JP2891089B2 - Glue inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sizing inspection apparatus for inspecting adhesion of a paste discharged from a paste discharge nozzle to an object, and more particularly to a sizing inspection apparatus with improved inspection accuracy.

[0002]

2. Description of the Related Art In a box making machine (sack machine), a collating machine (collator), and the like, gluing is performed using an applicator nozzle (glue discharge nozzle) in a gluing process. That is, an inspection is performed to determine whether glue is attached to the gluing target object by the applicator nozzle.

[0003] As this gluing inspection method, there is used a capacitance type in which two electrodes are provided with a glued object interposed therebetween and a change in the capacitance between the electrodes depending on the presence or absence of the glue is used. I was Further, an optical method of coloring the paste and detecting the presence or absence of the paste with reflected light has been used. Another method is to insert a carton with glue between the transmitting and receiving plates, transmit and receive high-frequency waves between both plates, and detect the amount of glue adhesion from the high-frequency attenuation at the receiving electrode. It is disclosed in Japanese Unexamined Patent Publication No. 60-99641.

[0004]

In the case of this capacitance system, two electrodes are provided opposite to each other with a glued object interposed therebetween, and either of the electrodes faces the glued surface. I have. For this reason, glue may adhere to the electrode surface facing the glued surface. However, if glue adheres to the electrode, the variation in the measured value of the capacitance changes significantly, and measurement becomes impossible. In addition, the measured value fluctuated due to humidity, and it was difficult to perform stable glue detection. In addition, the optical method required coloring the paste. Further, in the case of a method for detecting a change in the reception voltage caused by the glue discharged between the transmitting and receiving electrodes as in the technique disclosed in Japanese Patent Application Laid-Open No. 60-99641, the glue target is placed between the two electrodes. Since the space is passed between the electrodes, it is difficult to increase the glue detection sensitivity.

The applicant of the present invention has previously filed Japanese Patent Application No. 4-152512.
Thus, the applicator nozzle is used as one electrode, and another electrode is provided so as to sandwich the inspection object. However, in this method, when the object is large and a plurality of applicator nozzles and inspection devices are arranged, the object A large space is required on the opposite side of the electrode, and every time the position of the applicator nozzle is changed, the corresponding electrode position must be adjusted, and when there is no object, the glue falls on the electrode and adheres There are drawbacks. Accordingly, the present applicant has filed Japanese Patent Application No. 5-0562.
35, an electrode is provided on the same side of the object as the applicator nozzle, and a high frequency is transmitted and received between the applicator nozzle and the electrode. In this case, the difference in the signal level of the receiving electrode between when the glue is present under the applicator nozzle or on the object and when it is not is small. It has been difficult to discriminate between a signal change caused by changing the position of a metal object and a signal change caused by the presence or absence of glue.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a glue inspection apparatus capable of accurately obtaining a glue detection signal by canceling a surrounding noise signal as much as possible and mainly extracting a signal from glue. The purpose is to provide.

[0007]

According to a first aspect of the present invention, there is provided a conductive nozzle for discharging a paste,
A high-frequency generation unit connected to the discharge nozzle, and a high-frequency generator configured to receive a high-frequency wave from the paste discharged from the discharge nozzle, which is disposed on the same side as the discharge nozzle with respect to the gluing target moving with respect to the discharge nozzle. A second electrode disposed in the vicinity of the first electrode and at a position where the amount of high-frequency reception from the paste discharged from the discharge nozzle is smaller than that of the first electrode;
An electrode, a high-frequency detector connected to the first electrode and the second electrode, and a glue for the gluing target based on a difference between a detected value of the first electrode and a detected value of the second electrode of the high-frequency detector. And a glue detecting unit for detecting the adhesion.

