JPS6020447Y2 - adhesive applicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an adhesive applicator that is particularly suitable for applying an adhesive onto a moving object.

FIG. 1 is a sectional view showing a conventional adhesive application device, showing a state in which adhesive for edge adhesion is applied onto the periphery of a speaker cone paper.

In the figure, A is a cylinder, and an adhesive discharge port B is provided at the lower end of the cylinder A, and an adhesive introduction port C is formed in the side wall near the discharge port B.

D is a piston, and the piston D is urged upward by a spring E.

A valve shaft F is fixed to this piston D, and the valve shaft F
A valve body H that can move toward and away from the valve seat G is formed at the tip of the piston D, and the valve body H is set to move away from the valve seat G when the piston D descends.

I is an O-ring.

An air inlet J is formed at the top of the cylinder A, and the inlet J is connected to an air tank L via a three-way valve K.
is connected to.

M is a cone paper for a speaker, and the cone paper M is placed on a rotary table N, and is arranged so that the periphery of the cone paper M is located directly below the ejection port B.

Therefore, when the cone paper M is rotated at a constant speed and the rotary valve of the three-way valve is set to the state shown in the figure, the air in the air tank L is introduced into the cylinder A through the three-way valve K, and this air As a result, the piston D moves downward against the elastic force of the spring E, and the valve body H separates from the valve seat G, creating a gap therebetween.

Therefore, the adhesive introduced into the cylinder A from the introduction port C through this gap is discharged from the discharge port B in accordance with the amount of descent of the piston D.

The discharged adhesive O is applied linearly along the periphery of the rotating paper cone M, as shown in FIG.

Also, when the rotary valve in the three-way valve is rotated 90 degrees clockwise from the state shown in the figure, the air supply from the air tank L to the cylinder A is cut off, and the air in the cylinder A flows backwards to the three-way valve. It is exhausted to the atmosphere through the exhaust port 2 to the valve.

Therefore, the piston D in the cylinder A is returned upward by the spring E, so that the gap between the valve body H and the valve seat 0 is closed, and the discharge of adhesive from the discharge port B is stopped.

However, in the conventional adhesive applicator described above, the fourth
As shown by the chain line in the figure, the pressure of air in the cylinder A increases rapidly and is applied to the piston D at the same time as the coating operation starts, so that the adhesive remaining at the discharge port B is removed. A large amount is dispensed instantly.

Therefore, as shown in FIG. 2, a large amount of adhesive adheres to the starting end 01 of the adhesive 0 applied on the periphery of the cone paper M so as not to drip.

Furthermore, at the end of the application work, the air remaining in the cylinder A is not rapidly exhausted to the atmosphere, so the return movement of the piston D is delayed, and therefore, even after the work is completed, a small amount of adhesive remains from the discharge port B. It is discharged.

That is, there was a drawback that the adhesive was not easily discharged at the end of the work.

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides an adhesive applicator that can uniformly apply adhesive to a moving object from the starting end, and also has good edge cutting. The purpose is to

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Fig. 3 is a sectional view showing an adhesive applicator according to the present invention. In the figure, 1 is a cylinder, and the lower end of the cylinder 1 is provided with adhesive A discharge port 2 is opened, and an introduction port 3 for introducing adhesive into the cylinder A is formed in the side wall near the discharge port 2.

A piston 4 moves up and down within the cylinder 1, and the piston 4 is urged upward by a spring 5.

An upper end of a valve shaft 6 is fixed to the piston 4, and a valve body 8 that can freely move toward and away from a valve seat 7 is formed at the lower end of the valve shaft 6.

The valve body 8 is set so as to separate from the valve seat 7 when the piston 4 descends, and 9 is a valve chamber.

An air inlet 10 is formed at the top of the cylinder 1;
An air tank 13 is connected to this inlet 10 from an auxiliary tank 11 via a three-way valve 12.

In this case, the air tank 13 can generate air at a predetermined pressure, but the auxiliary tank 11 simply stores air.

12a is a rotary valve of the three-way valve 12, and 12b is an air exhaust port.

Next, the operation of the above embodiment will be explained.

The object to be coated with the adhesive is cone paper M, as in the conventional example shown in FIG. 1, and the adhesive is applied onto its periphery, but this is omitted in the drawing of FIG. 3. .

First, to explain the coating operation, when the cone paper M is rotated at a predetermined speed and the rotary valve 12a of the three-way valve 12 is switched to the state shown in FIG. After passing through the valve 12 and being depressurized in the auxiliary tank 11, it is supplied into the cylinder 1.

