JPS6382750A - Ink feed nozzle - Google Patents

Abstract

PURPOSE:To enable a minute amount of ink to be fed to a roller during its rotation by discharging it from an ink discharge pipe, by providing an air discharging means jetting air parallel to ink around the ink discharged from the ink discharge pipe. CONSTITUTION:When a solenoid valve 24 is opened, compressed air is supplied to a cylinder hole 20, and an air operating piston 21 is pushed downward to open a needle 12. Thereby, the ink of a high pressure in an ink feed pipe 5 is sent into an ink discharge pipe 10, and discharged from its top. Then, when the solenoid valve 24 is closed, the compressed air in a cylinder hole 20 is discharged to a pipe line 26 and the air pressure acting on the air operating piston 21 vanishes. Therefore, the needle 19 is forced onto a valve seat 18 with a coil spring 22 to close the valve, and the ink discharge from an ink feed nozzle 4 is stopped. The needle 19 is opened and closed once by the opening and closing once of the solenoid valve 24. A fixed amount of ink determined by the open time of the needle 19 is discharged, in a long narrow manner, from each ink feed nozzle 4 and satisfactorily supplied to an ink distributing roller.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an ink supply nozzle that supplies ink to printing machines such as double proofing machines, offset printing machines, letterpress printing machines, etc. This invention relates to an ink supply nozzle that can supply ink in small amounts.

[Conventional technology]

There are two ways to supply ink to the calibration machine: one is to supply a relatively large amount of ink to the ink mixing roller at the start of operation of the calibration machine, and the other is to supply a relatively large amount of ink to the ink mixing roller at the beginning of operation, and the other is to supply ink to the ink mixing roller to correct density unevenness in the width direction during operation. A very small amount of ink may be supplied locally. In either case, conventionally, an operator supplies ink directly to the ink mixing roller using an ink spatula.

[Problem that the invention seeks to solve]

However, this method places a heavy burden on the nine workers because it is done manually, and the amount of ink supplied in the width direction of the roller is dependent on intuition, requiring extremely high skill and resulting in individual differences. There were other problems.

An automatic ink supply device that automatically supplies ink to an ink roller of a proofing machine is proposed in Japanese Utility Model Application Publication No. 175637/1983. This device supplies a fixed amount of ink to the ink roller by discharging a fixed amount of ink from an ink discharging section and moving the ink discharging section at a constant speed along an ink roller. However, although this device may be used to supply ink to the entire ink roller at the start of operation of the proofing machine, in order to correct density unevenness in one width direction during operation of the two proofing machines, it is necessary to supply ink locally to the ink roller. In other words, the amount of ink supplied to correct density unevenness is usually about 0.01 to 0.05 g, and gear pumps cannot be used to supply such a small amount of ink. Therefore, it cannot be used to supply different amounts of ink to different positions in the width direction of the ink roller in order to correct density unevenness.

As a result of various studies on techniques for quantitatively supplying such a small amount of ink, the inventor of the present invention has developed a method for supplying a small amount of ink by using a needle valve and controlling the opening time of the needle valve while keeping the ink pressure acting on the needle valve constant. It was discovered that it is possible to supply ink of However, when attempting to discharge a very small amount of high viscosity ink, approximately 0.01 to 0.05 g, from a small diameter ink discharge tube and supply it to the rotating ink mixing roller, as shown in Figure 6, the ink The ink 15a discharged from the discharge tube 10 may curl into a droplet shape at the tip of the ink discharge tube 10, as shown in FIG.

When the elongated ink 15b is ejected, it curves in the opposite direction and adheres to the ink ejection pipe 10 when the ink ejection stops.
It has been found that there is a problem in that the ink does not adhere well to the rotating ink mixing roller l.

The present invention has been made in view of such problems.

It is an object of the present invention to provide an ink supply nozzle capable of discharging a minute amount of ink from an ink discharge pipe and supplying the same to a rotating roller.

Means for Solving Problem C] The present invention, which has been made to achieve the above object, includes an ink discharge pipe that opens toward a roller to which ink is to be supplied;
Around the ink discharged from the ink discharge tube.

The gist of the present invention is an ink supply nozzle characterized by having an air discharge means for jetting air in a direction parallel to the ink.

[Effect]

In the ink supply nozzle configured as described above, the air discharge means jets air in parallel around the ink discharged from the ink discharge pipe. This air flow prevents the discharged ink from curling into droplets or curving and returning to its original direction, so that the ink discharged from the ink discharge tube advances forward in a long and narrow manner. As a result, the ink is well supplied to a roller such as an ink mixing roller and can adhere to the roller even if the roller is rotating. In this way, a predetermined amount of ink discharged from the ink supply nozzle is supplied to the roller.