According to a second aspect of the present invention, there is provided a conductive discharge nozzle for discharging glue, a high-frequency generator connected to the discharge nozzle, and a discharge nozzle for a glue moving object with respect to the discharge nozzle. A first electrode disposed on the same side as the first electrode for receiving a high frequency from glue discharged from the discharge nozzle;
A second electrode disposed near the electrode and at a position where the amount of high-frequency reception from the paste discharged from the discharge nozzle is smaller than that of the first electrode; and a second electrode connected to the first electrode and the second electrode. A high-frequency detector, and a bias connected to the high-frequency detector so that the first signal from the first electrode and the second signal from the second electrode in a state in which no glue is discharged have substantially the same value. And an adjustment unit for adjusting the gain of the first signal and the second signal connected to the adjustment unit.
And a glue detecting unit for detecting glue adhesion of the gluing target object from a difference from a signal.

According to a third aspect of the present invention, there is provided a conductive nozzle for discharging glue, a high-frequency generator connected to the discharge nozzle, and a discharge nozzle opposed to the discharge nozzle with a gluing target moving with respect to the discharge nozzle. And a second electrode provided in the vicinity of the first electrode and arranged at a position where the amount of high-frequency reception from the paste discharged from the discharge nozzle is smaller than that of the first electrode. A high-frequency detection unit connected to the second electrode and the first electrode; a high-frequency detection unit connected to the high-frequency detection unit;
An adjusting unit that sets a bias or adjusts a gain such that a first signal from the first electrode and a second signal from the second electrode in a state in which glue is not discharged have substantially the same value; A glue detection unit connected to the adjustment unit and configured to detect glue adhesion of the gluing target object based on a difference between the first signal and the second signal.

According to a fourth aspect of the present invention, the second electrode is disposed at a position where the amount of high-frequency reception received by the first electrode from the discharge nozzle in a state where paste is not discharged is received from the discharge nozzle. It was done.

[0011]

According to a fifth aspect of the present invention, there is provided a conductive discharge nozzle for discharging a paste, and a discharge target which is disposed on the same side as the discharge nozzle with respect to a gluing target moving with respect to the discharge nozzle. A first electrode provided opposite to the glue;
A high-frequency generator connected to the first electrode, a second electrode provided near the discharge nozzle, a high-frequency detector connected to the second electrode and the discharge nozzle, and a connection to the high-frequency detector An adjusting unit that sets a bias or adjusts a gain so that the first signal from the ejection nozzle in a state where the glue is not ejected and the second signal from the second electrode have substantially the same value; A glue detecting unit connected to an adjusting unit for detecting glue adhesion of the gluing target object from a difference between the first signal and the second signal, wherein the second electrode is
The height received from the first electrode without discharging the glue
Position where the amount of reception greater than the amount of frequency reception from the first electrode
It is arranged in.

According to a sixth aspect of the present invention, there is provided a conductive discharge nozzle for discharging glue, a first electrode provided opposite to the discharge nozzle with a gluing target moving with respect to the discharge nozzle, A high-frequency generator connected to the first electrode, a second electrode provided near the discharge nozzle, a high-frequency detector connected to the second electrode and the discharge nozzle, and a connection to the high-frequency detector An adjusting unit that sets a bias or adjusts a gain so that the first signal from the ejection nozzle in a state where the glue is not ejected and the second signal from the second electrode have substantially the same value; and a glue detector for detecting a connected to the adjustment unit glue attachment of said gluing object from between the first signal and the second signal, the second electrode, said discharge nozzle
Receiving from the first electrode while the paste is not discharging the glue.
Receiving from the first electrode a receiving amount larger than the high-frequency receiving amount
It is arranged at the position.

[0014]

[0015]

[Advantage] The glue contains several tens of percent of water and exhibits conductivity. In the first invention, the discharge nozzle and the discharged paste serve as a transmitting electrode, and the first electrode serves as a receiving electrode. The second electrode receives less high frequency from the discharged paste than the first electrode. Noise generated due to the installation of a surrounding metal object or changes in temperature and humidity is input to the first electrode and the second electrode in substantially the same manner, so that the detection value of the first electrode of the high-frequency detector and the second electrode Most of the noise is removed by calculating the difference from the detection value of the first electrode, and the first electrode receives more high frequency from the glue than the second electrode, so that a glued signal indicating the presence of the glue can be obtained. it can.

