes a measurement opening on the bottom of the device. It is equipped with a transparent protective cover and is attached to the stand of the flatbed proofing press and moves along with it. However, dust may adhere to the outer surface of the protective cover of the detection device, and when the pedestal is moved over the water tank on the surface plate, water may fly off due to the rotation of the dampening water roller and water droplets may adhere to the outer surface of the protective cover. be. For this reason,
The light from the light source of the detection device is reflected by the print management scale and passes through the protective cover on which the dust and water droplets have adhered, and the light receiving element receives the reflected light, which also includes the presence of dust and water droplets, to manage the print. Since the density information is measured as the density information of the printing management scale, the density of the printing management scale cannot be accurately measured because the density is measured incorrectly.

Furthermore, in order to remove dust and water droplets adhering to the protective cover, the flatbed proofing printer must be stopped and the printing operator manually performs the work, which is cumbersome and reduces the efficiency of proof printing. .

[Purpose of invention]

This invention was made based on the above circumstances,
It automatically prevents foreign matter from adhering to the protective cover of the data detection device for print management installed on the mount and removes the foreign matter that has adhered to it, allowing the detection device to accurately measure data on the print management scale while also protecting the data. An object of the present invention is to provide a flatbed proofing printing machine that can prevent and remove foreign matter from adhering to a cover without affecting printing work.

[Summary of the idea]

The flatbed proofing printing machine of the present invention is equipped with a device that blows compressed air onto the outer surface of the protective cover of the print management data detection device installed on the stand to eliminate foreign matter. A nozzle that injects compressed air toward the nozzle, a means for supplying and stopping the supply of compressed air to the nozzle, and a means for detecting when to inject the compressed air. be.

[Example of idea]

An embodiment of the present invention will be described below with reference to drawings.

1 to 7 show an embodiment of the present invention.

Figure 1 shows the entire flatbed proofing press.
An ink roller 12 is provided at one end of the surface plate 11, and a dampening water roller 14 immersed in a water tank 13 is provided at the other end. (not shown) is also provided. On the surface plate 11 is a printing plate 16
and the printing paper 17 is placed. And pedestal 15
In the process of moving on the surface plate 11 in the C direction from position A1 at one end of the surface plate 11 to position B at the other end, dampening water and ink are applied to the printing plate 16 by a wet roller and an ink roller. , then move the frame 15 to B
In the process of moving in the D direction on the surface plate 11 from position A to position A, the ink on the printing plate 16 is transferred to the blanket roller, and the ink on the blanket roller is further transferred to the printing paper 17 to perform printing. As a result, the pattern section 18, print management scale 19, and timing scale 20 are printed on the printing paper 17.

On one side of the pedestal 15, as shown in FIG.
For example, two print management data detection devices 21 are provided at positions corresponding to the print management data detection devices 21. As shown in FIGS. 2 to 4, this detection device 21 is connected to a main body 22 of the device.
(Scale 1 for print management of printing paper 18)
A measuring opening 23 is formed in the part facing the body 9), a transparent protective cover 24 is attached, and
2 includes a lamp 25 that irradiates light onto the print management scale 19 through a protective cover 24, and a lamp 25 that receives the reflected light from the print management scale 19 through the protective cover 24 through a lens 26 and converts it photoelectrically. Accordingly, a light receiving element 27 for detecting print management data is provided. Further, a timing sensor 28 is provided on one side of the pedestal 15 to detect the timing mark 20 on the printing paper 17.
is provided. Note that the pedestal 15 is equipped with a light receiving element 27.
A data processing circuit is provided for processing the data detected by the sensor.

Next, a device for blowing compressed air onto the protective cover 24 of the print management data detection device 21 is installed.
5 through 5 will be explained. Air nozzles 29 for ejecting compressed air are provided on the lower surface of the main body 22 of each print management data detection device 21, and air reflection pairs 30 are provided for receiving and reflecting the compressed air ejected from the air nozzles 29. Each is provided. The air nozzle 29 is positioned so as to inject compressed air horizontally onto the outer surface of the protective cover 24 provided in the measurement opening 23 of the device main body 22 and toward the air reflector 30, and The body 30 is sized and positioned so as to receive the compressed air injected from the air nozzle 29 and reflect it toward the entire area of the protective cover 24. Further, the pedestal 15 is provided with an air passage 31 that is connected to each air nozzle 29 provided in the main body 22 of each detection device 21 and through which compressed air flows, and a solenoid valve 32 that opens and shuts off the air passage 31. There is. On the other hand, for example, an air tank 33 as a compressed air supply source is provided at the other end of the surface plate 11, and this air passage is connected to the pedestal 15 via a solenoid valve 32 by a flexible hose (not shown). 3
Connected to 1. In addition, a limit switch 34 is attached to the side of the surface plate 11 located near the water tank 13 provided at the other end of the surface plate 11, and the pedestal 15 moves in the C direction to reach the vicinity of the water tank 13. An operating pawl (not shown) provided on the pedestal 15 operates the limit switch 34. This limit switch 34 is connected to the solenoid valve 32.
The solenoid valve 32 is opened or closed by turning on or off the excitation current to the electromagnet by turning the limit switch 34 on or off.