〔Example〕

An embodiment of the present invention shown in nine drawings will be described below. Note 2
Although the embodiment shown in the drawings is an application of the present invention to an ink supply device for a proofing machine, the present invention is not limited to this case, but can be applied to ink supply for any other printing machine.

FIG. 2 is a perspective view showing a schematic configuration of an ink supply device for a proofing machine using an ink supply nozzle according to an embodiment of the present invention, and FIG. 3 is a system diagram thereof. In the same figure, 9
1 is an ink mixing roller of the proofing machine, and 2 is an intermediate roller.

The ink supply device is designated as a whole by reference numeral 3.

At a constant pitch along the ink mixing roller l of the proofing machine.

In addition, a plurality of ink supply nozzles 4 arranged toward the ink mixing roller 1, an ink supply pipe 5 connected to each ink supply nozzle 4, and an ink pressure inside the ink supply pipe 5 are kept almost constant. An ink pump 6 that supplies ink so as to drip, each ink supply nozzle 4 and an ink supply pipe 5
The ink valve 7 and the like are arranged between the ink valve 7 and the ink valve 7.

Figure 1 shows each ink supply nozzle 4. 1 is an enlarged sectional view showing an ink valve 7, etc. In this embodiment, the ink supply nozzle 4 is an ink discharge pipe 10 for discharging ink.

It consists of a holding block 11 holding this ink discharge pipe 10, and the holding block 11 has an air discharge hole 12 surrounding the ink discharge pipe IO. This air discharge hole 12 constitutes an air discharge means for jetting air parallel to the ink discharge direction from the ink discharge pipe 10.

The ink discharge tube 1O has the function of helping the ink 15 discharged from the ink discharge tube 10 to be discharged forward in a long and narrow manner as shown in the figure. ) consists of a thin tube that can eject ink into a long and thin tube.

Usually, those with an inner diameter of about 0.5 to 2 cm are used. In addition.

Although the holding block 11 may be provided independently for each ink supply nozzle 4, it is preferable to construct it from one part common to all the ink supply nozzles 4 as in the two illustrated embodiments because the structure is simplified. The pitch of the ink supply nozzles 4 arranged along the ink mixing roller 1, that is, the pitch of the ink discharge pipes 1O, is determined by taking into account the range in which the ink spreads on the ink mixing roller 1 during the ink mixing operation.
~40fi is selected. The tip of the ink discharge tube 10 is not limited to being aligned with the front surface of the holding block 11 as shown in FIG. 1;
Even if the holding block 1 is protruded forward from 1 or slightly
1, but the structure shown in FIG. 1 is preferable because it facilitates the work of cleaning ink stains.

The ink valve 7 is formed with two bodies 16 and this body 16,
and an ink introduction hole 17 connected to the ink supply pipe 5.

Small diameter ink passage hole 18A communicating with ink discharge pipe 10
A cylinder hole 20 is formed near the rear end of the main body 16, which is a needle valve having a needle 19 having a tapered portion 19A at its tip to be inserted into the ink passage hole 18A. an air actuated piston 21 connected to the needle 19 is slidably inserted therein;
Moreover, a coil spring 22 is arranged on the back side thereof. An air supply and exhaust pipe 23 is connected to the cylinder hole 20,
This air supply/discharge pipe 23 is connected to the air supply pipe 2 via a solenoid valve 24.
5 (see Figure 2). Further, the exhaust port of the solenoid valve 24 is connected to the air discharge hole 12 of the holding block 11 by a pipe 26. This magnetic valve 24 switches between an open position where compressed air from the air supply pipe 25 is supplied to the cylinder hole 20 and a closed position where the compressed air from the air supply pipe 25 is cut off and the cylinder hole 20 is exhausted to the pipe 26. Kui 1
belongs to. Thus, opening and closing of the solenoid valve 24 causes the air actuated piston 21 to reciprocate and open and close the needle 19 relative to the valve seat 18.

The air-operated piston 21, the electromagnetic valve 24, and the like constitute operating means for opening and closing the ink valve 7 by turning it on and off.

2 and 3, the ink pump 6 has a piston 31 inserted into an ink can 30 containing ink and an air cylinder 32 that pushes the piston 31 into the ink can 30. The ink in the ink can 30 is pressurized at a constant pressure determined by the driving force of the air cylinder 32, and the ink is supplied into the ink supply pipe 5 at a constant ink pressure.

Note that the ink pump 6 is not limited to this structure, and other types of pumps may be used as long as they can supply ink at a constant pressure into the ink supply pipe 5.

