JPH0597127A - Glue applicator - Google Patents

Abstract

(57) [Summary] [Object] To provide a spray nozzle type glue applying device capable of surely spraying the last part of the glue sprayed from the nozzle to the material to be applied. A nozzle opening 22, a valve seat 9 provided upstream of the nozzle opening 22 with respect to the flow direction of the glue, a valve body 5 that opens and closes relative to the valve seat 9, and a valve that drives the valve body 5 to open and close. A glue applicator having a driving means and spraying glue from the nozzle opening 22. The outer peripheral surface of the valve body 5 is an inclined surface having a shape that narrows toward the nozzle opening 22. The valve seat 9 has an inclined surface that makes surface contact with the outer peripheral surface of the valve body 5. The valve driving means includes a mover 4 which is integral with the valve body 5,
It is composed of a coil 6 and a spring 8 that electromagnetically drive the mover 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glue applicator for applying glue to the margin of material for box making, bag making and the like. In particular,
The present invention relates to a glue applicator that sprays glue from a nozzle opening and applies the glue to a material.

[0002]

2. Description of the Related Art As a method for making a box, a bag, etc., a method of applying a glue to a glue allowance provided in advance on a material and forming the material into a box shape or a bag shape by the glue has been conventionally used. Widely known.

Conventionally, as a method for applying glue to a material, a glue tank that stores glue and a roller that holds the glue on its surface by rotating while contacting a part of the surface with the glue in the glue tank A glue applying device including a and is widely known. In this apparatus, the glue is applied by bringing the roller into contact with the glue margin portion of the material while conveying the material.

However, this method has the following drawbacks. That is, since it is a contact type, it is not possible to partially apply the adhesive to the adhesive margin, that is, the adhesive surface. Further, after the gluing work is completed, the rollers, the glue tank, and other peripheral members must be washed, which requires time for maintenance. Moreover, when the material conveying speed is high, the phenomenon of glue breakage easily occurs. Moreover, the amount of glue applied is unstable.

In order to solve the above-mentioned drawbacks, a paste application method of spraying a paste onto a material using an injection nozzle has already been proposed (for example, JP-A-63-258726 and JP-A-1-161405). However, in the conventionally used injection nozzle, as shown by a broken line P in FIG.
The jetting speed of the glue jetted from the nozzle tended to decrease as soon as the valve started to close. Therefore, as shown in FIG. 7, the tail end portion 14a of the glue sprayed from the tip of the nozzle 3 after the valve is closed cannot reach the material 1 and adheres to the nozzle 3 so that the normal glue after that can be used. The phenomenon of obstructing the ejection was occurring.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in the conventional glue applicator, in which the tail portion of the glue sprayed from the nozzle is surely sprayed to the material. It is an object of the present invention to provide a spray nozzle type glue applicator that can be applied by applying.

[0007]

A first glue applicator according to the present invention comprises a nozzle opening (22), a valve seat (9) provided upstream of the nozzle opening with respect to the flow direction of the glue, and a valve. It has a valve element (5) that opens and closes with respect to the seat, and valve driving means that drives the valve element to open and close. The outer peripheral surface of the valve element is an inclined surface that is tapered toward the nozzle opening. The valve seat has an inclined surface that makes surface contact with the outer peripheral surface of the valve body. Further, the valve driving means is composed of a mover (4) integrated with the valve body and an electromagnetic driving means (coil 6, spring 8) for electromagnetically driving the mover.

Further, the second glue applying apparatus according to the present invention has atomizing air supplying means (nozzle cap 23, air pump 30) for supplying air to the nozzle opening (22).

[0009]

The valve element is driven by the electromagnetic drive means to reciprocate between the valve closed position in contact with the valve seat and the valve open position away from the valve seat. When the valve body is in the valve open position, glue is sprayed from the nozzle opening and applied to the material. When the valve body is moved from the valve open position to the valve closed position, the glue injection from the nozzle opening is stopped.

