JPH0314103B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an intake/exhaust/neutral switching valve device, and is used to control various types of air pressure in machine tools, printing presses, and other various equipment by controlling intake, exhaust, and neutral air pressure. When operating, the air pressure can be easily switched and controlled. For example, when setting, printing, and ejecting the printing material in conjunction with the back and forth movement of the printing table in a screen printing machine, air pressure is used to set, print, and discharge the printing material. This invention relates to an intake/exhaust/neutral switching valve device suitable for

[Technical Background of the Invention and Problems Therewith] Conventionally, as shown in FIGS. 6 to 8, in a screen printing machine, a screen printing machine 101, which is supported and set to move up and down within the main body of the printing machine, is The printing table 102 has a basic configuration in which a printing table 102 to which a discharge belt 106 is connected is moved back and forth, and the printing table 102 has an air intake/exhaust mechanism on its upper surface for the printing material 100 that is set, printed, and discharged. An air hose 103 is connected to the lower part of the print table 102, and air intake and exhaust is performed through a large number of small diameter air intake and exhaust holes drilled in the printing table 102. That is, as shown in FIG. 6, when the printing material 100 is set on the printing table 102 which has been removed from the printing press main body, air is exhausted (supplied) from an air source (not shown) through the air hose 103. Positioning of the printing medium 100 is performed in the state where Next, just before the printing table 102 is moved forward toward the lowered screen printing plate 101 toward the main body of the printing press, the air flow is reversed by electrically controlled valve switching to change the air flow from exhaust to intake (exhaust). After that, the printing table 102 is moved forward. Then, as shown in FIG. 7, the squeegee 104 running on the screen printing plate 101 presses against it and rubs against it, thereby performing predetermined printing on the printing material 100. At this time, the air is in an intake state. It is becoming. After printing is completed, as shown in FIG. 8, the screen printing plate 101 rises, and at the same time, the air flow is changed from intake to exhaust to raise the printing material 100 from the upper surface of the printing table 102, and at the same time, the gripper 105 is the printing material 100
Grasp the edge. In this way, gripper 1
05 grips the printing material 100, the printing table 102 moves backward to the outside of the printing press body, and the gripper 105 grips the discharge belt 106 which is pulled out below the screen printing plate 101. The printing material 100 released from the holder falls. Next, when the printing table 102 on which the next printing material 100 is set moves forward again, the printing material 100 on the discharge belt 106 is accumulated at a predetermined stock location.

Therefore, in the conventional screen printing machine as described above, the air flow to the printing table 102 has two positions: exhaust (supply) and intake (discharge), and the strength can be adjusted. It is configured so that. Therefore, as shown in FIG.
When setting the print material 100 above, if the printing material 100 is thin and lightweight like a film, the air flow above the printing table 102 is in an exhaust state, so the printing material 100 floats up, making it difficult to position it. In order to solve this problem, air exhaust is kept small and weak. In addition, when a film, vinyl resin, etc. is printed, very strong static electricity is generated by the screen printing plate 101 and the squeegee 104, and it comes into close contact with the surface of the printing table 102. Even if the printing material 100 is gripped, if the adhesion force due to static electricity is strong, it may remain on the printing table 102 without being ejected. For this reason, although it is sufficient to make the air exhaust large and strong at the time of discharging, the problem arises that the air exhaust becomes large even when the printing medium 100 is set, making it extremely difficult to position it.

[Object of the Invention] Therefore, the present invention was created in view of the conventional drawbacks as described above, and its main purpose is to:
When setting the printing material on the printing table in a screen printing machine, it is set in a neutral state with no suction or exhaust, which facilitates the setting work.During printing, the suction state prevents misalignment, and when discharging, the gripper is placed in the exhaust state. The purpose is to provide a valve device that contributes to automation in a series of printing processes by ensuring reliable gripping and ejection.
An object of the present invention is to provide a versatile valve device that can be used not only for screen printing machines but also for machine tools and other machines that perform a series of operations by controlling air intake and exhaust.