In FIGS. 2 and 3, 35 is a controller, and 36 is a portable switch board, which constitute a control device that controls the opening and closing of the solenoid valve 24. This switch board 36 has a length longer than the width of the proof sheet 37, is placed on a stand for the printed proof sheet 37, and has a plurality of push buttons 38 corresponding to the plurality of ink nozzles 4. are doing. This push button 38 is mounted on the switch board 36 in the same arrangement and at the same spacing as the corresponding ink supply nozzle, and is used to operate the solenoid valve 24 combined with the corresponding ink supply nozzle 4. . Further, the switch board 36 is also provided with an all-operation push button (not shown) for operating all the solenoid valves 24 at the same time. The controller 35 operates the solenoid valve 24 in response to the operation of each push button 38 on the switch board 36, and when the push button 3 is pressed once, the solenoid valve 24 is activated.
It has a control circuit that opens for a short fixed period of time (for example, about 0.5 seconds) and then closes it. Therefore, push button 38
Press once.

The ink valve 7 opens for a certain period of time and then closes, discharging a certain amount of ink. The opening time of the ink valve 7 is determined so as to achieve a desired minimum discharge amount (for example, about 0.01 g). Further, when the controller 35 presses the full operation push button, the controller 35 controls all [magnetic valves 24] in short cycles (for example,
It also has a control circuit that opens and closes a predetermined number of times (about 0.5 seconds).

In FIG. 2, 40 is a solenoid valve for controlling the supply of compressed air to the air supply pipe 25, and 41 is a solenoid valve for controlling compressed air for operating the ink pump 6.

Next, the operation of the ink supply device having the above configuration will be explained.

To start the operation of the calibration machine, first open the solenoid valve 41 to supply compressed air to the ink pump 6, operate the ink pump 6 to supply ink to the ink supply pipe 5, and maintain the pipe internal pressure at a constant pressure (for example, 35 kg/cm). 0 then,
Push buttons for all operations on switch board 36 (not shown)
is pressed, thereby causing all the solenoid valves 24 to open and close a predetermined number of times in a constant cycle. When the solenoid valve 24 opens.

In FIG. 3, compressed air is supplied to the cylinder bore 20, pushing the air-actuated piston 21 downward and causing the needle 1 to move downward.
9 is opened, whereby the high-pressure ink in the ink supply pipe 5 is fed into the ink discharge pipe 10, and is discharged from the tip thereof.Then, when the solenoid valve 24 is closed, the high-pressure ink in the ink supply pipe 5 is fed into the ink discharge pipe 10, and then the solenoid valve 24 is closed.
The compressed air inside is exhausted to the piping 26, and the air pressure acting on the air-operated piston 21 disappears.

The needle 19 is connected to the valve seat 18 by the coil spring 22.
, the valve is closed and ink discharge from the ink supply nozzle 4 is stopped. Here, the needle 19 not only blocks ink discharge, but also functions to push out the ink present in the ink passage hole 18B of the valve seat 1B by the tapered portion 19A at the tip of the needle 19 when the needle 19 is closed.

As a result, the ink is pushed out from the ink discharge tube IO at high speed, and the ink is discharged from the ink discharge tube 10 in a long and narrow manner, and as shown in FIG. 6, the ink is prevented from becoming droplets at the tip of the ink discharge tube 10. Ru. Also.

When the needle 19 closes, the exhaust air from the cylinder hole 20 is discharged from the air discharge hole 12 of the holding block 11.

This air is used to ink 1 discharged from the ink discharge pipe 10.
5 is prevented from bending and sticking to the ink discharge tube 10 as shown in FIG. 5 when ink discharge is stopped, and also prevented from curling into a droplet shape as shown in FIG. 6.

Thus, by opening and closing the solenoid valve 24 once, the needle 19
opens and closes once, and each ink supply nozzle 4 to needle 19
A fixed amount of ink determined by the opening time of the ink is ejected in a long and narrow manner, and is well supplied to the ink mixing roller. As mentioned above, when the push button for all operations is pressed, all the solenoid valves 24 repeat opening and closing a predetermined number of times, so that a predetermined amount of ink is ejected from each ink supply nozzle 4 and uniformly onto the ink mixing roller l. Supplied. After this, the first calibration machine starts normal operation.

Next, while the two calibration machines are operating, the 8
The finished proof print 37 is placed on a stand and the shading in one width direction is visually judged. 5. To make it easier to judge the shading in the width direction, you may print out a color batch (see reference numeral 39 in Figure 3). If there is a light area in two colors as a result of visual inspection, that area can be adjusted accordingly. push button 38 (for example,
Press the push button (■ in Fig. 3), which causes the solenoid valve 24 combined with the ink valve 7 (for example, the ink valve (■)) connected to the ink supply nozzle 4 corresponding to the push button 38 to operate for a predetermined period of time. The ink valve 7 is opened and closed for a predetermined period of time, and a predetermined amount of ink is passed through the ink valve 7 and discharged from the ink supply nozzle 4 to replenish the ink mixing roller 1. When the amount of replenishment is insufficient, by pressing the push button 38 twice or three times, the ink valve 7 opens and closes twice or three times to discharge the desired amount of ink.