When the depressurized air is supplied into the cylinder 1, the piston 4 slowly descends against the spring 5, and the gap between the valve body 8 and the valve seat 7 gradually widens over a predetermined period of time. Afterwards, the air pressure in the air tank 13 and in the auxiliary tank 11 become the same pressure, so the piston 4 descends at a constant speed.

Then, the adhesive introduced into the cylinder 1 from the introduction port 3 passes through the gap between the valve seat 7 and the valve body 8 and is discharged from the discharge port 2 onto the periphery of the paper cone M.

Therefore, as shown by the solid line in FIG. 4, the piston 4 slowly descends from the starting point until a certain time, and then descends at a constant speed, so the amount of adhesive discharged from the discharge port 2 is: Start with a small amount and then a fixed amount.

As a result, as shown in FIG. 2, at the starting end 01 of the linear adhesive O applied on the periphery of the cone paper M, the inconvenience of a large amount of adhesive being applied as if it were dripping can be prevented. be able to.

Next, when the rotary valve 12a of the three-way valve 12 is rotated 90° clockwise, the air supply from the air tank 13 to the cylinder 1 is cut off, and the residual air in the cylinder 1 and the auxiliary tank 11 is released by the spring. Due to the rising of the piston 4 due to the restoring force of
2b is emitted to the atmosphere.

On the other hand, since the valve body 8 comes into contact with the valve seat 7 and the gap between them closes, the discharge of the adhesive from the discharge port 2 is stopped.

A three-way valve 14 is inserted between the inlet 10 of the cylinder 1 and the auxiliary tank 11 as shown by the chain line in FIG. The valve 12a may be configured to rotate synchronously with the valve 12a.

When the three-way valve 14 is inserted in this way, both rotational positions 12a and 14a are rotated 90 degrees clockwise when the adhesive application is completed.
'When the cylinder 1 rotates, the air remaining in the cylinder 1 is rapidly discharged from the exhaust port 14b of the three-way valve 14, so the rising speed of the piston 4 is quick, and the adhesive discharged from the discharge port 2 is used for coating. It has the advantage of being able to stop at the same time as it ends.

The present invention includes a cylinder 1 and the cylinder 1 as described above.
a piston 4 that is movable therein; a spring 5 that urges the piston 4 upward; an upper chamber and a lower chamber formed by the piston 4; an inlet 3 that introduces adhesive into the lower chamber; A discharge port 2 for discharging the adhesive introduced into the lower chamber to the outside; a royal opening/closing means for controlling discharge of the adhesive from the discharge port 2 formed at one end of the piston 4; an air tank 13 that supplies air into the cylinder 1 for lowering; a three-way valve 12 interposed between the air tank 13 and the cylinder 1;
It consists of an auxiliary tank 11 inserted in series between the three-way valve 12 and the cylinder 1.

Therefore, air at a predetermined pressure that is sent out from the air tank 13 at the same time as the start of the coating work is reduced in pressure in the auxiliary tank 11 and then supplied into the cylinder 1 to lower the piston 4, so that the piston 4 is The pressure drops slowly until a predetermined time elapses, so that a large amount of the adhesive remaining in the vicinity of the discharge port 2 is not forced out at the same time as discharge starts.

Therefore, for example, when rotating a cone paper at a constant speed and applying adhesive along its edges or along the adhesive part of the damper, there is an inconvenience that a large amount of adhesive adheres to the starting edge of the cone paper as if dripping. is prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional adhesive applicator and a paper cone rotation device used to apply adhesive using the same device, and Fig. 2 is a part of a cone paper coated with adhesive by the same adhesive applicator. The front view and FIG. 3 are cross-sectional views of the adhesive applicator according to the present invention, and FIG. 4 is a diagram showing the relationship between cylinder internal pressure and time in the same device. 1...Cylinder, 2...Discharge port, 4...
... Piston, 5 ... Spring, 8.
... Valve seat, 11 ... Auxiliary tank, 12.
...Three-way valve, 13...Air tank.

Claims (1)

[Scope of utility model registration request] a cylinder; a piston movable within the cylinder;
a spring that biases the piston upward; an upper chamber and a lower chamber formed by the piston; an inlet for introducing adhesive into the lower chamber; and an outlet for discharging the adhesive introduced into the lower chamber to the outside. a lower chamber opening/closing means for controlling discharge of the adhesive from the discharge port formed at one end of the piston; an air tank for supplying air into the cylinder to lower the piston; An adhesive application device comprising: a three-way valve interposed between a tank and a cylinder; and an auxiliary tank inserted in series between the three-way valve and the cylinder.