JPH02203955A - Method and apparatus for controlling injection of paste - Google Patents

Abstract

PURPOSE:To prevent the injection amount of paste from increasing as compared with linear injection by injecting paste to the packing piece passing a paste gun in a spot like state at a predetermined interval within a variable speed region where a moving speed is slower than that of the packing piece passing the paste gun within a constant speed region. CONSTITUTION:Paste B is injected to a packing piece 1a moving at a variable speed or at a constant speed from a paste gun 2 in nearly the same amount. Then, the paste B is injected to the packing piece 1a, which passes in front of the paste gun 2 within the variable speed moving region from the moving start time of the packing piece 1a to the constant speed transfer time thereof, in a spot-like state at a predetermined interval in the moving direction thereof. Further, the paste B is linearily injected to the packing piece 1a passing in front of the paste gun 2 within a constant speed moving region in the moving direction thereof. That is, the injection amount of the paste is prevented from increasing as compared with linear injection by the spot like injection of the paste and the spots of the paste become continuous by the pressure contact of the packing piece after the injection of the paste and adhesive strength corresponding to linear injection is obtained.

Description

Detailed Description of the Invention <Field of Industrial Application> The present invention provides a method and apparatus for controlling glue injection in which approximately the same amount of glue is injected from a glue gun onto a packaging piece moving at variable or constant speeds. Regarding.

<Prior art> Conventionally, this type of glue indexing control method and device, as disclosed in Japanese Patent Application Laid-Open No. 59-359, detects the moving speed of a packaging piece and detects the glue (injected from one gun). By changing the speed of the glue in proportion to the moving speed of the packaging piece,
There is a method that makes the injection amount per unit length of the packaging piece in the moving direction substantially constant.

<Problems to be Solved by the Invention> However, in such conventional glue flow control methods and devices, the injection speed is changed by changing the glue injection pressure by adjusting the pump device that feeds the glue. For example, when the moving speed of a packaging piece is gradually accelerated, such as during startup, the injection pressure of the glue must be continuously changed over a wide range, but the glue is slightly indexed depending on its temperature and viscosity. Even if the pressure changes only, the injected glue tends to become stringy, which is the so-called stringing phenomenon, and as mentioned above, if the glue injection pressure changes continuously over a wide range, the It is difficult to prevent the stringy phenomenon over the entire range, and the thread-like glue adheres to packaging pieces other than the glued position, not only making it impossible to maintain the high quality of the finished product, but also causing the glue to stick to guides, etc. There is also a problem that it may adhere to the surface of the metal and cause malfunction.

SUMMARY OF THE INVENTION In view of the conventional circumstances, it is an object of the present invention to inject substantially the same amount of glue to packaging pieces moving at different speeds without continuously changing the indexing pressure over a wide range.

<Means for Solving the Problems> The technical means taken by the present invention to solve and overcome the above problems is that gluing is carried out at the front of the gun in the variable speed movement region from the start of movement of the packaging piece to the time of constant speed transfer. Glue is injected in dots at predetermined intervals in the direction of movement of the packaging piece passing through the glue gun. A detector for sensing the presence or absence of a packaging piece is installed on the upstream side of the gluing gun in the direction of movement of the packaging piece, and the detector and the gluing gun are electrically connected to the gun to prevent the movement of the packaging piece. Gluing is applied to packaging pieces that pass in front of the J-gun in a variable speed movement range from the start of movement of the packaging piece to the time of constant speed movement depending on the speed. The present invention is characterized in that a packaging piece passing in front of the gluing gun in the fast moving region is provided with a control section that causes the gluing gun to operate continuously for a set time.

<Function> According to the above-mentioned technical means, the present invention is capable of gluing in the constant speed region (on the packaging pieces passing through the gun, gluing on the packaging pieces passing through the gun, in the variable speed region where the moving speed is slower than on the packaging pieces passing through the gun). By injecting the glue in dots at predetermined intervals, the amount of glue injected is not increased compared to linear injection, and the dots of glue are connected by pressure contact of the packaging piece after the glue injection, forming a linear shape. It has adhesive strength similar to that of injection molding.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

In this embodiment, as shown in FIG.
), and the flaps (1a) (Ia) of the carton (1
) are sandwiched between the front and rear surfaces of the carton (1) by the transport claws (3)..., and these transport claws (3) are driven to transport the carton (1) horizontally along the transport path (A>) and move it upward or downward. Fold one of the flaps (1a) (1a) in the closing direction, and pass the glue sticks disposed facing each other through the front of the gun (2) (2) to apply the glue to the outer surface of the flap (la) (Ia). (B) are respectively injected, and then the other flaps (1b) (1b) are folded in the closing direction and pressed against the outer surfaces of the one flap (1a) (1a>) to be glued.

