JP2506428B2 - Glue detection controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention injects approximately the same amount of glue from a gluing gun to a packaging piece that moves at a constant speed through a variable speed movement area from the start of movement.
The present invention relates to a glue detection control device for detecting the glue injected to a packaging piece by a glue detector arranged on the downstream side of the glue gun.

<Prior Art> Conventionally, as a glue detection control device of this type, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 51-13839 and Japanese Patent Application Laid-Open No. 59-359, the moving speed of an object to be coated is detected and a fixed amount of glue is applied regardless of the moving speed of the object to be coated. As disclosed in, for example, Japanese Patent Application Laid-Open No. 61-161176, a predetermined number of spots of glue are injected in the moving direction in a variable speed moving area according to the moving speed of an object to be moved at appropriate intervals. By doing so, the linear glue ejected in the constant velocity moving region and the total ejection amount are substantially the same.

There is also a glue detector that detects the presence or absence of glue injected at a predetermined position on the packaging piece.

<Problems to be Solved by the Invention> However, in such a conventional glue detection control device,
Although it is possible to detect the injection start position and the injection end position of the linear glue that is continuously ejected in the moving direction of the packaging piece and calculate its length, if the diameter of the point glue is small or the interval is narrow. As the number of spot glues and their respective injection positions cannot be detected accurately, the glue does not stick out or runs short on the finished product, and the quality of the finished product cannot be maintained at a high level. However, there is a problem that it may cause an accident such as a movement obstacle of a package piece when it adheres to the like.

In view of such conventional circumstances, the present invention changes the number and the injection position of the point glue even if the diameter of the point glue is small or the interval is narrow while switching the injection of the glue between point and linear according to the moving speed of the packaging piece. The purpose is to accurately detect and determine defective products.

<Means for Solving the Problem> The technical means taken by the present invention to solve the above-mentioned problems are a package piece detector arranged on the upstream side of the gluing gun to detect the presence or absence of the package piece, and a downstream of the gluing gun. A glue detector that detects the presence or absence of glue on the side and a control unit that electrically communicates with the packaging piece detector, the glue detector, and the gluing gun are provided, and the control unit responds to the moving speed of the packaging piece. And a constant speed switching circuit for determining whether the package is in a variable speed moving area or a constant speed moving area, and a glueing signal is sent every time a shift judgment signal is input from the constant speed changing circuit. A dot forming circuit that intermittently outputs to the gluing gun at every set interval, and a line drawing that continuously outputs a gluing signal to the gluing gun for a set time each time a constant speed judgment signal is input from the shift constant speed switching circuit. Input from the circuit and the shift constant speed switching circuit When the constant signal is in the speed change region, the one-shot pulse signal when the detection signal input from the glue detector is differentiated and rises above the set level is output, and when the constant signal is in the constant speed region, the glue detection is performed. Selector circuit that differentiates the detection signal input from the detector and outputs a continuous signal from the time it rises to the time it falls from the set level, and the output signal from this selector circuit for each speed range or constant speed. It is characterized by comprising a pass / fail judgment circuit for judging whether it is normal or abnormal by comparing with a set value for each area.

<Operation> According to the above-mentioned technical means of the present invention, while the moving speed of the packaging piece is in the speed change region, the constant speed switching circuit and the puncturing circuit cause the glue from the gluing gun to the packaging piece to form a spot at every set interval. When it is ejected and reaches the constant speed region, the glue is linearly ejected by the variable speed constant speed switching circuit and the line striking circuit, and the glue detector is detected by the glue detector and selected. By the circuit and pass / fail judgment circuit, only the differential rise signal from the glue detector is input during the speed change region, and the differential rise signal from the glue detector is input during the constant speed region. By comparing these input signals with the set values for each shift area or each constant speed area, it is possible to discriminate between the packaging piece in which the glue is normally ejected and the packaging piece in which the glue is not normally ejected. is there.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

In this embodiment, as shown in FIG. 1, the packaging piece is a flap (1a) (1a) of a carton (1), and the front and rear surfaces of the carton (1) are sandwiched by conveying claws (3). While the carton (1) is horizontally moved along the transfer path (A) by driving the transfer claws (3), one of the upper and lower flaps (1a) and (1a) is folded in the closing direction, respectively, and arranged so as to face each other. The glue (B) is ejected onto the outer surfaces of the flaps (1a) (1a) by passing the front of the glue guns (2) (2),
After that, the other flaps (1b) (1b) are folded in the closing direction, and the outer surfaces of the one flaps (1a) (1a) are pressed against each other and glued.