Both the valve body and the valve seat are formed with a so-called taper surface, which is a sloped surface that narrows toward the nozzle opening. Therefore, when the valve body moves from the valve open position to the valve closed position, the interval between the valve body inclined surface and the valve seat inclined surface gradually becomes narrower and finally comes into surface contact with each other. As a result, the injection speed of the glue that is pressed by the valve body and is injected from the nozzle opening gradually increases toward the end of injection. In addition, the valve body is driven by the spring included in the electromagnetic drive means to move from the valve open position to the valve closed position, so that the moving speed is faster than when driven by a cylinder or the like. As a result of the above, the spraying speed of the tail part of the glue sprayed from the nozzle opening is increased, and the glue can be accurately reached to the material surface to the end. That is, so-called glue breakage becomes good.

[0011]

EXAMPLE FIG. 2 shows an example of the glue applying device.
In the figure, the material 1 to which the glue is applied is linearly conveyed in the direction of arrow A. Glue allowance 1 provided on the side edge of material 1
The glue is applied to a.

An injection nozzle unit 2 is arranged below the moving path of the glue allowance 1a. As shown in FIG. 1, the injection nozzle unit 2 has a cylindrical nozzle 3 having a space at the tip (upper end in the drawing) and a space R inside, and is placed in the internal space R of the nozzle 3. A cylindrical movable element 4 that is movable in the axial direction of the nozzle 3, a conical valve body 5 that is integral with the movable element 4, and a position slightly rearward from the center of the nozzle 3 (lower position in the figure). The coil 6 is provided.

A hole 7 is formed inside the mover 4, and a compression spring 8 is provided in the hole. The action of the compression spring 8 urges the mover 4 toward the tip of the nozzle (upward in the drawing). A valve seat 9 having a tapered surface substantially parallel to the conical tapered surface of the valve body 5 is formed at a position on the inner wall of the nozzle 3 facing the valve body 5. The valve body 5 is pressed against the valve seat 9 by the spring force of the spring 8 at the standby time when the glue injection is not performed. This is the valve closed position of the valve body 5.

A power supply (not shown) is connected to the coil 6, and when the coil 6 is energized by the power supply, the mover 4 resists the spring force of the spring 8 and is located behind the nozzle (downward in the drawing).
It is attracted to and moves to the state shown in the figure. At this time, the valve body 5 takes a position away from the valve seat 9. This is the valve opening position of the valve body 5.

At the rear part of the nozzle 3 (the lower part in the drawing), a pipe 10 for glue feeding is formed, and a glue feeding pipe 11 is connected to this pipe 10. The glue supply pipe 11 extends to a glue tank 13 via a pump 12 as shown in FIG. The glue 14 applied to the material 1 is stored in the glue tank 13.

As shown in FIG. 3, which is a side view according to arrows III in FIGS. 2 and 2, as shown in FIG.
The upper part of is covered by a cover 17 which is integral with the machine frame 15 whose position is immovable. Further, the machine frame 15 has an air nozzle 16
Is fixed, and the tip of the nozzle is directed to the cover 17. The material 1 passes between the jet nozzle unit 2 and the air nozzle 16.

An air feed pipe 18 is connected to the air nozzle 16, and the air feed pipe 18 is connected to an air pump 20 via a pressure reducing valve 19.

The operation of the glue applicator having the above construction will be described below. In FIG. 2, a plurality of materials 1 are sequentially conveyed to the position above the nozzle unit 2 at appropriate intervals. The glue 14 in the glue tank 13 is pressure-fed by the pump 12 and fed to the jet nozzle unit 2 through the glue feeding pipe 11.

While the material 1 is not present on the nozzle unit 2, the coil 6 shown in FIG. 1 is in the non-energized state, and the valve body 5 is pressed against the valve seat 9 by the spring force of the spring 8. Therefore, the glue sent through the glue feeding pipe 11 fills the nozzle inner space P via the pipe line 10, the mover hole 7, and the through hole 21 provided so as to cross the mover hole 7. ..

When the material 1 to be conveyed (FIG. 2) arrives above the injection nozzle unit 2, the coil 6 is energized, the mover 4 is moved to the rear of the nozzle, and the valve body 5 separates from the valve seat 9. .. That is, the valve opens. When the valve is opened, the glue filled in the nozzle inner space P is sprayed to the outside through the gap between the valve body 5 and the valve seat 9 and the nozzle opening 22. The sprayed glue is applied to the glue allowance 1a of the material 1 (FIG. 2) conveyed on the nozzle opening 22.