In the second invention, the discharge nozzle and the paste to be discharged serve as a transmitting electrode, and the first electrode serves as a receiving electrode. Second
The electrode receives less high-frequency from the discharged paste than the first electrode. The first electrode and the second electrode receive a high frequency from the discharge nozzle, and the received amount is larger than the received amount from the discharged paste. Since the adjustment unit adjusts the bias or adjusts the gain so that the first signal from the first electrode and the second signal from the second electrode have substantially the same value in a state in which the glue is not discharged, the first The signal and the high-frequency reception signal from the ejection nozzle included in the second signal have substantially the same value. Furthermore, since the first signal contains more high-frequency reception signals received from the glue than the second signal, the difference between the first signal and the second signal is calculated, so that the difference between the first signal and the second signal is obtained. The high frequency reception signal from the ejection nozzle which occupies a large proportion is almost removed, and a glue signal indicating the presence of glue can be obtained with high accuracy.

In the second invention, the first electrode is provided on the discharge nozzle side with respect to the gluing target, whereas in the third invention, the first electrode is disposed opposite to the discharge nozzle with the gluing target interposed therebetween. However, the effect on the gluing signal is almost the same as in the second invention.

In the fourth aspect, the second electrode receives a higher frequency from the discharge nozzle than the first electrode, so that the first signal from the first electrode and the second signal from the first electrode in a state where the glue is not discharged are received.
The first signal from the first electrode is bias-set or gain-adjusted by the adjustment unit so that the second signal from the electrode becomes substantially the same, and the first signal is increased. As a result, when the glue is being discharged, the high-frequency reception signal from the glue included in the first signal is also increased, so that the difference between the first signal from the first electrode and the second signal from the second electrode also increases. The detection accuracy of the glued signal is improved.

[0019]

In the fifth invention, the first electrode serves as a transmitting electrode,
The glue discharged from the discharge nozzle becomes the receiving electrode. The second electrode is provided near the discharge nozzle and receives a high frequency from the first electrode. The discharge nozzle also receives a high frequency from the first electrode. The discharge nozzle and the second electrode receive a high frequency from the first electrode, and the reception amount of each is greater than the high frequency reception amount received from the first electrode via the paste discharged by the discharge nozzle. In a state where the glue is not discharged by the adjusting unit, the bias setting is gain-adjusted so that the first signal from the discharge nozzle and the second signal from the second electrode have substantially the same value. And the high frequency reception signal from the first electrode included in the second signal have substantially the same value. Further, since the first signal includes a high-frequency reception signal received via the glue, the second signal does not include a signal received via the glue, and therefore, a difference between the first signal and the second signal is obtained. By
The high-frequency reception signal from the first electrode, which accounts for a large proportion of the first signal, is almost removed, and a glued signal received via the glue can be obtained with high accuracy. Further, the second electrode
Receives more high frequency from the first electrode than the discharge nozzle
Therefore, in the state where the glue is not discharged, the
The first signal and the second signal from the second electrode are substantially the same.
The first signal from the discharge nozzle is bias set by the adjustment unit,
Or, it is increased by adjusting the gain. This discharges the glue
High-frequency reception signal that the discharge nozzle receives from the glue when
Is increased, the first signal and the second signal from the discharge nozzle are increased.
The difference of the second signal from the pole also increases, and the glued signal is detected.
The accuracy is improved.

In the fifth invention, the first electrode is provided on the discharge nozzle side with respect to the gluing target, whereas in the sixth invention, the first electrode is provided opposite to the discharge nozzle with the gluing target interposed therebetween. However, the effect on the glue signal is almost the same as that of the fifth invention.

