JPS6225265Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gun for applying adhesives and the like.

Guns for dispensing high viscosity fluids such as adhesives are required to have the following performance characteristics: (a) good response, (b) small size and light weight, and (c) no dripping when turned off. In particular, when automating the application of adhesives, etc., it is important to (a) be able to work in narrow spaces and areas with obstacles, and (b) ensure that the weight of the gun does not place a burden on automatic machines, such as robots. In order to meet these requirements, it is necessary to make the coating gun smaller and lighter.

However, conventional coating guns are equipped with a nozzle and a valve that controls the spray from the nozzle, such as a solenoid valve, and solenoid valves require considerable size and weight, so automatic machines do not require a coating gun. When installing
There was a limit to weight reduction. When installing the gun on an automatic machine, the nozzle and valve part are separated, and only the nozzle is attached to the working part of the automatic machine.
It is conceivable to install the valve part in a separate location, but in this case, the gun part of the automatic machine can be made smaller and lighter, but piping will be required between the nozzle and the valve, and the nozzle and valve will be separated. There is a drawback that the response deteriorates due to the separation, and there is also a drawback that harmful sagging occurs.

The present invention eliminates the above drawbacks, has good responsiveness,
Moreover, the object is to provide a coating gun that is small and lightweight.

The present invention has achieved the above objectives by creating a structure in which a valve and a nozzle are integrally formed, and a cam device that operates according to the movement of the gun body that includes the valve and nozzle is used as a driving device for the valve. .

With the present invention, a small and lightweight gun can be obtained without requiring a separate valve part, and since the nozzle and valve are close to each other, a gun with good responsiveness and no dripping can be obtained.

The details of the invention will be explained with reference to embodiments shown in the figures.

In FIGS. 1 and 2, the gun body 1 is
It is supported by a movable link 3 by a joint pin 2 so as to be vertically movable. The movable link 3 is supported by a support member 5 by a support pin 4 so as to be vertically movable. The support member 5 may be an arm of an automatic machine, such as a robot, or may be formed by a link attached to the automatic machine.

A valve chamber 6 is formed in the gun body 1, and the valve chamber 6 is connected to a coating material supply tank (not shown) via a joint 7 fixed to the gun body 1 and a coating material supply tube 8 connected to the joint 7. ) is connected. A valve seat 9 is attached to the valve chamber 6, and a needle valve body 10 is attached so as to be seated on the valve seat 9. The needle valve body is connected to the gun body 1.
extending along the axis of the gun body 1 and penetrating the gun body 1;
It is slidably supported by the gun body 1. A roller 11 is rotatably supported at the tip of the stem portion of the needle valve body 10 as a cam follower. Ball bearings can also be used instead of the rollers 11.

A lid portion 11 is fixed to the gun body 1 to seal the valve chamber 6. In this case, the valve seat 9 can also serve as a packing function. A spring chamber 12 is formed in the lid portion 11 and a spring 13 is housed therein. The spring 13 is connected to the needle valve body 10 and the lid portion 11.
The needle valve body 10 is stretched between the needle valve body 10 and the valve seat 9.

The valve chamber 6 is connected to the lid member 11 via the spring chamber 12.
A nozzle hole 11a communicating with is formed.

A nozzle 14 is fixed to the lid member 11, and the hollow hole 15 of the nozzle 14 is connected to the nozzle hole 11a of the lid member 11.
communicate with. If necessary, the nozzle 14 and the lid member 11 may be formed integrally.

A roller 11 attached to the free end of the stem portion of the needle valve body 10, which is pressed against the valve seat 9 by the spring 13, is in contact with a cam 16 formed or attached to the movable link 3. The cam 1 changes depending on the relative rotation between the movable link 3 and the gun body 1.
The relative position of roller 6 and roller 11 changes, and roller 11 becomes cam 1.
6 to open and close between the valve chamber 6 and the spring chamber 12.

The cam 16 most simply has a small-diameter arcuate surface 16a in a predetermined angle range α, and while the roller 11 is in contact with the small-diameter arcuate surface 16a, the needle valve body 10 is in contact with the valve seat 9, and the valve seat 9 is in contact with the valve seat 9. room 6
Seal it tightly. The remaining range of the cam 16 is formed as a large-diameter arcuate surface 16b, and when the roller 11 moves so as to come into contact with the large-diameter arcuate surface 16b, the needle valve body 10 is moved and the valve chamber 6 is opened. 1st
The figure shows a state in which the needle valve body 10 closes the valve chamber 6, and FIG. 3 shows a state in which the needle valve body 10 opens the valve chamber 6.

A first joint spring 17 is attached to the first joint pin 2, and the first joint spring 17 is formed so as to give the gun body 1 a clockwise rotational habit relative to the link 3 in FIG. . Similarly, support pin 4
A second joint spring 18 is attached to the second joint spring 18, and the second joint spring 18 is formed so as to give the movable link 3 a counterclockwise rotational habit relative to the support member 5 in FIG.