When the rear end of the material 1 reaches above the nozzle opening 22 of the nozzle unit 2, the coil 6 is switched to the non-energized state again. Then, the valve body 5 instantly moves to the valve seat 9 by the spring force of the spring 8 to close the valve. In this embodiment, the valve body 5 is formed in a conical shape, and the valve seat 9 is formed as a tapered surface having the same inclination as the conical tapered surface of the valve body 5. The diameter of the valve element 5 and the valve seat 9 is larger than the diameter of the nozzle 22, and the nozzle 22
There is a cylindrical chamber 9a having a diameter larger than the diameter of. Therefore, the valve body 5
The injection speed of the glue that is pushed out by the piston operation of and is injected from the nozzle opening 22 increases immediately after the valve body 5 starts to be closed, as shown by the solid line Q in FIG. That is, the glue at the end of the glue ejected from the nozzle openings 22 has a high ejection speed. As a result, as shown in FIG. 6, all of the glue 14 ejected from the nozzle 3 adheres to the material 1. As shown in FIG. 7, the phenomenon that the glue at the end does not reach the material 1 due to the insufficient ejection speed does not occur.

Thereafter, every time a plurality of materials 1 are successively conveyed above the injection nozzle unit 2, the injection of glue and the stop of the injection are repeated.

2 and 3, the air nozzle 16 and the cover 17 arranged above the jet nozzle unit 2 are shown.
When the material 1 is conveyed in an inclined state from the normal position, the glue margin 1a is not located right above the nozzle 3, or when the material 1 is not present on the nozzle 3, the glue is ejected from the nozzle 3. Assuming an incorrect injection time that is injected,
It deals with such a case. The details will be described below.

As shown in FIG. 3, the cover 17 is provided so as to be inclined, and the glue collecting container 24 is provided at the lower end (right end in the drawing) of the cover 17.
Is attached. Air is introduced into the air nozzle 16 supported by the machine frame 15 by an air feed pipe 18,
Air is blown from the tip of the nozzle toward the cover 17 and the glue collecting container 24.

At the time of the above-described material slant conveyance or erroneous injection of the adhesive, the adhesive 14b ejected from the nozzle 3 adheres to the cover 17 and is captured, and is further sent into the adhesive recovery container 24 by the air flow from the air nozzle 16. If the cover 17 and the air nozzle 16 are not prepared, the glue sprayed from the nozzle 3 drops again near the nozzle and stains the area. However, according to the present embodiment in which the cover 17 and the air nozzle 16 are provided, there is no such concern.

Even when only the cover 17 is provided without providing the air nozzle 16, the glue can be recovered to a considerable extent.

FIG. 4 shows another embodiment. The difference of this embodiment from the previous embodiment shown in FIG. 3 is that the outer periphery of the nozzle 3 is covered with a cap 23 and air is introduced into the cap 23 by an air pump 30 via a pressure reducing valve 29. The introduced air flows through the opening 2 of the cap 23.
It is jetted from 3a toward the material 1.

By thus forming the air flow toward the material 1 at the tip of the nozzle 3, the glue sprayed from the nozzle 3 is atomized and applied to the material 1 at a higher speed. Therefore, the glue ejected from the nozzle 3 can be surely applied to the material 1 to the end thereof.

The air pump 30 shown in FIG. 4 can be used as the air pump 20 shown in FIG.

FIG. 5 shows still another embodiment. This embodiment is different from the first embodiment shown in FIG. 3 in that a nozzle tank 25 arranged around the nozzle 3 and a liquid tank 27 connected to the nozzle tank 25 via a metering pump 26 are provided. It is provided. The metering pump 26 is
A certain amount of liquid stored in the liquid tank 27, such as water, can be fed into the nozzle tank 25, or the liquid in the nozzle tank 25 can be discharged to the outside.