[0022]

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the first embodiment of the present invention. In the first embodiment, the first electrode and the second electrode are arranged on the applicator nozzle side with respect to the object to be glued,
The applicator nozzle is on the transmitting side, and the first electrode is on the receiving side. The applicator nozzle 1 receives the supply of the glue from the glue supply device 5, and transfers the glue target 7 in the direction of the arrow.
Discharge the paste. The applicator nozzle 1 is opened and closed by a needle 2 to discharge and shut off the glue. The needle 2 is pressed by the nozzle by the spring 4 to close the nozzle. However, when the coil 3 wound around the needle 2 is energized by the gluing controller 6, the needle 2
And discharges the glue from the gap between the nozzle and the needle 2. In the vicinity of the applicator nozzle 1, a sizing target detection sensor 8 for detecting the presence or absence of the sizing target 7 is provided, and the signal from the sensor 8 causes the sizing target 7 to move the lower part of the applicator nozzle 1. The gluing controller 6 energizes the coil 3 to pull up the needle 2 for a desired time during the passage, discharges the glue 9 from the nozzle, and attaches the glue 9 to the gluing target 7. That is, when the gluing controller 6 receives the detection signal of the gluing target detection sensor 8, the coil 3 is energized to open the nozzle for a time determined by the moving speed of the gluing target 7 and the determined gluing length. .
The energization signal J to the coil 3 is supplied to a glue detection / output circuit
5 is output.

The electrode unit 10 has a first electrode 11 and a second electrode 12, and the first electrode 11 is
(Transmitting electrode). The second electrode 12 is arranged to receive a signal from the glue 9 less (preferably not) than the first electrode. The high-frequency oscillation circuit 13 oscillates at a constant amplitude (for example, 30 Vp-p) and a constant frequency (for example, 500 KHz), amplifies its output with a power amplification circuit 14, and applies the output to the applicator nozzle 1. The glue detection / output circuit 15 detects whether the glue 9 has adhered to the gluing target object 7 by taking the difference between the high frequencies received by the first electrode 11 and the second electrode 12, and outputs the result.

FIG. 2 is a view showing a first example of the electrode unit 10 used in the first embodiment. The first electrode 11 and the second electrode 12 are sealed with a grounded conductor case 18,
The inside of the case 18 is filled with an insulating material 19. The case 18 is attached to the nozzle tip 16 of the applicator nozzle 1 with an insulating material 19. The first electrode 11 and the second electrode 12 are connected to a glue detection / output circuit 15 by a conductor 17. The first electrode 11 and the second electrode 12 are connected to the nozzle tip 16.
And receives a high frequency transmitted from the nozzle tip 16. The second electrode 12 has a large reception amount since the area of the nozzle tip 16 facing the first electrode 11 is large. The first electrode 11 receives a large amount of high-frequency waves transmitted from the glue 9, but the second electrode 12 is away from the glue 9,
Is small.

FIG. 3 shows a second example of the electrode unit 10 used in the first embodiment. The first electrode 11 and the second electrode 12 are arranged symmetrically with the first electrode 11 being downstream with respect to the nozzle tip 16 in the traveling direction of the gluing target 7, and the electrode surfaces of both electrodes are aligned with the gluing target 7. They are arranged facing each other. Each electrode 1
1 and 12 are sealed by a grounded conductor case 18, and the case 18 is filled with an insulator 19.
At 9 is attached to the nozzle tip 16. In the present electrode unit 10, the amount of high-frequency reception from the nozzle tip 16 is almost the same for both electrodes 11 and 12, and the amount of high-frequency reception from the paste 9 is large for the first electrode 11 and small for the second electrode 12. .

FIGS. 4 and 5 are diagrams showing details of the glue detection / output circuit 15. FIG. The high frequency received by the first electrode 11 and the second electrode 12 is amplified by the voltage amplifier circuits 21a and 21b, and the noise is suppressed by the band-pass filter circuits 22a and 22b to improve the S / N ratio. Detection circuits 23a, 23b
A signal indicating the presence of the glue 9 is extracted, and high-frequency components are removed by the low-pass filter circuits 24a and 24b.