[Summary of the Invention] Therefore, in the present invention, an exhaust port that communicates with the exhaust side of the air source and an intake port that also communicates with the air source are arranged opposite to each other, and a neutral port for releasing outside air, The valve body has suction and exhaust ports that communicate with each other facing each other, and a valve plate is fixed to a rotatably internally supported valve shaft. A first rotary solenoid is linked together and attached to the valve body, and a second rotary solenoid is also coaxially linked to the other end of the valve shaft and is set to have a swing range that is approximately 1/2 that of the first rotary solenoid. When both the first rotary solenoid and the second rotary solenoid are OFF, the exhaust port and suction/exhaust port are communicated to exhaust the air to the equipment.
When the first rotary solenoid is ON and the second rotary solenoid is OFF, the suction/exhaust port and intake port are communicated to allow the equipment to take in air without any problem, and when the first rotary solenoid is OFF and the second rotary solenoid is ON, it is neutral. The device is characterized in that the valve plate is controlled to swing so that the mouth, suction and exhaust ports are communicated with each other, and the equipment is brought to a neutral position.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

Reference numeral 1 shown in the figure is a valve body 1 having a valve plate 2 for switching air flow to control air intake, exhaust, and neutrality to a printing table in a predetermined device, such as a screen printing machine, and the switching is , by the ON/OFF excitation operation of the first rotary solenoid 20 and the second rotary solenoid 30, which are arranged to swing the valve shaft 3 to which the valve plate 2 disposed inside the valve body 1 is fixed. It will be done.

The valve body 1 itself has an exhaust port 4, which communicates with the exhaust of an air source A such as a blower motor, and an intake port 5, which also communicates with the intake, arranged opposite to each other on a frame wall having a circular cross-sectional shape. In addition, a neutral opening 6 for opening to the outside air and a suction/exhaust opening 7 communicating with the equipment are arranged opposite to each other, and inside, an upper plate 8 and a lower plate 9 provided above and below are preferably sealed. It rotatably supports a valve shaft 3, and a valve plate 2 having a linear shape when viewed from above is fixed to the valve shaft 3. The exhaust port 4, the intake port 5, the neutral port 6, and the suction/exhaust port 7 are arranged at equal intervals on all sides, and when the valve plate 2 is swung inside the valve body 1, the exhaust port 4 and the neutral port 6 are mutually disposed. and an intake (printing) mode device (see FIG. 3) that partitions the inside of the valve body 1 so that the intake ports 5 and 7 communicate with each other. Neutral port 6, suction/exhaust port 7
The exhaust port 4 and the intake/exhaust port 7 are placed in the neutral (alignment) mode position (see Fig. 4) along the mutual axes.
In addition, the valve body 1 is controlled to be in an exhaust (discharge) mode position (see FIG. 5) which partitions the inside of the valve body 1, which allows the intake port 5 and the neutral port 6 to communicate with each other.

These control operations are performed by the first rotary solenoid 20 attached to the outside of the valve body 1, for example, the outside of the upper plate 8, and the second rotary solenoid 3 attached to the outside of the lower plate 9, as described above.
0, and the first rotary solenoid 2
0, the second rotary solenoid 30 is arranged coaxially with the valve shaft 3.

First rotary solenoid 20 as shown
is installed in the body of a valve stay 10 having a substantially hat-shaped cross section for attaching the device of the present invention to a predetermined device, and specifically, is supported by a lower solenoid base 11 fixed to the upper wall of the body. By doing so, the valve stay 10 is installed in the body of the valve stay 10. The first solenoid shaft 21 of the first rotary solenoid 20 is coupled with the lower end of the valve shaft 3 protruding from the lower plate 9 in a coupling chamber 22 defined between the lower solenoid base 11 and the lower plate 9. 23. The first solenoid shaft 21 of the first rotary solenoid 20 is assumed to stop the valve plate 2 at the intake mode position shown in FIG. 3 when the first rotary solenoid 20 is OFF and not energized. When the excitation is ON, the valve plate 2 is oscillated to the exhaust mode position shown in FIG. 5, and the oscillation range is, for example, about 45 degrees.