No liquid is stored in the nozzle tank 25 while the glue application operation by the nozzle 3 is performed. Nozzle tank 25 during the down time when glue application work is not performed
The interior is filled with the liquid sent from the liquid tank 27 by the metering pump 26. Therefore, at this time, the tip of the nozzle 3 sinks into the liquid. For example, during the rest time,
If the tip of the nozzle 3 is exposed to air, the glue present at the tip of the nozzle may solidify and the next glue may not be jetted. On the other hand, in the present embodiment in which the nozzle tip is submerged in the liquid during the pause time, such glue solidification does not occur, and normal glue injection can be restarted at any time.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the embodiments. For example, in each of the above-described embodiments, the case where the nozzle 3 sprays the glue vertically upward is illustrated, but the spraying direction is not limited to a specific angle.

The numbers of the injection nozzles 3 and the air nozzles 16 can be any number of 2 or more.

[0034]

According to the glue applicator of the first aspect of the present invention, the jetting speed of the tail end portion of the glue which is pushed by the valve body and is jetted from the nozzle opening is increased. Therefore, it is possible to make sure that the tail end reaches the material and is applied there.

According to the glue applicator of the second aspect, the glue ejected from the nozzle opening is atomized and further sprayed onto the material at a higher speed, so that the glue can be reliably applied to the material up to the tail end.

According to the glue applicator of the third and fourth aspects, when the glue sprayed from the nozzle opening is not accidentally applied to the material, the glue does not drop near the nozzle and stain the portion.

According to the fifth aspect of the present invention, it is possible to prevent the glue existing at the tip of the nozzle from solidifying when the glue applying operation is stopped, and to restart the glue applying operation at any time.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of an injection nozzle unit which is a main part of a glue applying apparatus according to the present invention.

FIG. 2 is a perspective view showing an entire glue applying device using the jet nozzle unit.

FIG. 3 is a side view according to arrow III in FIG.

FIG. 4 is a side view showing another embodiment of the glue applying apparatus according to the present invention.

FIG. 5 is a side view showing still another embodiment of the glue applying apparatus according to the present invention.

FIG. 6 is a diagram showing a state in which a glue is applied by the glue applying apparatus according to the present invention.

FIG. 7 is a diagram showing a state of applying a glue by a conventional glue applying device.

FIG. 8 is a graph showing a change over time in the jetting speed of the glue jetted from the nozzle.

[Explanation of symbols]

 1 Material 4 Movable Element 5 Valve Body 6 Coil 8 Compression Spring 9 Valve Seat 16 Air Nozzle 17 Cover 22 Nozzle Opening 23 Nozzle Cap 24 Glue Recovery Container 25 Nozzle Tank 26 Metering Pump 27 Liquid Tank 30 Air Pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiro Kuzuu 2951-4 Ishikawa-cho, Hachioji-shi, Tokyo Nireko Co., Ltd.

Claims (5)

[Claims] 1. A nozzle opening, a valve seat provided on the upstream side of the nozzle opening with respect to the flow direction of the glue, a valve body that opens and closes with respect to the valve seat, and a valve driving means that drives the valve body to open and close. A glue applicator for spraying glue from a nozzle opening to apply the glue onto a material, wherein the outer peripheral surface of the valve body is an inclined surface having a shape that narrows toward the nozzle opening, The valve seat has an inclined surface that makes surface contact with the outer peripheral surface of the valve body, and the valve drive means includes a mover integral with the valve body and an electromagnetic drive means for electromagnetically driving the mover. A glue applicator characterized by being constituted by: 2. A nozzle opening, a valve seat provided on the upstream side of the nozzle opening with respect to the flow direction of the glue, a valve body that opens and closes with respect to the valve seat, and valve driving means that drives the valve body to open and close. A glue applicator for spraying glue from a nozzle opening to apply the glue onto a material, characterized in that an atomizing air supply means for supplying air to the nozzle opening is provided. .. 3. The glue applicator according to claim 1, wherein a cover for adhering the glue sprayed from the nozzle opening is provided at a position facing the nozzle opening. 4. The cover is inclined, and a glue collecting container provided at a lower end of the cover, and a glue collecting air supply means for forming an air flow flowing toward the glue collecting container on a wall surface of the cover. The adhesive coating device according to claim 3, further comprising: 5. A nozzle tank for submerging the nozzle opening in the liquid, and a liquid supply / discharge means for supplying the liquid to the nozzle tank and discharging the liquid from the nozzle tank. Alternatively, the glue applying device according to the item 2.