The gain adjustment circuit 25 is composed of an amplifier.
Low-pass filter circuit 2 when glue 9 is not being discharged
This is a circuit for adjusting the output levels of 4a and 24b. FIG.
The first electrode 11 and the second electrode 11 in the electrode unit 10
Since the reception level of the electrode 12 from the nozzle tip 16 is higher at the second electrode 12, the output of the first electrode 11 is amplified to equalize the output of both. In the electrode unit 10 shown in FIG. 3, the first electrode 11 and the second electrode 12 receive almost the same amount of high frequency from the nozzle tip 16, but there is some imbalance, so the output of the first electrode 11 is adjusted. To make the output of both the same. The differential amplifier circuit 26
The difference between the output of the electrode 11 and the output of the second electrode 12 is obtained, whereby the amount of reception that the electrodes 11 and 12 receive from the nozzle tip 16 can be substantially eliminated. The output B of the first electrode 11 becomes B 'from the voltage amplifying circuit 21a via the gain adjusting circuit 25, and the output C of the second electrode 12 becomes C' from the voltage amplifying circuit 21b via the low-pass filter circuit 24b. The signal D is amplified by K times and becomes a signal D. The signal D substantially represents a signal received from the glue 9 and detects that the glue 9 is attached to the gluing target 7. In the case of the electrode unit 10 shown in FIG. 2, the reception signal from the paste discharged by the gain adjustment circuit 25 also increases, so that the detection accuracy of the paste signal is improved. The gain adjustment circuit 25 is an amplifier, but may be a bias setting device.

The bias circuit 27 outputs the signal D to the display circuit 32.
, The bias value setting circuit 28 applies a bias voltage so as to be displayed at an appropriate position on the screen.
Sets the bias value E. The comparison circuit 29 compares the value of F obtained by adding E to D displayed on the display circuit 32 with a reference value G generated by the reference voltage generation circuit 30. If the value exceeds the value of G, the output I of the comparison circuit 29 is compared. Is set to H to indicate that gluing is performed, and when not exceeded, set to L to indicate that gluing was not performed. The determination circuit 31 compares the energization signal J to the coil 3 from the glue controller 6 shown in FIG.
Then, it is determined whether or not the glue is normally discharged by comparing the signals I of No. 9 with each other. When the energization signal J to the coil 3 is L, energization of the coil 3 is not performed, and when the energization signal is H, it is normal when I and J have the same sign, such as H, H or L, L. Yes, I is H and J is L or I is L and J is H
If they are different, it is abnormal. For example, J is H
When the glue 9 is not detected even though the nozzle is open, an abnormal state such as the glue 9 is not normally supplied from the glue supply device 5 has occurred, and the determination result is displayed as a signal M. In addition to the display on the circuit 33, the output circuit 34
An instruction to stop the movement of the gluing target 7 is output.

FIG. 6 is a diagram for explaining the operation of the gain adjustment circuit 25 and the differential amplifier circuit 26 shown in FIG. The output B of the first electrode 11 and the output C of the second electrode 12 are adjusted by the gain adjustment circuit 25 so as to be substantially the same when the glue 9 is not ejected as described with reference to FIG. The input values B 'and C' to the amplifying circuit 26 become Va when the paste 9 is not ejected. When the paste 9 is discharged, the first electrode 11
Of the output C 'of the second electrode 12 rises by ΔVb (ΔVc≪ΔVb) and is almost negligible. Therefore, the output D of the differential amplifier circuit 26 represents a value generated by the discharge of the paste 9.

FIG. 7 is a diagram showing the waveform of each signal in FIGS. A to M correspond to A to M in FIGS. A is a high-frequency pulse having a constant amplitude at the output of the power amplifier circuit 14, and B has a large amplitude when the glue 9 is discharged at the output of the first electrode 11. C is the output of the second electrode 12 and the amplitude is slightly increased due to the discharge of the paste 9. B 'is the output of the gain adjustment circuit 25, and C' is the low-pass filter circuit 24b.
, D is the output of the differential amplifier circuit 26 and has the waveform described in FIG.

F is the value obtained by adding E to the value of the curve D.
Are appropriately displayed on the display circuit 32. G represents a reference value. If the value of F is equal to or more than G, it indicates that the glue has been discharged normally. As for I, the value of F exceeding G at the output of the comparison circuit 29 is represented as H, and the value of not exceeding L is represented as L. J is the output of the gluing controller 6 shown in FIG.
Indicates the energization of the coil 3, and L indicates the period during which no current is applied. The energization period indicates that the glue 9 is being discharged from the applicator nozzle 1. M is the output of the decision circuit 31 and I and J
Shows the value obtained by taking the exclusive OR (exclusive OR) of That is, if I and J have the same sign, M will be L and indicate normal, and if they have different signs, it will be H and indicate abnormal. For example, at point a, I becomes L and indicates a state in which gluing is stopped, while J indicates H and the state in which the applicator nozzle 1 is opened to discharge glue. In this case, the glue supply device 5
It is determined that an abnormal situation has occurred, such as the glue 9 being no longer supplied from the printer, the abnormality is displayed on the display circuit 33, and an instruction to stop the gluing target 7 is output from the output circuit 34.