In this way, while checking the density unevenness in the width direction of the first proof 37, by simply pressing the push button of the light density part,
Density correction can be easily performed.

In the above embodiment, when the push button 3 on the switch board 36 is pressed once, the solenoid valve 24 opens and closes once for a predetermined time, and therefore the ink valve 7 opens only once for a predetermined time and remains constant. When the push button 38 is pressed once, the solenoid valve 24 opens and closes a predetermined number of times at a predetermined period, and therefore the ink valve 7 opens and closes a predetermined number of times at a predetermined period. It may be configured to discharge a fixed amount of ink, and in the above embodiment, when supplying a large amount of ink, the push button 38 is pressed multiple times to open and close the ink valve multiple times. Instead, while the push button 38 is pressed, 1i! The magnetic valve 24 may be configured to repeat opening and closing at a predetermined period, and the amount of ink discharged may be controlled by adjusting the time period during which the push button 3B is pressed.

Furthermore, when the push button 38 is pressed, the magnetic valve 2
4 may be kept open at all times, and the ink discharge may be continued with the ink valve 7 open.However, if the ink valve 7 is kept open and the ink discharge continues. Then, since the ink pushing effect when the needle 19 of the ink valve 7 is closed cannot be utilized, the ink tends to curl into droplets at the tip of the ink discharge pipe 1O as shown in FIG. 6. To prevent this, the ink It is necessary to increase the internal pressure of the supply pipe or increase the amount of air discharged from the air discharge pipe.

Further, in the above embodiment, the air discharge hole 12 of the ink supply nozzle 4 is configured to supply exhaust air from the cylinder chamber 20 that operates the ink valve 7, but any other air supply source may be used instead. Furthermore, the air supply may be carried out continuously, but since the ink 15 discharged from the ink discharge pipe 10 curves at the moment when the ink discharge stops, air jetting is performed only at this moment. Moreover, since the air ejected from the air ejection holes 12 may dry the ink on the ink mixing roller, it is desirable that the amount of ejected air be as small as possible, and the second embodiment shown in the drawings is preferable from these points. .

Further, in the above embodiment, the operating switch board 36 is portable and placed on the stand for one proof, but the switch board may be placed in the printing section of the proofing machine. In addition, although the above embodiments show manual operations using push buttons while looking at the picture on the proof sheet, a density measuring device capable of measuring the density of a color batch formed on one proof sheet is used. Based on detected values.

It is also possible to automatically control a solenoid valve associated with each ink valve.

In the above embodiment, a large number of ink supply nozzles 4 are arranged along the ink mixing roller 1 at a constant pitch.

Instead of using a large number of ink supply nozzles, a single ink supply nozzle may be provided movably along the ink mixing roller, and after being moved to a desired position, a desired amount of ink may be supplied.

〔Effect of the invention〕

As is clear from the above description, the ink supply nozzle of the present invention has the following features:
Since the device is equipped with an air discharge means that blows air parallel to the ink, the ink discharged from the ink discharge tube does not become elongated and curved due to the air flow around it (it moves forward, and during the two rotations). It has the effect of being able to contact and adhere well to the roller and supplying a small amount of ink.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view showing an ink supply nozzle and an ink valve according to an embodiment of the present invention, and Fig. 2 shows a schematic configuration of an ink supply device for a calibration machine using the above ink supply nozzle and ink valve. A perspective view, FIG. 3 is a system diagram, FIG. 4 is a sectional view showing a modified example of the ink supply nozzle, and FIGS. 5 and 6 are sectional views showing the behavior of ink discharged from the ink discharge pipe. It is. 1-・Ink mixing roller 2-・−・Intermediate roller 3・−
Ink supply device for proofing machine 4 - Ink supply nozzle 5 - Ink supply pipe 6 -
・-Ink pump 7...-Ink valve 10-・
Ink discharge pipe 11 - Holding block 12 - Air discharge hole Representative Patent attorney Kyo Matsu Sanga 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure Fang 6

Claims (1)

[Claims] It is characterized by having an ink discharge pipe that opens toward the roller to which ink is to be supplied, and an air discharge means that jets air around the ink discharged from the ink discharge pipe in a direction parallel to the ink. Ink supply nozzle.