Each gluing gun (2) has a valve part (not shown) that opens and closes a passage leading to its nozzle (2a), and a supply port (2b) through which pressurized, for example, hot melt base glue is supplied. The solenoid valve (4) is driven to open and close the valve part, thereby causing the glue (B) to flow into the passageway and into the nozzle (2a).
) to the outer surface of the closed flap (1a).

Further, a detector (5) for detecting the presence or absence of the carton (1) is installed on the upstream side of either one of the glued guns (2), and the detector (5) and the solenoid valve (4) is electrically connected to the control section (6).

The control unit (6) includes a constant speed changeover circuit (6a), a dotting circuit (6b), a line dotting circuit (6C), and a dotting circuit (6
b) A large number of AND circuits (6d+
)(6dz)...(6dn) and the line driving circuit (6dz)...(6dn)
AND circuit (6e) that inputs the signal from C) and these AND circuits (61L) (6d2) - (6d++
) (60), an OR circuit (6f) that inputs the signal from
It consists of an interface circuit (6g) that inputs the signal from the OR circuit (6f).

The variable/constant speed switching circuit (6a) is composed of a sequencer or the like of a conventionally well-known structure, and includes the above-mentioned detector (5), the conveyance claw (3),
The detector (5) is electrically connected to an operation switch (7) that controls ON/OFF of the drive of the entire device, such as, and a speed changeover switch (8) that changes the drive speed of the entire device
, a drive signal from the operation switch (7), and a speed signal from the speed changeover switch (8), and each time a sensing signal is input based on the speed signal after inputting the drive signal, A signal is selectively outputted to the dotting circuit (6b) or the line aging circuit (6C).

That is, the speed change/constant speed switching circuit (6a) controls the speed at which the drive speed of the entire apparatus passes in front of each glue gun (2) during the speed change range from the time of startup until the drive speed reaches the constant speed range. 1)
The number and passing time of each drive speed are different, and the number and passing time are determined in advance through experiments, and this is input as a set value.Each time a sensing signal is input, it is compared with the set value for each drive speed to determine that it is in the shifting range. If so, the signal is sequentially output to the dotting circuit (6b), and when it is determined that the speed has entered the constant speed region, the signal is output to the dotting circuit (6C).
Outputs a signal to.

Moreover, each time the switching circuit (6a) inputs a sensing signal, a large number of AND circuits <6d+)(6d2)...(6d
A signal is also output to each one input terminal of η)(6e') based on the above set value.

Furthermore, in this embodiment, the driving speed in the constant speed region is changed to N+rl)l11. by operating the speed changeover switch (8). N2rp
It can be switched in three stages: m, N3 rpm.

The dotting circuit (6b) is composed of an electronic cam or the like having a conventionally well-known structure, and controls the number and size of dots to be applied at appropriate intervals within a predetermined width dimension of each flap (1a), and each solenoid valve ( 4) are experimentally determined for each drive speed and inputted as set values, and each time a signal is input from the switching circuit (6a), the set values for each drive speed are changed. AND each glueing signal at each set interval based on
Output to the usage input terminal of the circuit (6d+) (6d2) - (6dy+).

The line dot circuit (6C) is formed of an electronic cam etc. in the same way as the dot dot circuit (611), and approximately coincides with the combination of the dot-shaped glue marked F within the predetermined width dimension of each flap (1a). The driving start timing and driving end timing of the linear frame and correction values such as the delay time of each solenoid valve (4) are determined in advance by experiment for each drive speed in the constant speed range, and these are input as set values. Each time a signal is input from the switching circuit (6a), a gluing signal is outputted to the usage input terminal of the set time AND circuit (6e) based on the set value for each drive speed.

The term "within the predetermined width dimension of the flap (1a)" as used herein refers to a portion obtained by removing an appropriate width from both ends of the flap (1a) in the transport direction. This is the position where the glue (B) does not protrude.

And each of these A N D circuits (6d+) (6d2
)...(6dn)(6(!> is dotted circuit (6b)
Alternatively, a signal is outputted to the interface circuit (6q) via the OR circuit (6t) only when the gluing signal from the line punching circuit (6C) and the signal from the switching circuit (6a) are input at the same time.

The interface circuit (6) connects each solenoid valve (
4) and converts the input signal from the OR circuit (6f) into an electrical signal to each solenoid valve (4).
Controls the energization to the opening/closing operation.

Next, the operation of such a glue injection control device will be explained according to the time chart shown in FIG.

First, when the speed changeover switch (8) is operated to set the drive speed in the constant speed region to N1 and the operation switch (7) is turned on, the transport claws (3)... start to drive and the cartons (1 ) begins to be transferred, and the transfer speed gradually increases.