The gun body 1 is formed with respect to the movable link 3, and the movable link 3 is formed with respect to the support member 5 so that it does not rotate in the direction of rotation by the respective joint springs 17 and 18 from the state shown in FIG. For example, as shown in FIGS. 4 and 5, a pin 20 is embedded in the movable link 3 in an arcuate groove 19 formed in the gun body 1.
The movable link 3 of the gun body 1
The relative rotation range is limited. Conversely, an arcuate groove may be formed in the movable link 3 and a pin may be formed in the gun body 1. Further, by forming stopper surfaces 5a and 5b on the support member 5, with which a portion of the movable link 3 comes into contact, the range of rotation of the movable link 3 can be limited.
In this case as well, the stopper surface may be provided on the movable link 3.

With the above structure, the gun body 1 is supported by the support member 5 with the nozzle 14 extending diagonally with respect to the horizontal plane.

The operation of the gun of this device will be explained with reference to FIG.

From the standby state shown at A in FIG. 6, it is lowered downward in the figure toward the coating surface. In the case of coating on a vertical surface, it is the same if the drawing of FIG. 6 is rotated by 90 degrees, so the work on a horizontal surface will be explained below as a representative.

When the tip of the nozzle 14 contacts the application surface 21, relative rotation occurs between the gun body 1 and the movable link 3 and between the movable link 3 and the support member 5, and the gun body 1 is rotated by a predetermined angle with respect to the movable link 3. When it rotates, the state shown by the solid line in FIG. 3 is reached, and the roller 11, which is a cam follower, is pushed up, and the needle valve body 10 is separated from the valve seat to open the valve chamber 6, so that the coating agent is applied to the coating surface 21 by the nozzle 14. Ru.

In this state, the nozzle 14
Continue application while moving to position C in the figure.

While the support member 5 is rising from position C to position D, the joint springs 17 and 18 apply a rotational force to return the gun body 1 and movable link 3 to their original states. At this time, when the gun body 1 returns to a predetermined relative angular position with respect to the movable link 3, the roller 11 moves to the first position.
As shown in the figure, it returns to the state in which it contacts the cam surface 16a, the valve chamber 6 is closed, and the coating is completed. At the time when coating is finished, the nozzle 14 is still on the coating surface 2.
1, the nozzle 14 separates from the coating surface 21 at the same time as or slightly after the completion of coating.

In order to reliably monitor the start and end of the coating operation, a micro switch 22 is fixed to the movable link 3 or the gun body 1 as shown in FIG. 2
3, the position at which the needle valve body 10 switches to the open or closed position can be detected from the relative movement of the gun body 1.

If the cam 16 is configured to open the valve chamber 6 as soon as the nozzle 15 rotates even slightly from its initial position, the nozzle 14 will open immediately after it comes into contact with the application member, and conversely, it will open immediately after the nozzle 14 comes into contact with the application member, or vice versa. Valve chamber 6 can be closed.

Although the movable link 3 can be omitted and the support member 5 can be used directly instead of the movable link 3, it is better to provide the movable link 3 because it allows the movable link to act as a cushion and prevents the nozzle or the coating surface from being forced. This is advantageous because it avoids deformation caused by applying force.

It is also possible to use an actuating rod that protrudes from the nozzle to control the opening and closing movement of the needle valve element, and utilize the movement of the actuating rod as it comes into contact with the coating surface and is pressed, and the needle valve element is moved by the movement of the actuating rod. Since the force necessary to operate the needle valve body is applied to the coating surface, there is a possibility that the coating surface and the needle valve body may be deformed. On the other hand, if a cam is used as in the embodiment shown in the figure, an amplified force will be applied to the needle valve body due to the movement of the gun body due to a slight force, and there is a risk of deformation of various parts. do not have.

With this invention, the valve and nozzle can be made compact, and since the drive source is a cam device that is activated by the movement of the gun body, there is no need to provide a particularly heavy drive device, making it possible to achieve a reduction in size and weight. Moreover, since the valve and nozzle are almost integrated, the opening and closing operation of the valve immediately turns on and off the application by the nozzle, resulting in very good responsiveness. Also, since there is very little amount of coating material present from the valve to the tip of the nozzle, there is no dripping of the coating material.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a partial cross section of the gun according to the present invention, Fig. 2 is a side view, Fig. 3 is a view corresponding to Fig. 1 showing the state when the valve is open, and Fig. 4 shows the gun body and An explanatory diagram of the means for limiting the movement of the movable link, FIG. 5 is a V arrow diagram of FIG. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 1... Gun body, 3... Movable link, 5... Support member, 6... Valve chamber, 10... Needle valve body, 11... Cam follower (roller), 13... Spring, 14... Nozzle, 16 ...Cam, 17, 18
... Joint spring, 21 ... Application surface.

Claims (1)

[Scope of utility model registration request] a movable link rotatably supported at one end by a support member; a gun body rotatably supported at one end by the other end of the movable link; The gun body has an articulation spring that applies a return force to the support member and the movable link to a preset angular position, a cam that is directly or indirectly attached to the movable link, and a cam follower that contacts the cam. and a needle valve element that is slidably supported by the gun body and opens and closes a valve chamber formed within the gun body, and a nozzle that is provided at the tip of the gun body and is formed so as to be able to communicate with the valve chamber. . A gun for adhesive application, characterized in that a coating material is supplied to the valve chamber, and the valve chamber is opened and closed by relative rotation between the gun body and the movable link due to contact with the application surface of the tip of the nozzle.