Each gluing gun (2) has a valve portion (not shown) that opens and closes a passage leading to its nozzle (2a), and a supply port (2b) to which pressurized hot melt glue is supplied, By driving the solenoid valve (4) to open and close the valve portion, the glue (B) is caused to flow into the passage, and is ejected from the nozzle (2a) toward the outer surface of the closed flap (1a) for application.

On the upstream side of either one of the gluing guns (2), a wrapping piece detector for detecting passage of the carton (1) corresponding to the wrapping piece, that is, a carton detector (5), is installed in the gluing gun (2). On the downstream side, glue detectors (6) and (6) for detecting the glue (B) ejected on the outer surface of each flap (1a) are respectively arranged, and both of these detectors (5) (6) (6) Also, both solenoid valves (4) and (4) are electrically connected to a control unit (7) which constitutes speed detecting means and switching means.

The configuration of the control unit (7) will be described with reference to FIG. 1. First, a drive signal from the operation switch (8) for controlling ON / OFF of the drive of the entire device such as the conveying claws (3) ... A speed signal is outputted from the speed changeover switch (9) for changing the speed, and a carton detection signal is outputted from the carton detector (5) to the constant speed constant speed changeover circuit (7a).

The variable speed constant speed switching circuit (7a) is composed of a sequencer or the like having a conventionally well-known structure, and each gluing gun (2) is provided in the variable speed region from the time when the driving speed of the entire device reaches the constant speed region to the constant speed region.
The number of cartons (1) passing in front of the vehicle and the driving time are determined in advance for each driving speed with different transit times, and this is input as a set value, and each time a carton sensing signal is input,
If it is judged that it is in the speed change area by comparing with the set value for each drive speed, judgment signals are sequentially output to the dot circuit (7b), and if it is judged that it is in the constant speed area, it is judged to the line drawing circuit (7c). Output a signal.

In this embodiment, the drive speed in the constant speed region is switched to three levels of N ₁ rpm, N ₂ rpm and N ₃ rpm by operating the speed selector switch (9).

In addition, the shift constant speed switching circuit (7a) receives a number of AND circuits (7d ₁ ) (7d ₂ ) ... (7d _n ) each time a carton detection signal is input.
A signal is output to each one input terminal of (7e) based on the set value, and the determination signal is also output to a selection circuit (7l) described later.

The dot forming circuit (7b) is composed of an electronic cam or the like having a conventionally well-known structure, and the number and size of dot-like glue to be glued at appropriate intervals within a predetermined width dimension of each flap (1a) and each solenoid valve (4). ) The delay time and other correction values are experimentally determined for each drive speed, and this is input as a set value. Each time a judgment signal is input from the switching circuit (7a), the set value for each drive speed is set. The glueing signal based on
Output to the other input terminal of D circuit (7d ₁ ) (7d ₂ ) ... (7d _n ).

Like the dot forming circuit (7b), the line forming circuit (7c) is composed of an electronic cam or the like, and the line adhesive is formed within the predetermined width of each flap (1a) so as to be substantially equal to the total amount of the point adhesive. The start timing and the end timing and the correction values such as the delay time of each solenoid valve (4) are experimentally obtained in advance for each drive speed in the constant speed region, and these are input as set values. Each time the judgment signal is input from 7a), the glueing signal is set based on the set value for each drive speed and the setting time AND circuit (7e)
Output to the other input terminal of.

The term “within the predetermined width dimension of the flap (1a)” as used herein refers to a portion in which both ends of the flap (1a) in the transfer direction are appropriately excluded from the width dimension. It is a position that does not stick out.

And these AND circuits (7d ₁ ) (7d ₂ ) ... (7d _n ).
(7e) is the interface circuit (7g) via the OR circuit (7f) only when the glue signal from the dot circuit (7b) or the line circuit (7c) and the signal from the switching circuit (7a) are simultaneously input. Signal is output to.

The interface circuit (7g) is electrically connected to each solenoid valve (4) and converts the input signal from the OR circuit (7f) into an electric signal to control the energization of each solenoid valve (4) to open and close. Excuse me.

On the other hand, each glue detector (6) is, for example, an invisible ray type sensor such as infrared rays, and when it detects the glue (B) injected to each flap (1a), it outputs a detection signal to the amplifier circuit (7h), It is amplified by the amplifier circuit (7h) and output to the differential rising edge detection circuit (7i) and the differential falling edge detection circuit (7j).