On the other hand, as shown in the figure, the second rotary solenoid 30 is mounted on the upper wall of a swing linkage mechanism chamber 33 that is defined by an upper solenoid base 32 that is framed in a box shape on the upper plate 8. It is attached by sticking. The second rotary solenoid 30 is set to approximately half the swing range of the first rotary solenoid 20, and the rotational force of the second rotary solenoid 30 is applied to the swing linkage mechanism chamber 33. The valve shaft 3 is rotated via a swing linkage mechanism 34 formed therein.

The swing linkage mechanism 34 is interposed between the second solenoid shaft 31 of the second rotary solenoid 30 and the upper end of the valve shaft 3 protruding from the upper plate 8, as shown in FIGS. 1 and 2. , a stopper 37 is provided at the free end of a solenoid arm 35 fixed to the end of the second solenoid shaft 31, and the stopper 37 is brought into contact with a valve arm 39 fixed to the end of the valve shaft 3. The solenoid arm 35 is fixed to the second solenoid shaft 31 by sandwiching the second solenoid shaft 31 between the bifurcated base ends of the solenoid arm 35, and inserting the fixing screw 36 inserted into one of the base ends into the other. The stopper 37 is formed into a cylindrical shape, and by screwing the stopper bolt 38 inserted through the stopper bolt 38 to the free end of the solenoid arm 35, the stopper 37 itself is rotated. be taken as a thing. Further, the contact between the stopper 37 and the valve arm 39 is achieved by cutting out the contact portion of the valve arm 39 into a stepped portion, and causing the stopper 37 to contact the stepped portion as the solenoid arm 35 swings. The rotation of the stopper 37 itself is taken into consideration so that the transmission of the swing motion to the valve arm 39 is extremely smooth.

The swinging linkage mechanism 34 configured in this manner is connected to the valve shaft 3 and the second rotary solenoid 30.
Since the second rotary solenoid 30 is set to approximately 1/2 of the swing range of the first rotary solenoid 20, the swing force when the first rotary solenoid 20 turns on Therefore, when the valve plate 2 is swung through the valve shaft 3, it separates from the valve arm 39 and solenoid arm 35 fixed to the end of the valve shaft 3, so that the first rotary solenoid 20
The swinging force does not exert an excessive load or influence on the second rotary solenoid 30, thereby extending the life of the second rotary solenoid 30 and improving the reliability of the device itself.

The second solenoid shaft 31 of the second rotary solenoid 30 is moved via the swing linkage mechanism 34 to the intake mode position shown in FIG. It is assumed that no rocking force is transmitted to the valve plate 2 of the valve plate 2, and the valve plate 2 is operated by excitation.
When ON, the valve plate 2 is swung at 1/2 of the swiveling angle of the first rotary solenoid 20 to reach the neutral mode position shown in FIG. 4, and the swiveling range is, for example, about 22 degrees. It is said to be 30′. Further, as shown in the figure, the valve plate 2 and the valve arm 39 are connected to the valve shaft 3.
The valve plate 2 and the valve arm 39 are aligned in the axial direction to facilitate the alignment of the valve plate 2 and the valve arm 39 to the valve shaft 3.