In the above-described embodiment, the gain adjustment circuit of FIG. 4 is used to adjust the output signals B 'and C' when there is no glue, but this gain adjustment is not always necessary. By using the signal difference between the two receiving electrodes, a signal that is more resistant to noise than the signal of one receiving electrode can be obtained. Although bias adjustment may be performed instead of the gain adjustment circuit, this bias adjustment is not always necessary.

Next, a second embodiment will be described. In the second embodiment, the applicator nozzle 1 and the first electrode 11 are opposed to each other with the gluing target 7 interposed therebetween.
The electrode 11 is on the receiving side. FIG. 8 shows the configuration of the second embodiment, and the same symbols as those in FIG. 1 represent the same meanings. First
A high frequency is transmitted from the applicator nozzle 1 and the glue 9 to the electrode 11 through the gluing target 7. Second electrode 12
Is arranged on the applicator nozzle 1 side with respect to the gluing target 7, and when the glue 9 is not being discharged, a reception amount larger than the high frequency reception amount received by the first electrode 11 is received from the applicator nozzle 1. It is arranged in a suitable position. Except for the change in the arrangement of the first electrode 11 and the second electrode 12, the configuration is the same as that of the first embodiment using the first example of the electrode unit 10 shown in FIG.

Next, a third embodiment will be described. In the third embodiment, the first electrode 11 and the second electrode 12 are on the same side as the applicator nozzle 1 with respect to the gluing target 7, the first electrode 11 is on the transmitting side, and the applicator nozzle 1 is on the receiving side. It is.
FIG. 9 is a block diagram showing the overall configuration of the third embodiment. 1 have the same meanings. The power amplification circuit 14 and the first electrode 11 are connected, and the applicator nozzle 1
This is the same as FIG. 1 except that the glue detection and output circuit 15 is connected.

FIG. 10 is a view showing a first example of the electrode unit 10 used in the third embodiment. The first electrode 11 is connected to a power amplifier 14 by a conductor 17, and the second electrode 12 is connected to a glue detection / output circuit 15 by a conductor 17. The first electrode 11 and the second electrode 12 are sealed by a grounded conductive case 18, and the inside of the case 18 is filled with an insulating material 19. Nozzle tip 16 and first electrode 11
The case 18 of the second electrode 12 is attached to the case 18 of the first electrode 11 via the insulating material 19. First electrode 11
The electrode surfaces of the second electrode 12 and the second electrode 12 are vertical, and the high frequency wave transmitted from the first electrode 11 is received by the nozzle tip 16 and the second electrode 12. Nozzle tip 16 without discharging glue 9
The first electrode 11 and the second electrode 12 are arranged with respect to the nozzle tip 16 such that the high-frequency reception amount of the first electrode 11 is smaller than the high-frequency reception amount of the second electrode 12.

FIG. 11 is a view showing a second example of the electrode unit 10 used in the third embodiment. The difference from the first example of FIG. 10 is that the electrode surfaces of the first electrode 11 and the second electrode 12 are horizontal and opposed to the object 7 to be glued.
Same as the example. The operation of the third embodiment is shown in FIGS.
The operation of the first embodiment using the first example of the electrode unit 10 described in FIGS. However, the first of FIG.
The electrode 11 is changed to the applicator nozzle 1.