The differential rise detection circuit (7i) is composed of a comparator, etc., and outputs to the one-shot circuit (7k) only when it differentiates the detection signal input via the amplification circuit (7h) and rises above the set level. The one-shot pulse signal is output to the selection circuit (7l) and also to the set of the flip-flop (7n) described later.

The differential falling detection circuit (7j) differentiates the detection signal contrary to the differential rising detection circuit (7i) and outputs it to one input terminal of the OR circuit (7m) only when it falls below the set level.

The carton detection signal from the carton detector (5) is input to the other input terminal of the OR circuit (7m), and when the falling signal or the detection signal from the differential falling circuit (7j) is input, the flip-flop ( Output to reset of 7n).

The flip-flop (7n) is a differential rising edge detection circuit (7i)
When there is an input to the reset from, the output to the selection circuit (7l) starts, and when the input from the OR circuit (7m) to the reset, the output stops.

The selection circuit (7l) receives the input signal from the one-shot circuit (7k) through the interface circuit (7o) when the judgment signal input from the switching circuit (7a) is in the speed change region, and then the pass / fail judgment circuit (7p). When it is in the constant speed region, the input signal from the flip-flop (7n) is output to the pass / fail judgment circuit (7p) through the interface circuit (7o).

The pass / fail judgment circuit (7p) inputs the speed signal from the speed changeover switch (9), and also drives the number of point glue and its injection position and the length of linear glue and its injection position in advance under normal conditions. It is found by experiment for each speed, and this is input as a set value. Each interface circuit (7o) (7o)
Each time a signal is output from the vehicle, it is compared with the set value for each shift area or each constant speed area to determine whether it is normal or abnormal, and when abnormal, only the carton (1) is transferred to the transfer path (A).
It is designed to perform an abnormal operation such as being removed to the outside or stopping the driving of the conveying claws (3).

Next, the operation of such a glue detection side control device is shown in FIG.
Description will be given according to the time chart of (B).

First, when the operation switch (8) is turned on while the drive speed in the constant speed region is set to N ₁ by operating the speed changeover switch (9), the driving of the transport claws (3) ... Starts and the carton (1) is started.
The transfer speed is gradually accelerated.

In this speed change region, the switching circuit (7a) and the spotting circuit (7b), for example, the width of the flap (1a) in the transfer direction is about 40 mm, and the carton detector (5) continuously detects the carton (1). 2A, three cartons (1) pass through, each solenoid valve (4) is energized for 8 to 15 msec, and the points are within the predetermined width of each flap (1a). Paste is ejected in the transfer direction at set intervals,
When it reaches within the constant speed area, the linear glue is injected into the predetermined width dimension of each flap (1a) by the switching circuit (7a) and the striking circuit (7c) in an amount substantially equal to the total amount of the above-mentioned spotting glue. It

In addition, when the operation switch (7) is turned off from this constant speed state and the transfer speed of the carton (1) is gradually reduced,
The point glue is ejected in the same manner as at the time of the start gear shift described above.

Therefore, when the two flaps (1a) and (1b) are pressed against each other, the spot glues are connected to each other, and practically have an adhesive force similar to that of the linear glue.

Further, when the speed changeover switch (9) is operated to decrease the drive speed in the constant speed region from N ₁ to N ₂ or N ₃ , the speed signal is output to the changeover circuit (7a) and the circuit (7a) ) Output to the dot forming circuit (7b) and the line forming circuit (7c) and the AND circuits (7d ₁ ) (7
The gluing signals output to d ₂ ) ... (7d _n ) (7e) are also automatically switched so that the gluing (B) is ejected in a dot shape or a linear shape as shown in FIG. 2 (B).

Furthermore, although the operation switch (8) is ON and the drive signal is being output to the switching circuit (7a), the carton (1) is not supplied between the transfer claws (3), ... And the switching circuit from the carton detector (5). When the sensing signal is not output to (7a), the circuit (7a)
Since no signal is output from the respective AND circuit (7d ₁ ) (7d ₂ ) ... (7d _n ) (7e) to each one input terminal, the injection of the glue (B) is stopped.