This then controls the operation, setting the substrate on the printing table in the screen printing machine, printing,
The case where discharge is performed will be explained. First of all,
When setting the printing material on the printing table, the first rotary solenoid 20 is turned off and the second rotary solenoid 30 is turned on to put the valve plate 2 in the neutral mode position (see Fig. 4), and then, The air flow exhausted and supplied from the air source A does not reach the printing table 102 via the air intake/discharge port 7 because the exhaust port 4, the intake port 5, the neutral port 6, and the suction/discharge port 7 are in communication with each other. There is no air intake or exhaust, making it easy to align the printing material on the printing table. Next, when the printing table is moved forward to the printing position below the screen printing plate, both the first rotary solenoid 20 and the second rotary solenoid 30 are activated.
By being turned OFF, the valve plate 2 is placed in the intake mode position (see Figure 3), and then,
The valve plate 2 partitions the inside of the valve body 1 so that the exhaust port 4 and the neutral port 6 communicate with each other, and the intake port 5 and the intake/exhaust port 7 communicate with each other. The air is discharged to the outside air through the port 6, while the air is supplied to the air source A through the intake/discharge port 7 and the intake port 5.
The air above the printing table is sucked through, and the substrate on the printing table is brought into close contact with the printing table.
No misalignment occurs when the printing table runs and prints. Furthermore, when printing is completed, the first rotary solenoid 20 is turned ON and the second rotary solenoid 30 is turned OFF to put the valve plate 2 in the exhaust mode position (the fifth
(see figure), then the exhaust port 4 and the suction/discharge port 7 are connected,
In addition, the valve plate 2 partitions the inside of the valve body 1 so that the intake port 5 and the neutral port 6 communicate with each other, and the air flow exhausted and supplied from the air source A passes through the exhaust port 4 and the intake/discharge port 7 as an exhaust flow to the printing table. At the same time, outside air is sucked into the air source A through the neutral port 6 and the intake port 5, and the printing material floats on the printing table. In this state, the printing material is gripped by a gripper, and then the printing material is This is where the ejection process for printed matter is carried out.

[Effects of the Invention] Therefore, for example, when setting, printing, and discharging a printing material on a printing table in a screen printing machine, the position of the printing material can be adjusted by keeping the printing material in a neutral state where no air is sucked or discharged during setting. It makes alignment easier, and when printing, air is taken in, so the printing material comes into close contact with the printing table to prevent its positioning, ensuring accurate printing, and when discharging, air is discharged. to lift the printed material on the printing table, and even if static electricity is generated during printing, the printed material is separated from the top surface of the printing table against this static electricity, ensuring that the gripper can grip and eject the printed material. It is.

That is, an exhaust port 4 that communicates with the exhaust side of the air source A and an intake port 5 that also communicates intake air are arranged opposite to each other, and a neutral port 6 that opens to outside air communicates with a predetermined device. A valve body 1 in which suction and discharge ports 7 are arranged opposite to each other and a valve plate 2 is fixed to a rotatably supported valve shaft 3 is connected to an air source A such as a blower motor and an air suction and discharge device such as a screen printing machine. The valve body 1 is interposed between the valve body 1 and a predetermined device operated by the valve body 1, and is operated by a combination of ON and OFF operations of the first rotary solenoid 20 and second rotary solenoid 30 attached to the valve body 1 By controlling the swinging stop position of the internal valve plate 2, it is possible to supply air to a given device, exhaust air from the device, and even switch to neutral with a single device. be.

In addition, a first rotary solenoid 20 and a second rotary solenoid 30, which swing the valve plate 2 which is pivoted inside the valve body 1, are both coaxially connected to one end and the other end of the valve shaft 3 and connected to the valve body 1. Since it is attached, the overall structure can be made smaller, and even when the air flow is large, it operates reliably and has extremely high reliability.

The first rotary solenoid 20, and this and 1/
Due to the excitation operation for each of the second rotary solenoids 30 set in the swing range of 2.
The valve plate 2 is stopped from swinging by a combination of ON and OFF, and when both the first rotary solenoid 20 and the second rotary solenoid 30 are OFF, the exhaust port 4 and the suction/discharge port 7 are communicated with each other. When the equipment is vented, and the first rotary solenoid 20 is ON and the second rotary solenoid 30 is OFF, the intake/exhaust port 7 and the intake port 5 are communicated to allow the equipment to take in air, and the first rotary solenoid 20 is OFF. When the second rotary solenoid 30 is ON, the valve plate 2 is controlled to swing so that the neutral port 6 and the suction/discharge port 7 are communicated with each other to bring the equipment to neutral. It is reliably stopped at a predetermined swing angle position within the valve body 1, and the air circulation flow of the air source A is switched through the valve body 1 to ensure supply, discharge, and neutral operation.