Next, a fourth embodiment will be described. In the fourth embodiment, the applicator nozzle 1 and the first electrode 11 are opposed to each other with the gluing target 7 interposed therebetween, and the first electrode 11 is on the transmitting side and the applicator nozzle 1 is on the receiving side. FIG. 12 shows the configuration of the fourth embodiment, and the same reference numerals as those in FIG. 1 represent the same meanings. High frequency is transmitted from the first electrode 11 and received by the glue 9 and the applicator nozzle 1 via the gluing target 7. Second electrode 12
Is disposed to face the first electrode 11 with the gluing target 7 interposed therebetween. The second electrode 12 is arranged at a position where the applicator nozzle 1 receives from the first electrode 11 a reception amount larger than the high-frequency reception amount that the applicator nozzle 1 receives from the first electrode 11 in a state where the glue 9 is not discharged. The operation of the fourth embodiment is almost the same as that of the third embodiment.

[0039]

As is apparent from the above description, according to the present invention, the second electrode is provided on the high frequency receiving side so that noise is received almost in the same manner as the receiving electrode, and the difference between the output of the receiving electrode and the output of the second electrode is obtained. Noise is reduced by removing the noise, so even if noise is generated due to changes in the position of the metal or dielectric placed around the high-frequency detector, or due to temperature or humidity, it is removed and stabilized. A glued signal can be obtained. Further, a second electrode is provided on the high frequency receiving side, and the size of the signal from the receiving electrode (the first electrode or the discharge nozzle) and the magnitude of the signal from the second electrode are substantially the same in a state where the paste is not discharged from the discharge nozzle. Set the bias or adjust the gain at
The difference between the signals from the two electrodes is taken to extract the signal from the paste to be discharged, so that the paste signal can be obtained with high accuracy. The second electrode is set at a position where the amount of high-frequency reception is larger than that of the receiving electrode (ejection nozzle or first electrode) in a state where the ejection nozzle is not ejecting glue. By increasing the signal from the receiving electrode so as to be the same as the signal from the second electrode, the signal from the glue included in the signal from the receiving electrode also increases, so that the glued signal can be obtained accurately. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a first embodiment.

FIG. 2 is a diagram showing a first example of an electrode unit used in the first embodiment.

FIG. 3 is a diagram showing a second example of the electrode unit used in the first embodiment.

FIG. 4 is a detailed diagram of a glue detection / output circuit.

FIG. 5 is a detailed diagram of a glue detection / output circuit.

FIG. 6 is a diagram illustrating operations of a gain adjustment circuit and a differential amplifier circuit.

FIG. 7 is a diagram showing signal waveforms of the respective circuits of FIGS. 1, 4 and 5;

FIG. 8 is a block diagram illustrating a configuration of a second embodiment.

FIG. 9 is a block diagram showing a configuration of a third embodiment.

FIG. 10 is a diagram showing a first example of an electrode unit used in the third embodiment.

FIG. 11 is a view showing a second example of the electrode unit used in the third embodiment.

FIG. 12 is a block diagram showing a configuration of a fourth embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 applicator nozzle (discharge nozzle) 5 glue supply device 6 glue controller 7 glue target 9 glue 10 electrode unit 11 first electrode 12 second electrode 13 high frequency oscillation circuit 14 power amplifier circuit 15 glue detection / output circuit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Munehiro Ishida 2951-4 Ishikawa-cho, Hachioji-shi, Tokyo Nireco Co., Ltd. (56) References JP-A-5-340892 (JP, A) JP-A-6-273353 (JP, A) JP-A-5-248888 (JP, A) JP-A-5-134054 (JP, A) Japanese Utility Model Application Laid-open No. 55-101350 (JP, U) JP-B-2-57017 (JP, B2) ( 58) Fields surveyed (Int. Cl. ⁶ , DB name) G01N 22/00-22/04 G01N 27/72-27/90

Claims (6)

