JPS5855825B2 - Automatic supply device for adhesives, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can always supply an appropriate amount of a liquid with high viscosity, such as glue or paint, to a device that moves irregularly.

Many mechanisms have been developed to continue supplying constant amounts of materials and other liquids to various types of equipment that are constantly operating at the same speed.

However, in a device that frequently stops operating or changes its speed within a short period of time, simply continuing to supply a constant amount may result in oversupply or shortage.

For example, if we consider a device that specifically applies labels to containers such as bottles, the supply of bottles and the like is not always constant, and the supply is often interrupted.

However, since the supply amount of the adhesive applied to the labels was conventionally constant, if the supply of bottles or labels was interrupted, only the adhesive would be wasted, causing machine failure.

In other words, in conventional label pasting, as shown in Figure 5, the adhesive supply part of the machine supplies the glue melted in a heating tank through a hose containing heating wires to the spray nozzle g, and sprays the appropriate amount onto the drum b. The structure is such that the adhesive is continuously sprayed and applied to the back side of the label f via the drum C.

However, as mentioned above, the supply of containers, that is, the supply of labels, is discontinuous and interrupted many times in a day for various reasons, so workers have to adjust the injection amount at their own discretion each time. Alternatively, at present, excess adhesive is collected as a drip from the drum surface in a heated flow path, and transported again over a long distance to a heating tank for recovery.

The present invention has been made to improve these problems, and an object of the present invention is to provide an automatic supply device that can constantly supply an appropriate amount of liquid to a device that operates irregularly.

Next, an example will be described.

<A> Although the embodiment of the injection device will be described below with reference to adhesives, the same applies to other liquids.

A commercially available adhesive injection device consisting of a dissolving tank 1, a heating hose 11, and a gun 12 is used.

A heater 13 is built in around the melting tank 1, and the melted adhesive solution is supplied under pressure to the heated hose 11 by a pump 14.

The heating hose 11 also has a built-in heater.

The gun 12 at the end of the hose is an injection port that is opened and closed by a solenoid valve, and the signal input line of the solenoid valve of this gun 12 is provided along the heating hose 11 and is configured to be input from a terminal 15 on the melting tank 1 side. .

<Port> The adhesive sprayed from the drum group adhesive gun 12 is sprayed onto the surface of the drum 2 as in the conventional case.

For this spraying, the drum 3 is installed close to the drum 2, and for the gluing, the protrusion 31 of the drum 3 and for the spraying, the drum 20 is installed.
The surfaces are configured to touch.

The shape and dimensions of this protrusion 31 are the same as the shape and dimensions of the label 4 to which adhesive is to be applied, and the label 4 sucked by the label suction drum 5 and the protrusion 31 come into contact with each other at the same time. Adhesive is applied to the back side of the label 4.

For spraying, the drum 2 may be a simple cylindrical body, but if a hot-melt adhesive is used, the drum 2 itself is heated before spraying.

Therefore, for example, for spraying, an annular groove 21 concentric with the drum is formed from above inside the drum 2, and a heater 22 is suspended from the upper part in this annular groove 21, and the heater 22 is used to spray the drum 2.
heat up.

Of course, it is also possible to house the heater itself inside the spray drum 2 and take in electricity from the outside using a rotating contact.

〈ノ・〉Blade plate For spraying, a blade plate 6 is installed close to the surface of the drum 2.

The height of this blade plate 6 is somewhat lower than the height of the drum 2 during spraying, and the entire blade plate 6 is mounted on, for example, a guide rail 61, and slides on this rail 61 so that the spray comes into contact with the drum 2. It is possible to leave.

The sliding movement of the blade plate 6 is achieved by, for example, attaching the tip of a horizontal bolt 63 that is screwed into an immovable pillar 62 and passing through the bracket 6 of the blade plate 6.
It is also possible to adopt a structure in which the screws 4 are screwed to the nuts 65.

A horizontal upper shelf 66 and a lower shelf 67 are protruded from one side of the blade plate 6, that is, at the upper and lower ends of the rotation upstream side when the blade plate 6 is located close to the rotating spray drum 2.

As a result, when the adhesive on the surface of the drum 2 reaches a certain thickness, it is collected by the blade plate 6 and a cylinder of adhesive is formed.
It forms and develops vertically.

When the upper and lower ends of the cylinder a hit the upper and lower shelves 66° and 67, growth in the vertical direction is blocked, so if the adhesive continues to be sprayed, the cylinder will grow in the direction of increasing diameter.

Moreover, if the upper shelf 66 is not provided, the cylinder will continue to grow upwards when adhesive is oversupplied.

That is, when there is excessive supply, the diameter of the cylinder a appears as an abnormal length due to the scraping of the blade plate 6.