As explained above, according to the present invention, when performing various control operations based on intake, exhaust, and neutral air pressure in machine tools, printing presses, and other various equipment, it is possible to easily switch and control the air pressure. For example, it is suitable for setting, printing, and discharging the printing material using pneumatic pressure in connection with the back and forth movement of the printing table in a screen printing machine, and its operation is reliable and reliable. It has excellent effects such as high efficiency and versatility.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a sectional view, Figure 2 is a partially cutaway plan view, and Figure 3 is a partially cutaway plan view.
The figure is a sectional view taken along the line - in Fig. 1 in the intake state, and Fig. 4 is the - in Fig. 1 in the neutral state.
FIG. 5 is a cross-sectional view taken along the - line in FIG. 1 in an exhaust state, and FIGS. 6 to 8 explain the setting, printing, and ejection of the printing material in the screen printing machine. FIG. 6 is a side view when setting, FIG. 7 is a side view when printing, and FIG. 8 is a side view when discharging. 100...Printing material, 101...Screen printing plate, 102...Printing table, 103...Air hose, 104...Squeegee, 105...Gripper, 106...Discharge belt, A...Air source, 1
... Valve body, 2... Valve plate, 3...
... Valve shaft, 4 ... Exhaust port, 5 ... Intake port, 6 ... Neutral port, 7 ... Suction and exhaust port, 8 ... Upper plate, 9 ... Lower plate, 10 ... Valve stay, 11 ... Lower part Solenoid base, 20...
First rotary solenoid, 21... First solenoid shaft, 22... Coupling chamber, 23...
...Coupling, 30...Second rotary solenoid, 31...Second solenoid shaft, 32
... Upper solenoid base, 33 ... Swing linkage mechanism chamber, 34 ... Swing linkage mechanism, 35 ... Solenoid arm, 36 ... Fixing screw, 37 ... Stopper, 38 ... Stopper bolt, 39 ... Valve arm .

Claims (1)

[Scope of Claims] 1. An exhaust port that communicates with the exhaust side of the air source and an intake port that also communicates with the air source are arranged opposite to each other,
In addition, a neutral opening for opening to outside air and an intake/exhaust port communicating with a predetermined device are arranged to face each other, and the valve body has a valve plate fixed to a rotatably supported valve shaft internally, and the valve plate swings. The first rotary solenoid is coaxially connected to one end of the valve shaft and attached to the valve body, and the first rotary solenoid is also coaxially connected to the other end of the valve shaft and is set to have approximately 1/2 the swing range of the first rotary solenoid. The first rotary solenoid and the second rotary solenoid are both
When it is OFF, the exhaust port and suction/discharge port are communicated to exhaust air to the equipment, and the first rotary solenoid is turned off.
ON, when the second rotary solenoid is OFF, the suction/exhaust port and intake port are communicated to allow the device to take in air, and the first rotary solenoid is OFF, and the second rotary solenoid is OFF.
When the rotary solenoid is ON, the neutral port
An intake/exhaust/neutral switching valve device, characterized in that a valve plate is controlled to swing so that the intake/exhaust ports are communicated and the equipment is placed in neutral. 2. A swing linkage mechanism is interposed between the other end of the valve shaft and the second rotary solenoid, and the swing linkage mechanism is connected to the free end of the solenoid arm fixed to the second solenoid shaft end of the second rotary solenoid. The suction valve according to claim 1 is provided with a stopper on the valve shaft end, and the stopper is in contact with a valve arm fixed to the end of the valve shaft.
Exhaust and neutral switching valve device.