(57) [Claims] 1. A conductive discharge nozzle for discharging glue, a high-frequency generating unit connected to the discharge nozzle, and a discharge nozzle arranged on the same side as the discharge nozzle with respect to a gluing target moving with respect to the discharge nozzle. A first electrode for receiving a high frequency from the paste discharged from the discharge nozzle, and a high-frequency reception amount from the paste discharged from the discharge nozzle near the first electrode and the discharge nozzle becomes smaller than that of the first electrode A second electrode disposed at a position, a high-frequency detector connected to the first electrode and the second electrode, and a difference between a detected value of the first electrode and a detected value of the second electrode of the high-frequency detector. A glue detecting unit for detecting a glue adhesion of the glue target. 2. A conductive discharge nozzle for discharging glue, a high-frequency generator connected to the discharge nozzle, and a discharge nozzle disposed on the same side as the discharge nozzle with respect to a gluing target moving with respect to the discharge nozzle. A first electrode for receiving a high frequency from the paste discharged from the discharge nozzle, and a high-frequency reception amount from the paste discharged from the discharge nozzle near the first electrode and the discharge nozzle becomes smaller than that of the first electrode A second electrode disposed at a position, a high-frequency detection unit connected to the first electrode and the second electrode, and a high-frequency detection unit connected to the high-frequency detection unit and from the first electrode in a state of not discharging glue. The first signal and the second signal
An adjusting section for setting a bias or adjusting a gain so that the second signal from the electrode has substantially the same value; and an adjusting section connected to the adjusting section, wherein the glue is obtained from a difference between the first signal and the second signal. A glue inspection device, comprising: a glue detection unit that detects glue adherence to an object to be glued. 3. A conductive nozzle for discharging glue, a high-frequency generator connected to the discharge nozzle, and an opposing nozzle provided with a gluing target moving with respect to the discharge nozzle. A first electrode and a second electrode provided near the first electrode and arranged at a position where the amount of high-frequency reception from the paste discharged from the discharge nozzle is smaller than that of the first electrode.
An electrode, a high-frequency detection unit connected to the second electrode and the first electrode, a first signal from the first electrode connected to the high-frequency detection unit and not discharging the glue, and the second signal; An adjusting section for setting a bias or adjusting a gain so that the second signal from the electrode has substantially the same value; and an adjusting section connected to the adjusting section, wherein the glue is obtained from a difference between the first signal and the second signal. A glue inspection device, comprising: a glue detection unit that detects glue adherence to an object to be glued. 4. The method according to claim 1, wherein the second electrode is arranged at a position for receiving, from the discharge nozzle, a reception amount larger than a high-frequency reception amount received by the first electrode from the discharge nozzle in a state in which the paste is not discharged. The gluing inspection device according to claim 2 or 3, wherein 5. A conductive discharge nozzle for discharging glue, and is disposed on the same side as the discharge nozzle with respect to an object to be glued moving with respect to the discharge nozzle, and faces the glue discharged from the discharge nozzle. A first electrode provided, a high-frequency generator connected to the first electrode, a second electrode provided in the vicinity of the discharge nozzle, and a high-frequency detector connected to the second electrode and the discharge nozzle And a bias setting or gain so that the first signal from the ejection nozzle and the second signal from the second electrode, which are connected to the high-frequency detection unit and do not discharge glue, have substantially the same value. And a glue detecting unit connected to the adjusting unit and detecting glue adhesion of the gluing target object based on a difference between the first signal and the second signal, wherein the second electrode is The first nozzle in a state where the discharge nozzle is not discharging glue. A glue inspection device, wherein the glue inspection device is arranged at a position where a reception amount larger than a high-frequency reception amount received from a pole is received from a first electrode. 6. A conductive discharge nozzle for discharging glue, a first electrode provided opposite to the discharge nozzle with a gluing target moving with respect to the discharge nozzle, and a first electrode provided on the first electrode. A connected high-frequency generator, a second electrode provided in the vicinity of the discharge nozzle, a high-frequency detector connected to the second electrode and the discharge nozzle, and connected to the high-frequency detector to discharge glue. An adjustment unit that sets a bias or adjusts a gain such that the first signal from the ejection nozzle and the second signal from the second electrode that are not in the same state have substantially the same value;
A glue detecting unit connected to the adjusting unit for detecting glue adhesion of the gluing target object from a difference between the first signal and the second signal, wherein the second electrode discharges the glue by the discharge nozzle; A glue inspection device, wherein the glue inspection device is arranged at a position where a reception amount larger than a high-frequency reception amount received from the first electrode is received from the first electrode in a state where the high-frequency reception is not performed.