The operation of the flatbed proofing printing machine configured as described above will be explained. First, the mount 15 is moved on the surface plate 11 from position A to position B in the direction C to apply ink to the printing plate 16. The print management data detection device 21 also moves together with the gantry 15. Here, the pedestal 15 is located near the B position, that is, the water tank 1
3, the operating claw provided on the pedestal 15 operates the limit switch 34 provided on the surface plate 11. The operation of the limit switch 34 opens the solenoid valve 32 of the air passage 31 provided in the pedestal 15, and compressed air is supplied from the air tank 33 via the hose, the solenoid valve 32, and the air passage 31 to each print management data detection device 21. The air is supplied to an air nozzle 29 provided in the main body 22 of the device. Furthermore, the compressed air is supplied from the nozzle 29 to the protective cover 24 of the device main body 22.
is injected toward the outer surface of the air reflector 30.
It is reflected and diffused toward the entire protective cover 24. As a result, the entire outer surface of the protective cover 24 is covered with compressed air injected from the air nozzle 29.
Therefore, if foreign matter such as dust is attached to the protective cover 24, the foreign matter is blown away by the compressed air and removed. When the pedestal 15 reaches position B, the dampening water roller 14 in the water tank 13 rotates and attaches water to the water tank roller of the pedestal 15.
At this time, water droplets are splashed up by the rotation of the dampening water roller 14. The print management data detection device 21, which has moved together with the pedestal 15, receives water from the dampening water roller 14 above the water tank 13. However, since the protective cover 24 of the device main body 22 of the detection device 21 is covered with compressed air jetted from the air nozzle 29, the water from the dampening water roller 14 is blocked by the layer of compressed air and is not splashed. It will not be blown off and attached to the outer surface of the protective cover 24. In this way, foreign matter adhering to the protective cover 24 is automatically removed by blowing compressed air. Next, the pedestal 15 moves in the D direction from the B position to the A position. When the pedestal 15 is separated from the water tank 13, the operating pawl operates the limit switch 34. As a result, the electromagnetic valve 32 closes, the supply of compressed air from the air tank 33 to the air passage 31 is interrupted, and the injection of compressed air from the air nozzle 29 is stopped. Further, the mount 12 is attached to the printing paper 17 along with the pattern section 18, a print management scale 19, and a timing mark 2.
After printing 0, when the timing sensor 28 provided on the pedestal 15 detects the timing mark 20 on the printing paper 17, each print management data detection device 2
1 scans the printing management scale 19 of the printing paper 17 to measure density information. That is, the print management data detection device 21 transmits the light from the lamp 25 through the protective cover 24 and irradiates the print management scale 19, and the light reflected from there is transmitted through the protective cover 24 and is received by the light receiving element 27. Concentration is measured by photoelectric conversion. In this case, since no foreign matter is attached to the protective cover 24, the reflected light does not change when passing through the protective cover 24, allowing accurate measurement. The data obtained by the detection device 21 is sent to a data processing circuit provided on the pedestal 15, and is stored in the data storage means 35 as shown in FIG. It is input to the calculation means 37. Arithmetic means 3
In step 7, calculations are performed to obtain data indicating the printing status by obtaining data necessary for printing management based on the measured data, or by comparing both of the above-mentioned data and obtaining the difference. The calculation results are displayed on a separate display 36. When the timing sensor 28 finishes detecting the timing mark 20, the density measurement by the print management data detection device 21 ends.

[Effect of idea]

As explained above, the flatbed proofing printer of the present invention is equipped with a device that blows compressed air onto the outer surface of the protective cover attached to the measurement opening of the data detection device for print management installed on the stand. By blowing air onto the outer surface of the cover,
Printing work can be performed efficiently by eliminating dust and water droplets adhering to the protective cover without manual intervention, and the data on the print management scale can be accurately grasped. In addition, equipment that blows compressed air is
It is equipped with a nozzle that sprays compressed air toward the protective cover, a means for supplying and stopping compressed air to this nozzle, and a means for detecting when to spray compressed air, making it easy to print. The action is to spray compressed air at a point where it does not cause any impact and eliminate dirt and water droplets from adhering to the protective cover.
This can be done without affecting printing work.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, and FIG. 1 is a plan view showing a flatbed proofing printing machine;
Figures 2 to 4 are longitudinal cross-sectional views, cross-sectional views, and bottom views showing the data detection device for print management, Figure 5 is an explanatory diagram showing the schematic configuration of the compressed air blowing device, and Figure 6 is data detection. FIG. 7 is a block diagram showing the flow of printing management data processing, and FIG. 8 is a perspective view showing a conventional flatbed proofing printer. DESCRIPTION OF SYMBOLS 11... Surface plate, 15... Frame, 21... Print management data detection device, 22... Device main body, 24...
...protective cover, 25 ... lamp, 27 ... light receiving element, 29 ... air nozzle, 30 ... air reflector,
31...Air passage, 32...Solenoid valve, 33...Air tank, 34...Limit switch.

Claims (1)

[Claims for Utility Model Registration] (1) Flat bed proof printing in which printing paper and a printing plate are placed on a surface plate, and a stand having a blanket roller moves on the surface plate to print on the printing paper. In the machine, a lamp that irradiates light through the measurement opening onto a printing management scale printed on the printing paper on a device body mounted on the mount and having a measurement opening formed therein; and the printing management scale. a light-receiving element that measures print management data by receiving the light reflected by the opening through the opening and photoelectrically converting the light;
a print management data detection device having a protective cover attached to the measurement opening; and a device for blowing compressed air onto the outer surface of the protective cover attached to the measurement opening; A flatbed proofing printing machine that is equipped with a nozzle that sprays compressed air toward a protective cover, a means for supplying and stopping compressed air to the nozzle, and a means for detecting when to spray the compressed air. . (2) The means for detecting when to inject compressed air is
The flatbed proofing printing machine according to claim 1, which is a utility model registered for detecting that the print management data detection device is located near a dampening water supply device provided on a surface plate. (3) A utility model registered as claimed in claim 1 or 2, in which a member for controlling the flow of compressed air injected from a compressed air injection nozzle is provided in the main body of the data detection device for print management. Flatbed proof printing machine.