In this speed change region, the switching circuit (6a) and the dotting circuit (
6b), for example, if the width of the flap (1a) is approximately 40 mm and the detector (5) is continuously sensing the cartons (1), three cartons (1) will pass; By energizing each solenoid valve (4) for 8 to 15 m seconds, dots of glue are injected at set intervals in the transfer direction within the predetermined width dimension of the flap (1a), and when the speed reaches the constant speed region, the switching circuit (6a ) and the line-striking circuit (6C), linear glue is injected within a predetermined width dimension of the flap (1a) in an amount approximately equal to the total amount of the dotted glue.

Furthermore, when the operation switch (7>) is turned OFF from this constant speed state and the transport speed of the carton (1) gradually decelerates,
Dots of glue are injected in the same way as at the time of starting and shifting described above.

Also, operate the speed selector switch (8) to change the drive speed to N.
If the speed is slowed down from 1 to N2 or N3, the speed signal is output to the switching circuit (6a), and the signals output from the circuit (6a) to the dotting circuit (6b> and line dotting circuit (6C)) and the signals Both circuits (6b) (6C) to each AND circuit (6
The gluing signals output to d+ )(6d2)-(6dn)(6e) are also automatically switched.

Furthermore, although the operation switch (7) is ON and a drive signal is output to the switching circuit (6a), the conveyance claw (3)...the carton (1) is not supplied between them and the switch is switched from the detector (5). circuit(
When the sensing signal is not output to the circuit (6a), the circuit (6a)
) to each AND circuit (6d+)(6d2)-(6
dn) (6e), the injection of the glue (B) is stopped because the signal is not output from each one of the input terminals.

Then, one flap (1a) after the glue (B) is injected.
) The other flap (1b) is pressed and glued to the outer surface, but in the case of dotted glue, the dotted glue connects to each other when pressed, and in practical terms has an adhesive force similar to that of linear glue.

Note that the control section (6) is not limited to the above-mentioned one, and may be configured in any manner as long as it functions in the same way.
and the speed changeover switch (8) to have a correlation with the drive speed, but the carton (
A similar effect may be achieved by detecting the moving speed of the carton (1) in step 1) or by detecting the moving speed of the carton (1) through the variable speed region and constant speed region.

Furthermore, in this embodiment, the gluing guns (2) (2) are arranged facing each other, and the two guns (2) are controlled in the same manner. However, the present invention is not limited to this. Each carton (
1) are shifted in the transfer direction, and each glue is applied using a gun (2).
It may be controlled separately by both detectors (5) disposed on the upstream side of the detector.

<Effect of the invention> Since the present invention has the above configuration, it has the following advantages.

■ Gluing in the constant speed region Gluing in the variable speed region, where the moving speed is slower than that of the packaging pieces passing through the gun, is done by injecting glue in dots at predetermined intervals onto the packaging pieces passing through the gun. The amount of glue injected is not large compared to linear injection, and the pressure of the packaging pieces after glue injection creates a series of dots of glue that have an adhesive force similar to linear injection, so the moving speed is different. Approximately the same amount of glue can be injected into the packaging piece over a wide range without continuously changing the injection pressure.

Therefore, the glue is not continuous in the form of a string, unlike conventional methods that require continuous changes in the indexing pressure of the glue over a wide range, and the glue application during speed changes can be made equivalent to the glue application during constant speed. The finished product can be maintained at high quality and there is no risk of malfunction.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram and block diagram of a glue injection control device showing one embodiment of the present invention, and FIG. 2 is a time chart. B...Glue 1a...Packaging piece 2...Gluing gun 5...Detector 6...Control unit

Claims (2)

[Claims] (1) In a glue injection control method in which approximately the same amount of glue is injected from a glue gun to a packaging piece moving at a variable speed or at a constant speed, glue is applied in a variable speed movement region from the start of movement of the packaging piece to the time of constant speed transfer. Glue is injected in dots at predetermined intervals in the direction of movement of the packaging piece passing in front of the gun, and glue is injected in a line in the direction of movement of the packaging piece passing in front of the gluing gun in the constant speed movement area. A glue injection control method characterized by injection in a shape. (2) In a glue injection control device that injects approximately the same amount of glue from a glue gun to a packaging piece that moves at variable or constant speed, a detector that detects the presence or absence of a packaging piece on the upstream side of the packaging piece moving direction of the glue gun. a packaging piece that is electrically connected to the detector and the gluing gun and passes in front of the gluing gun in a variable speed movement range from when the packaging piece starts moving to when it moves at a constant speed according to the moving speed of the packaging piece. The glue injection control is characterized by comprising a control section that causes the glue gun to operate intermittently for a set period of time, and that causes the glue gun to operate continuously for a set period of time for packaging pieces passing in front of the glue gun in a constant speed movement region. Device.