<2> Detector 7 A detector 7 for detecting the diameter or length of the adhesive cylinder a is installed near the blade plate 6 and the spray drum 2.

As the detector 7, commercially available devices can be used, such as an air sensor that sends a small amount of air and detects changes in the amount of reflected air, or a photoelectric type that uses a projector and a receiver.

Detector 7 is a photoelectric switch with a built-in lamp used in the example.
By setting a constant relative angle between the built-in light projector 71 and light receiver 72, it is possible to detect the presence of a convex portion of a minute object at an intersection.

(Fig. 3) The angles of the emitter 71 and the light receiver 720 can be easily adjusted using knobs, and the detection limit can be set freely.

The detection signal is amplified by an amplifier 73. <E> The signal amplified by the detection signal feedback amplifier 73 is input to the solenoid valve of the adhesive spray gun 12.

The input method is such that when the detector 7 is activated, that is, when the adhesive cylinder a becomes thicker than a certain diameter, the solenoid valve of the gun 12 becomes inactive and closes the passage of the gun 12. do.

Next, the overall operation will be explained.

<A> Operation of a label pasting machine For example, the overall operation when the apparatus of the present invention is used in a known label pasting machine will be explained.

Labels 4 are sucked one by one from the label holder 8 to the label suction drum 5 and approach the point of contact with the drum 3 for gluing.

(Fig. 4) On the other hand, during spraying, the adhesive is injected from the gun 12 onto the drum 2, and during normal operation, the adhesive passes through a small gap with the blade plate 6 and is applied to the protrusion 31 of the drum 3. Apply.

Accurately synchronized with the rotation of the protrusion 310, the label 4 on the suction drum 5 is fed upside down and adhesive is applied.

On the other hand, a container such as a bottle is sent by the container transport drum 9 and is wrapped around the outer periphery of the label 4 in synchronization with the adhesive coated label 4.

The above structure is well known except for the explanation part of the blade plate 6, so it will not be explained in further detail. It goes without saying that the device of the present invention can also be used in machines.

<Exposure> If the operating labels such as blade plates are being supplied smoothly, there is no problem in spraying since the adhesive on the surface of the drum 2 is also consumed in fixed quantities.

However, if the supply of bottles etc. is temporarily interrupted or there is a small malfunction, a fixed amount of adhesive will continue to be ejected from the gun 12, so the amount of adhesive on the surface of the drum 2 will increase, and if it continues to spray, it will drop downwards. It drips and flows out.

However, if the blade plate 6 of the present invention is positioned with a slight distance from the surface of the drum 2, excessive supply may cause the drum 2 to
The adhesive that has increased on the surface is scraped off by the blade plate 6, and as described above, a cylinder a of adhesive is formed at the tip of the blade plate 6, which gradually increases in diameter and length.

When the value exceeds a certain limit, the detector 7 is activated, and the activation signal is amplified by the amplifier 73 and input to the solenoid valve of the gun 12 to stop the injection of adhesive.

When the whole body starts moving again and the adhesive starts to be consumed, the diameter or length of the cylinder a becomes smaller, and when it falls within a certain limit, the detection signal causes the gun 12 to restart the adhesive injection.

In this case, the limit for stopping injection can be brought to an optimal state by adjusting the distance between the blade plate 6 and the drum 2, and if possible, by adjusting the detector.

The above is an explanation of the use of the present invention in the part where adhesive is applied to the back side of the label, but it can of course be used for purposes other than labels, such as supplying ink and paint during printing, supplying lubricating oil, etc. It can be widely used as a device that automatically sends average amounts of large liquids.

As described above, the present invention sprays the liquid to be supplied onto a drum using an injection gun, positions the blade plate slightly away from the surface of the drum, and scrapes it off with the blade plate to form a cylinder of liquid. This is an automatic feeding device that detects changes and opens and closes the gun passage based on the signal.

Therefore, no matter how irregular the operation of the entire apparatus is, normal supply is always possible without causing excess supply of liquid or, of course, causing shortage.

[Brief explanation of the drawing]

Fig. 1: An explanatory diagram of one embodiment of the automatic supply device for adhesives, etc. according to the present invention, Figs. 2 and 3: An explanatory diagram of its main parts, Fig. 4: A plan view thereof, Fig. 5 : A perspective view of a conventional supply device for adhesive, etc. 2: Blow drum, 6: Blade plate, 7: Detector, 12 guns.

Claims (1)

[Scope of Claims] 1. A liquid such as an adhesive to be supplied is sprayed onto a drum using an injection gun, a blade plate is positioned slightly away from the surface of the drum, and the liquid generated when the blade plate is scraped off. An automatic supply device for adhesives, etc., which detects changes in a cylinder and opens and closes the injection path of a gun based on the detection signal.