Then, the glue (B) ejected to each flap (1a) is detected by each glue detector (6), and when the moving speed of the carton (1) is in the speed change region, only the differential rising signal of the one shot is taken. In place of the pulse signal, or when in the constant speed region, the time from the differential rise to the differential fall is compared with the set value for each speed change region or each constant speed region, and the glue (B) is normally injected. The carton (1) that has been ejected is distinguished from the carton (1) that has not been normally ejected.

The control unit is not limited to the one described above, and may have any structure as long as it has the same action. Further, the control unit (7) and the speed changeover switch (9) are interlocked to correlate with the drive speed. Although related, the same operation is performed by detecting the moving speed of the carton (1) passing through in the speed change area or by detecting the moving speed of the carton (1) through the speed change area and the constant speed area. You can

Further, in this embodiment, the case where the gluing guns (2) and (2) are arranged so as to face each other and both of them are controlled in the same manner is shown.
The present invention is not limited to this, and the gluing guns (2) are arranged so as to be displaced in the transporting direction of the carton (1), respectively, and are separately provided by both detectors (5) arranged upstream of the gluing guns (2). You may control.

<Effects of the Invention> Since the present invention has the above-mentioned configuration, it has the following advantages.

When the moving speed of the package is within the speed change range, the constant speed changeover circuit and the puncturing circuit cause the glue to be ejected from the gluing gun to the package at a set interval, and when it reaches the constant speed range, the constant speed change is performed. The glue is linearly ejected by the switching circuit and the wire striking circuit, and the glue detector detects the glue injected into this packaging piece. Only the differential rising signal from the detector is input, and when it is in the constant speed region, the differential detector from the rising edge to the differential falling edge is input. Compared with the set value for each area, it distinguishes between the packaging pieces in which the glue is normally ejected and the packaging pieces in which the glue is not normally ejected, so that the glue injection is dotted according to the moving speed of the packaging pieces. While switching to and linear, if the diameter of the dot glue is small or the spacing is The number and the exit position even have can be accurately detected to determine the defective products.

Therefore, when the diameter of the point glue is small or the interval is narrow, the finished product can be maintained in high quality and the movement of the packaging piece can be obstructed compared to the conventional one in which the number and the respective injection positions cannot be accurately detected. It can prevent accidents such as.

[Brief description of drawings]

FIG. 1 is a schematic diagram and block diagram of a glue detection control device showing an embodiment of the present invention, and FIGS. 2 (A) and 2 (B) are time charts for each drive speed. B ... Glue, 1a ... Wrapping piece (flap), 2 ... Gluing gun, 5 ... Wrapping piece detector (carton detector), 6 ... Glue detector, 7 ... Control section 7a ... Variable speed constant speed switching circuit, 7b ... Dotting circuit 7c ... Strike circuit, 7l ... Selection circuit

Claims (1)

(57) [Claims] 1. A substantially equal amount of glue (B) is injected from a gluing gun (2) to a packaging piece (1a) that moves at a constant speed through a variable speed moving area from the start of movement, and this gluing gun (2) In the glue detection control device for detecting the glue (B) injected into the packaging piece (1a) by the glue detector (6) arranged on the downstream side of the packaging piece (2) arranged on the upstream side of the gluing gun (2) ( A package piece detector (5) for detecting the presence or absence of 1a), and a glue detector (6) for detecting the presence or absence of glue (B) on the downstream side of the gluing gun (2),
The package detector (5), the glue detector (6), and the controller (7) electrically connected to the gluing gun (2) are provided,
The control unit (7) determines whether the packaging piece (1a) is in the variable speed movement area or the constant speed movement area according to the moving speed of the packaging piece (1a). (7a), and a dot-punching circuit (7b) that intermittently outputs a gluing signal to the gluing gun (2) at every set interval each time a gear-shift determination signal is input from the gear-shift constant-speed switching circuit (7a). A line striking circuit (7c) for continuously outputting a sizing signal to the gluing gun (2) for a set time each time a constant speed judgment signal is input from the shift constant speed switching circuit (7a); When the determination signal input from the switching circuit (7a) is in the speed change region, the detection signal input from the glue detector (6) is differentiated to output a one-shot pulse signal when rising from a set level. , In the constant speed area, the detection signal input from the glue detector (6) is differentiated to obtain the set level. Select circuit (7l) that outputs a continuous signal from the time of rising to the time of falling, and compare the output signal from this selection circuit (7l) with the set value for each speed change area or constant speed area. A glue detection control device comprising: a pass / fail determination circuit (7p) for determining whether the device is normal or abnormal.